{"title":"Solar Filters","description":"\u003c!-- Telescope Depot - Solar Filters (SPLIT v1, Lunt). 9 active products. Handle: solar-filters. ID: 639777767535 --\u003e\n\n\u003c!-- TOP HALF --\u003e\n\u003cdiv style=\"font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;max-width:1200px;margin:18px auto 8px;padding:0 16px;color:#030B1C;line-height:1.6;box-sizing:border-box;\"\u003e\n  \u003cdiv style=\"background:#F5F7FA;border:1px solid #ebeef3;border-left:4px solid #030B1C;border-radius:8px;padding:22px 26px;display:flex;flex-wrap:wrap;gap:24px;align-items:center;justify-content:space-between;box-sizing:border-box;\"\u003e\n    \u003cdiv style=\"flex:1 1 360px;min-width:0;\"\u003e\n      \u003cspan style=\"display:inline-block;background:rgba(114,148,186,0.15);color:#030B1C;font-size:11px;font-weight:700;letter-spacing:1px;text-transform:uppercase;padding:4px 10px;border-radius:3px;margin-bottom:10px;\"\u003eSolar Filters\u003c\/span\u003e\n      \u003ch2 style=\"font-size:22px;font-weight:700;margin:0 0 8px;line-height:1.25;color:#030B1C;\"\u003eSolar Filters For Sale\u003c\/h2\u003e\n      \u003cp style=\"font-size:14.5px;line-height:1.55;color:#555;margin:0 0 14px;\"\u003e9 hydrogen-alpha etalon sets, blocking filters, calcium K modules and white light wedges from Lunt Solar Systems, from $26.99 to $6,995.99. Turn a telescope you already own into a safe solar instrument. Free Shipping.\u003c\/p\u003e\n      \u003cdiv style=\"display:flex;flex-wrap:wrap;gap:8px;\"\u003e\n        \u003ca href=\"#pps-sf-compare\" class=\"pps-top-btn pps-top-btn-primary\" style=\"display:inline-block;background:#030B1C;color:#fff;border:1px solid #030B1C;padding:9px 16px;border-radius:6px;font-size:13px;font-weight:700;text-decoration:none;letter-spacing:0.2px;line-height:1;transition:background 0.15s ease,border-color 0.15s ease,transform 0.15s ease;\"\u003eCompare All 9 Filters ↓\u003c\/a\u003e\n        \u003ca href=\"\/pages\/contact-us\" class=\"pps-top-btn pps-top-btn-outline\" style=\"display:inline-block;background:#fff;color:#030B1C;border:1px solid #030B1C;padding:9px 16px;border-radius:6px;font-size:13px;font-weight:600;text-decoration:none;letter-spacing:0.2px;line-height:1;transition:background 0.15s ease,color 0.15s ease,transform 0.15s ease;\"\u003eGet Expert Advice\u003c\/a\u003e\n        \u003ca href=\"tel:8555010541\" class=\"pps-top-btn pps-top-btn-outline\" style=\"display:inline-block;background:#fff;color:#030B1C;border:1px solid #030B1C;padding:9px 16px;border-radius:6px;font-size:13px;font-weight:600;text-decoration:none;letter-spacing:0.2px;line-height:1;transition:background 0.15s ease,color 0.15s ease,transform 0.15s ease;\"\u003eCall (855) 501-0541\u003c\/a\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"display:flex;gap:22px;flex-wrap:wrap;justify-content:center;flex-shrink:1;width:100%;max-width:100%;\"\u003e\n      \u003cdiv style=\"text-align:center;padding:0 6px;flex:0 1 auto;min-width:90px;\"\u003e\n        \u003cstrong style=\"display:block;font-size:22px;font-weight:800;color:#030B1C;line-height:1;margin-bottom:4px;\"\u003e9\u003c\/strong\u003e\u003cspan style=\"font-size:11px;font-weight:600;letter-spacing:0.5px;text-transform:uppercase;color:#555;\"\u003eSolar Filters\u003c\/span\u003e\n      \u003c\/div\u003e\n      \u003cdiv style=\"text-align:center;padding:0 6px;flex:0 1 auto;min-width:90px;\"\u003e\n        \u003cstrong style=\"display:block;font-size:22px;font-weight:800;color:#030B1C;line-height:1;margin-bottom:4px;\"\u003e50-100mm\u003c\/strong\u003e\u003cspan style=\"font-size:11px;font-weight:600;letter-spacing:0.5px;text-transform:uppercase;color:#555;\"\u003eEtalon Apertures\u003c\/span\u003e\n      \u003c\/div\u003e\n      \u003cdiv style=\"text-align:center;padding:0 6px;flex:0 1 auto;min-width:90px;\"\u003e\n        \u003cstrong style=\"display:block;font-size:22px;font-weight:800;color:#030B1C;line-height:1;margin-bottom:4px;\"\u003eFREE\u003c\/strong\u003e\u003cspan style=\"font-size:11px;font-weight:600;letter-spacing:0.5px;text-transform:uppercase;color:#555;\"\u003eFree Shipping\u003c\/span\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003c!--PP_SPLIT--\u003e\n\n\u003cstyle\u003e\n  .pps-sf { --pps-accent:#030B1C; 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}\n    .pps-sf-cap-grid { grid-template-columns:repeat(2,1fr); }\n    .pps-sf-types-grid { grid-template-columns:1fr; }\n  }\n  @media (max-width:768px) {\n    .pps-sf { padding:0 8px; }\n    .pps-sf-hero { grid-template-columns:1fr; gap:22px; padding:24px 0; }\n    .pps-sf-hero h2 { font-size:24px; }\n    .pps-sf-hero img { transform:none; margin-top:0; }\n    .pps-sf-why { grid-template-columns:1fr; gap:12px; }\n    .pps-sf-callout { grid-template-columns:1fr; text-align:center; }\n    .pps-sf-callout-badge { margin:0 auto; }\n    .pps-sf-cap { padding:22px; }\n    .pps-sf-cap-grid { grid-template-columns:1fr; }\n    .pps-sf-featured-grid-3 { grid-template-columns:1fr; gap:16px; }\n    .pps-sf-peers-grid { grid-template-columns:1fr; }\n  }\n\u003c\/style\u003e\n\n\u003cdiv class=\"pps-sf\"\u003e\n\n  \u003csection class=\"pps-sf-hero\"\u003e\n    \u003cdiv\u003e\n      \u003cspan class=\"pps-sf-eyebrow\"\u003eSolar Filters\u003c\/span\u003e\n      \u003ch2\u003ePut the Sun in the Telescope You Already Own\u003c\/h2\u003e\n      \u003cp\u003eA solar filter is not an accessory you bolt on and hope for the best. It is the part of the optical train that decides whether the next hour is one of the great sights in amateur astronomy or a trip to an ophthalmologist. Everything on this page is made by Lunt Solar Systems, who build the filters that go into their own telescopes.\u003c\/p\u003e\n      \u003cp\u003eThere are two honest reasons to buy a filter rather than a dedicated solar telescope. The first is that you already own a good refractor and would rather add capability than duplicate it. The second is that you want a wavelength your solar telescope does not cover, such as calcium K, or you want to double stack what you have. Both are well served here.\u003c\/p\u003e\n      \u003cp\u003eIf neither of those describes you, buy the instrument instead. Our \u003ca href=\"\/collections\/solar-telescopes\"\u003esolar telescopes\u003c\/a\u003e arrive with the filtering engineered in, and for most first time solar observers that is the simpler path.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0717\/7968\/0367\/files\/Double-Stack-Filter-50F-Vertical.png?v=1785527459\" alt=\"Lunt full aperture hydrogen-alpha etalon filter set\" loading=\"lazy\"\u003e\u003c\/div\u003e\n  \u003c\/section\u003e\n\n  \u003csection class=\"pps-sf-callout\"\u003e\n    \u003cdiv class=\"pps-sf-callout-badge\"\u003eREAD\u003cbr\u003eFIRST\u003c\/div\u003e\n    \u003cdiv\u003e\n      \u003ch3\u003eSolar filtering is not a place to improvise\u003c\/h3\u003e\n      \u003cp\u003eNever point a telescope at the Sun without a filter designed for the job and confirmed undamaged. Never use a screw-in filter that threads onto the eyepiece end and calls itself a sun filter. Those sit where the light is already concentrated and they can crack without warning. Every filter here works at the front of the telescope, or as a matched blocking element in a system built around it.\u003c\/p\u003e\n      \u003cp\u003eInspect any solar filter for pinholes, scratches or delamination before every session. If anything looks wrong, do not use it. If you are unsure whether a filter suits your telescope, call \u003ca href=\"tel:8555010541\"\u003e(855) 501-0541\u003c\/a\u003e before you order rather than after.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/section\u003e\n\n  \u003csection class=\"pps-sf-why\"\u003e\n    \u003cdiv class=\"pps-sf-why-card\"\u003e\n      \u003cdiv class=\"pps-sf-why-icon\"\u003e1\u003c\/div\u003e\n      \u003ch3\u003eMade by the telescope builder\u003c\/h3\u003e\n      \u003cp\u003eLunt designs these filters alongside their own solar telescopes, so the etalons, blocking filters and tuning hardware are engineered as one system rather than assembled from parts.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"pps-sf-why-card\"\u003e\n      \u003cdiv class=\"pps-sf-why-icon\"\u003e2\u003c\/div\u003e\n      \u003ch3\u003eFront of the telescope, every time\u003c\/h3\u003e\n      \u003cp\u003eFull aperture etalons and wedges reject the energy before it is concentrated. That is the only architecture we will sell for solar work.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"pps-sf-why-card\"\u003e\n      \u003cdiv class=\"pps-sf-why-icon\"\u003e3\u003c\/div\u003e\n      \u003ch3\u003eFree shipping on all of it\u003c\/h3\u003e\n      \u003cp\u003eFrom a $26.99 polarizer to a $6,995.99 etalon set, shipping is free. No surprise handling charge at the last step of checkout.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"pps-sf-why-card\"\u003e\n      \u003cdiv class=\"pps-sf-why-icon\"\u003e4\u003c\/div\u003e\n      \u003ch3\u003eWe will tell you if it does not fit\u003c\/h3\u003e\n      \u003cp\u003eBlocking filter sizing and tube diameters are easy to get wrong. Tell us your telescope and camera and we will confirm the combination before you spend anything.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/section\u003e\n\n  \u003csection class=\"pps-sf-types\"\u003e\n    \u003ch2\u003eThree kinds of filter, three different jobs\u003c\/h2\u003e\n    \u003cp\u003eAlmost every question we get on this collection comes down to not knowing which of these three groups a product belongs to. Here is the whole range sorted into them.\u003c\/p\u003e\n    \u003cdiv class=\"pps-sf-types-grid\"\u003e\n      \u003cdiv class=\"pps-sf-type-card\"\u003e\n        \u003ch3\u003eFull aperture etalon sets\u003c\/h3\u003e\n        \u003cdiv class=\"pps-sf-type-count\"\u003e3 models · $1,495.99 to $6,995.99\u003c\/div\u003e\n        \u003cp\u003eThe complete conversion. An etalon mounts to the front of your refractor, a blocking filter goes in the focuser, and the result is a working hydrogen-alpha telescope. Choose the set by how much aperture you want to use.\u003c\/p\u003e\n        \u003cul\u003e\n          \u003cli\u003e50mm set, from $1,495.99\u003c\/li\u003e\n          \u003cli\u003e60mm set, from $2,195.99\u003c\/li\u003e\n          \u003cli\u003e100mm set, from $4,895.99\u003c\/li\u003e\n        \u003c\/ul\u003e\n        \u003ca class=\"pps-sf-cap-link\" href=\"#pps-sf-feat-t1\"\u003eSee the sets\u003c\/a\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"pps-sf-type-card\"\u003e\n        \u003ch3\u003eBlocking filters and wavelength modules\u003c\/h3\u003e\n        \u003cdiv class=\"pps-sf-type-count\"\u003e3 models · $395.99 to $4,495.99\u003c\/div\u003e\n        \u003cp\u003eThe pieces that finish or extend a system you already own. Replace a blocking filter to clear a bigger sensor, add calcium K for a different layer of the Sun, or double stack an MT telescope for contrast.\u003c\/p\u003e\n        \u003cul\u003e\n          \u003cli\u003eH-Alpha Blocking Filter, from $395.99\u003c\/li\u003e\n          \u003cli\u003eCalcium K Module, from $895.99\u003c\/li\u003e\n          \u003cli\u003eDouble Stack for MT, from $1,145.99\u003c\/li\u003e\n        \u003c\/ul\u003e\n        \u003ca class=\"pps-sf-cap-link\" href=\"#pps-sf-feat-t2\"\u003eSee the modules\u003c\/a\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"pps-sf-type-card\"\u003e\n        \u003ch3\u003eWhite light and refinement\u003c\/h3\u003e\n        \u003cdiv class=\"pps-sf-type-count\"\u003e3 models · $26.99 to $375.99\u003c\/div\u003e\n        \u003cp\u003eThe affordable end. A white light wedge shows sunspots and granulation on a refractor for a few hundred dollars, and the smaller items make an existing setup more comfortable or slightly sharper.\u003c\/p\u003e\n        \u003cul\u003e\n          \u003cli\u003eWhite Light Solar Wedge, from $275.99\u003c\/li\u003e\n          \u003cli\u003eHigh Resolution Glass Upgrade, from $249.99\u003c\/li\u003e\n          \u003cli\u003ePolarizing Filter Unit, from $26.99\u003c\/li\u003e\n        \u003c\/ul\u003e\n        \u003ca class=\"pps-sf-cap-link\" href=\"#pps-sf-feat-t3\"\u003eSee the rest\u003c\/a\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/section\u003e\n\n  \u003csection id=\"pps-sf-compare\"\u003e\n    \u003ch2\u003eCompare all 9 solar filters\u003c\/h2\u003e\n    \u003cp\u003eEvery filter we stock, sorted by starting price. The Fits column is the single most common reason an order gets returned, so read it before you buy.\u003c\/p\u003e\n    \u003cdiv class=\"pps-sf-table-wrap\"\u003e\n      \u003ctable class=\"pps-sf-table\"\u003e\n        \u003cthead\u003e\n          \u003ctr\u003e\n\u003cth\u003eFilter\u003c\/th\u003e\n\u003cth\u003eWhat it does\u003c\/th\u003e\n\u003cth\u003eFits\u003c\/th\u003e\n\u003cth\u003eOptions\u003c\/th\u003e\n\u003cth\u003eFrom\u003c\/th\u003e\n\u003c\/tr\u003e\n        \u003c\/thead\u003e\n        \u003ctbody\u003e\n        \u003ctr\u003e\n          \u003ctd\u003e\u003ca href=\"\/products\/lunt-polarizing-filter-unit\"\u003e\u003cstrong\u003eLunt Polarizing Filter Unit\u003c\/strong\u003e\u003c\/a\u003e\u003c\/td\u003e\n          \u003ctd\u003eDials down brightness and glare\u003c\/td\u003e\n          \u003ctd\u003eAny 1.25 inch or 2 inch focuser\u003c\/td\u003e\n          \u003ctd\u003e1.25 inch, 2 inch\u003c\/td\u003e\n          \u003ctd\u003e\u003cstrong\u003e$26.99\u003c\/strong\u003e\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003e\u003ca href=\"\/products\/lunt-high-resolution-glass-upgrade\"\u003e\u003cstrong\u003eLunt High Resolution Glass Upgrade\u003c\/strong\u003e\u003c\/a\u003e\u003c\/td\u003e\n          \u003ctd\u003eHigher grade glass for double stack and pressure tuner assemblies\u003c\/td\u003e\n          \u003ctd\u003e80THa and 100THa double stack, SFPT pressure tuners\u003c\/td\u003e\n          \u003ctd\u003e3 models\u003c\/td\u003e\n          \u003ctd\u003e\u003cstrong\u003e$249.99\u003c\/strong\u003e\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003e\u003ca href=\"\/products\/lunt-white-light-solar-wedge\"\u003e\u003cstrong\u003eLunt White Light Solar Wedge\u003c\/strong\u003e\u003c\/a\u003e\u003c\/td\u003e\n          \u003ctd\u003eSafe white light viewing of sunspots and granulation\u003c\/td\u003e\n          \u003ctd\u003eRefractors only, 1.25 inch or 2 inch focuser\u003c\/td\u003e\n          \u003ctd\u003e1.25 inch, 2 inch\u003c\/td\u003e\n          \u003ctd\u003e\u003cstrong\u003e$275.99\u003c\/strong\u003e\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003e\u003ca href=\"\/products\/lunt-h-alpha-blocking-filter\"\u003e\u003cstrong\u003eLunt H-Alpha Blocking Filter\u003c\/strong\u003e\u003c\/a\u003e\u003c\/td\u003e\n          \u003ctd\u003eRejects everything outside the H-alpha line at the focuser\u003c\/td\u003e\n          \u003ctd\u003eEvery Lunt H-alpha etalon system\u003c\/td\u003e\n          \u003ctd\u003e10 models, B600 to B3400\u003c\/td\u003e\n          \u003ctd\u003e\u003cstrong\u003e$395.99\u003c\/strong\u003e\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003e\u003ca href=\"\/products\/lunt-calcium-k-blocking-filter-module\"\u003e\u003cstrong\u003eLunt Calcium K Blocking Filter Module\u003c\/strong\u003e\u003c\/a\u003e\u003c\/td\u003e\n          \u003ctd\u003eOpens the calcium K line for network and plage detail\u003c\/td\u003e\n          \u003ctd\u003eLunt telescopes and CaK ready setups\u003c\/td\u003e\n          \u003ctd\u003e8 models\u003c\/td\u003e\n          \u003ctd\u003e\u003cstrong\u003e$895.99\u003c\/strong\u003e\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003e\u003ca href=\"\/products\/lunt-double-stack-etalon-filter-for-mt-telescopes\"\u003e\u003cstrong\u003eLunt Double Stack Etalon Filter for MT Telescopes\u003c\/strong\u003e\u003c\/a\u003e\u003c\/td\u003e\n          \u003ctd\u003eAdds a second etalon to narrow bandwidth and raise contrast\u003c\/td\u003e\n          \u003ctd\u003eLS60MT, LS100MT, LS130MT and matching THa bodies\u003c\/td\u003e\n          \u003ctd\u003e5 models\u003c\/td\u003e\n          \u003ctd\u003e\u003cstrong\u003e$1,145.99\u003c\/strong\u003e\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003e\u003ca href=\"\/products\/lunt-50mm-full-aperture-h-alpha-etalon-filter-set\"\u003e\u003cstrong\u003eLunt 50mm Full Aperture H-Alpha Etalon Filter Set\u003c\/strong\u003e\u003c\/a\u003e\u003c\/td\u003e\n          \u003ctd\u003eTurns a refractor into a complete H-alpha telescope\u003c\/td\u003e\n          \u003ctd\u003eRefractors up to 50mm of used aperture\u003c\/td\u003e\n          \u003ctd\u003e7 blocking and focuser combinations\u003c\/td\u003e\n          \u003ctd\u003e\u003cstrong\u003e$1,495.99\u003c\/strong\u003e\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003e\u003ca href=\"\/products\/lunt-60mm-full-aperture-h-alpha-etalon-filter-set\"\u003e\u003cstrong\u003eLunt 60mm Full Aperture H-Alpha Etalon Filter Set\u003c\/strong\u003e\u003c\/a\u003e\u003c\/td\u003e\n          \u003ctd\u003eTurns a refractor into a complete H-alpha telescope\u003c\/td\u003e\n          \u003ctd\u003eRefractors up to 60mm of used aperture\u003c\/td\u003e\n          \u003ctd\u003e7 blocking and focuser combinations\u003c\/td\u003e\n          \u003ctd\u003e\u003cstrong\u003e$2,195.99\u003c\/strong\u003e\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003e\u003ca href=\"\/products\/lunt-100mm-full-aperture-h-alpha-etalon-filter-set\"\u003e\u003cstrong\u003eLunt 100mm Full Aperture H-Alpha Etalon Filter Set\u003c\/strong\u003e\u003c\/a\u003e\u003c\/td\u003e\n          \u003ctd\u003eTurns a refractor into a complete H-alpha telescope\u003c\/td\u003e\n          \u003ctd\u003eRefractors up to 100mm of used aperture\u003c\/td\u003e\n          \u003ctd\u003e7 blocking and focuser combinations\u003c\/td\u003e\n          \u003ctd\u003e\u003cstrong\u003e$4,895.99\u003c\/strong\u003e\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003c\/tbody\u003e\n      \u003c\/table\u003e\n    \u003c\/div\u003e\n    \u003cp class=\"pps-sf-table-note\"\u003ePrices shown are the lowest configuration of each product. Blocking filter choice, focuser size and adapter plate all move the final price, so open the product page to see your exact combination.\u003c\/p\u003e\n  \u003c\/section\u003e\n\n  \u003csection class=\"pps-sf-callout\"\u003e\n    \u003cdiv class=\"pps-sf-callout-badge\"\u003eB600\u003cbr\u003eB3400\u003c\/div\u003e\n    \u003cdiv\u003e\n      \u003ch3\u003eHow to read a blocking filter number\u003c\/h3\u003e\n      \u003cp\u003eThe number is the clear aperture of the blocking filter in tenths of a millimetre. B600 is 6mm, B1200 is 12mm, B1800 is 18mm and B3400 is 34mm. A larger blocking filter illuminates a larger field, which matters far more for imaging than for visual use.\u003c\/p\u003e\n      \u003cp\u003eAs a working rule: B600 for visual use on 50mm and 60mm systems, B1200 for visual work at 100mm and for imaging with small sensors, B1800 and B3400 for full disk imaging with larger sensors and for the biggest instruments. Bodies come straight through or as a star diagonal. If your camera has a sensor larger than about 12mm on the diagonal, do not buy a B600.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/section\u003e\n\n  \u003csection class=\"pps-sf-cap\" id=\"pps-sf-hub\"\u003e\n    \u003ch2\u003eShop solar filters by budget\u003c\/h2\u003e\n    \u003cp class=\"pps-sf-cap-sub\"\u003eAll 9 filters, grouped by where they start. Every product appears in exactly one tier.\u003c\/p\u003e\n    \u003cdiv class=\"pps-sf-cap-grid\"\u003e\n      \u003ca class=\"pps-sf-cap-card\" href=\"#pps-sf-feat-t3\"\u003e\n        \u003cdiv class=\"pps-sf-cap-num\"\u003e$26.99 to $395.99\u003c\/div\u003e\n        \u003ch3\u003eGetting started\u003c\/h3\u003e\n        \u003cp\u003e4 products. A polarizer, a glass upgrade, a white light wedge and the standalone blocking filters. This is where you start if you want to see the Sun this weekend without a four figure decision.\u003c\/p\u003e\n        \u003cspan class=\"pps-sf-cap-link\"\u003eSee these filters\u003c\/span\u003e\n      \u003c\/a\u003e\n      \u003ca class=\"pps-sf-cap-card\" href=\"#pps-sf-feat-t2\"\u003e\n        \u003cdiv class=\"pps-sf-cap-num\"\u003e$895.99 to $1,495.99\u003c\/div\u003e\n        \u003ch3\u003eSerious hydrogen-alpha\u003c\/h3\u003e\n        \u003cp\u003e3 products. The calcium K module, the MT double stack and the 50mm full aperture etalon set. The point at which a general purpose refractor becomes a real solar instrument.\u003c\/p\u003e\n        \u003cspan class=\"pps-sf-cap-link\"\u003eSee these filters\u003c\/span\u003e\n      \u003c\/a\u003e\n      \u003ca class=\"pps-sf-cap-card\" href=\"#pps-sf-feat-t1\"\u003e\n        \u003cdiv class=\"pps-sf-cap-num\"\u003e$2,195.99 to $6,995.99\u003c\/div\u003e\n        \u003ch3\u003eLarge aperture\u003c\/h3\u003e\n        \u003cp\u003e2 products. The 60mm and 100mm full aperture etalon sets. Built for observers who already know what they are looking for and want the resolution to find it.\u003c\/p\u003e\n        \u003cspan class=\"pps-sf-cap-link\"\u003eSee these filters\u003c\/span\u003e\n      \u003c\/a\u003e\n    \u003c\/div\u003e\n  \u003c\/section\u003e\n\n  \u003csection class=\"pps-sf-research\"\u003e\n    \u003ch3\u003eKeep researching\u003c\/h3\u003e\n    \u003cp\u003eSolar gear rewards reading before buying. These are the pages people usually want next.\u003c\/p\u003e\n    \u003cdiv class=\"pps-sf-research-links\"\u003e\n        \u003ca href=\"\/collections\/solar-telescopes\"\u003eAll Solar Telescopes\u003c\/a\u003e\n        \u003ca href=\"#pps-sf-compare\"\u003eCompare Filters\u003c\/a\u003e\n        \u003ca href=\"#pps-sf-hub\"\u003eShop By Budget\u003c\/a\u003e\n        \u003ca href=\"\/collections\/refractor-telescopes\"\u003eRefractor Telescopes\u003c\/a\u003e\n        \u003ca href=\"\/collections\/eyepieces\"\u003eSolar Eyepieces\u003c\/a\u003e\n        \u003ca href=\"\/collections\/telescope-accessories\"\u003eAccessories \u0026amp; Adapters\u003c\/a\u003e\n        \u003ca href=\"\/pages\/how-to-choose-a-telescope\"\u003eTelescope Buying Guide\u003c\/a\u003e\n        \u003ca href=\"\/pages\/contact-us\"\u003eTalk To Us\u003c\/a\u003e\n    \u003c\/div\u003e\n  \u003c\/section\u003e\n\n  \u003csection class=\"pps-sf-featured\"\u003e\n    \u003cdiv class=\"pps-sf-featured-head\"\u003e\n      \u003ch2\u003eAll 9 solar filters\u003c\/h2\u003e\n      \u003cp\u003eGrouped the way we would actually recommend them.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003ch3 class=\"pps-sf-tier-head\" id=\"pps-sf-feat-t1\"\u003eFull aperture etalon sets\u003c\/h3\u003e\n    \u003cdiv class=\"pps-sf-featured-grid-3\"\u003e\n      \u003ca class=\"pps-sf-feat-card\" href=\"\/products\/lunt-50mm-full-aperture-h-alpha-etalon-filter-set\"\u003e\n        \u003cdiv class=\"pps-sf-feat-img\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0717\/7968\/0367\/files\/Double-Stack-Filter-50F-Vertical.png?v=1785527459\" alt=\"Lunt 50mm Full Aperture H-Alpha Etalon Filter Set\" loading=\"lazy\"\u003e\u003c\/div\u003e\n        \u003cdiv class=\"pps-sf-feat-body\"\u003e\n          \u003cdiv class=\"pps-sf-feat-meta\"\u003eEtalon Filter Set\u003c\/div\u003e\n          \u003ch3\u003eLunt 50mm Full Aperture H-Alpha Etalon Filter Set\u003c\/h3\u003e\n          \u003cp class=\"pps-sf-feat-desc\"\u003eFront-mounted 50mm etalon, blocking filter and focuser. Converts a refractor up to 50mm of clear aperture into a full hydrogen-alpha instrument.\u003c\/p\u003e\n          \u003cdiv class=\"pps-sf-feat-price\"\u003eFrom $1,495.99\u003c\/div\u003e\n          \u003cspan class=\"pps-sf-feat-cta\"\u003eView Details\u003c\/span\u003e\n        \u003c\/div\u003e\n      \u003c\/a\u003e\n      \u003ca class=\"pps-sf-feat-card\" href=\"\/products\/lunt-60mm-full-aperture-h-alpha-etalon-filter-set\"\u003e\n        \u003cdiv class=\"pps-sf-feat-img\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0717\/7968\/0367\/files\/Double-Stack-Filter-60F-Lunt-Solar-Telescope_cf061cf5-9959-40a7-aa24-70f8fa9e6750.jpg?v=1785527516\" alt=\"Lunt 60mm Full Aperture H-Alpha Etalon Filter Set\" loading=\"lazy\"\u003e\u003c\/div\u003e\n        \u003cdiv class=\"pps-sf-feat-body\"\u003e\n          \u003cdiv class=\"pps-sf-feat-meta\"\u003eEtalon Filter Set\u003c\/div\u003e\n          \u003ch3\u003eLunt 60mm Full Aperture H-Alpha Etalon Filter Set\u003c\/h3\u003e\n          \u003cp class=\"pps-sf-feat-desc\"\u003eThe 60mm version of the same system. More aperture means finer prominence and filament detail without changing telescopes.\u003c\/p\u003e\n          \u003cdiv class=\"pps-sf-feat-price\"\u003eFrom $2,195.99\u003c\/div\u003e\n          \u003cspan class=\"pps-sf-feat-cta\"\u003eView Details\u003c\/span\u003e\n        \u003c\/div\u003e\n      \u003c\/a\u003e\n      \u003ca class=\"pps-sf-feat-card\" href=\"\/products\/lunt-100mm-full-aperture-h-alpha-etalon-filter-set\"\u003e\n        \u003cdiv class=\"pps-sf-feat-img\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0717\/7968\/0367\/files\/DS2-80-Double-Stack-Filter-Lunt-Solar-Telescope_ecbf3db1-7aeb-4373-8927-fc3e746289e4.jpg?v=1785527527\" alt=\"Lunt 100mm Full Aperture H-Alpha Etalon Filter Set\" loading=\"lazy\"\u003e\u003c\/div\u003e\n        \u003cdiv class=\"pps-sf-feat-body\"\u003e\n          \u003cdiv class=\"pps-sf-feat-meta\"\u003eEtalon Filter Set\u003c\/div\u003e\n          \u003ch3\u003eLunt 100mm Full Aperture H-Alpha Etalon Filter Set\u003c\/h3\u003e\n          \u003cp class=\"pps-sf-feat-desc\"\u003eThe largest full aperture set we carry. Built for serious visual work and high resolution solar imaging on a 100mm refractor.\u003c\/p\u003e\n          \u003cdiv class=\"pps-sf-feat-price\"\u003eFrom $4,895.99\u003c\/div\u003e\n          \u003cspan class=\"pps-sf-feat-cta\"\u003eView Details\u003c\/span\u003e\n        \u003c\/div\u003e\n      \u003c\/a\u003e\n    \u003c\/div\u003e\n\n    \u003ch3 class=\"pps-sf-tier-head\" id=\"pps-sf-feat-t2\"\u003eBlocking filters and wavelength modules\u003c\/h3\u003e\n    \u003cdiv class=\"pps-sf-featured-grid-3\"\u003e\n      \u003ca class=\"pps-sf-feat-card\" href=\"\/products\/lunt-h-alpha-blocking-filter\"\u003e\n        \u003cdiv class=\"pps-sf-feat-img\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0717\/7968\/0367\/files\/B600-Blocking-Filter-Profile.jpg?v=1785527527\" alt=\"Lunt H-Alpha Blocking Filter\" loading=\"lazy\"\u003e\u003c\/div\u003e\n        \u003cdiv class=\"pps-sf-feat-body\"\u003e\n          \u003cdiv class=\"pps-sf-feat-meta\"\u003eBlocking Filter\u003c\/div\u003e\n          \u003ch3\u003eLunt H-Alpha Blocking Filter\u003c\/h3\u003e\n          \u003cp class=\"pps-sf-feat-desc\"\u003eThe second half of every H-alpha system. Ten versions from B600 through B3400, in straight through and star diagonal bodies.\u003c\/p\u003e\n          \u003cdiv class=\"pps-sf-feat-price\"\u003eFrom $395.99\u003c\/div\u003e\n          \u003cspan class=\"pps-sf-feat-cta\"\u003eView Details\u003c\/span\u003e\n        \u003c\/div\u003e\n      \u003c\/a\u003e\n      \u003ca class=\"pps-sf-feat-card\" href=\"\/products\/lunt-calcium-k-blocking-filter-module\"\u003e\n        \u003cdiv class=\"pps-sf-feat-img\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0717\/7968\/0367\/files\/CaK-Blocking-Filter-Ck-Diagonal-Profile-Lunt-Solar-Telescope-1.jpg?v=1785527446\" alt=\"Lunt Calcium K Blocking Filter Module\" loading=\"lazy\"\u003e\u003c\/div\u003e\n        \u003cdiv class=\"pps-sf-feat-body\"\u003e\n          \u003cdiv class=\"pps-sf-feat-meta\"\u003eWavelength Module\u003c\/div\u003e\n          \u003ch3\u003eLunt Calcium K Blocking Filter Module\u003c\/h3\u003e\n          \u003cp class=\"pps-sf-feat-desc\"\u003eMoves you off hydrogen-alpha and into the calcium K line, where the chromospheric network and plage stand out. Eight configurations.\u003c\/p\u003e\n          \u003cdiv class=\"pps-sf-feat-price\"\u003eFrom $895.99\u003c\/div\u003e\n          \u003cspan class=\"pps-sf-feat-cta\"\u003eView Details\u003c\/span\u003e\n        \u003c\/div\u003e\n      \u003c\/a\u003e\n      \u003ca class=\"pps-sf-feat-card\" href=\"\/products\/lunt-double-stack-etalon-filter-for-mt-telescopes\"\u003e\n        \u003cdiv class=\"pps-sf-feat-img\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0717\/7968\/0367\/files\/DS2-80-Double-Stack-Filter-Lunt-Solar-Telescope.jpg?v=1785527455\" alt=\"Lunt Double Stack Etalon Filter for MT Telescopes\" loading=\"lazy\"\u003e\u003c\/div\u003e\n        \u003cdiv class=\"pps-sf-feat-body\"\u003e\n          \u003cdiv class=\"pps-sf-feat-meta\"\u003eDouble Stack Upgrade\u003c\/div\u003e\n          \u003ch3\u003eLunt Double Stack Etalon Filter for MT Telescopes\u003c\/h3\u003e\n          \u003cp class=\"pps-sf-feat-desc\"\u003eAdds a second etalon to an MT series telescope, narrowing the bandwidth and lifting surface contrast dramatically.\u003c\/p\u003e\n          \u003cdiv class=\"pps-sf-feat-price\"\u003eFrom $1,145.99\u003c\/div\u003e\n          \u003cspan class=\"pps-sf-feat-cta\"\u003eView Details\u003c\/span\u003e\n        \u003c\/div\u003e\n      \u003c\/a\u003e\n    \u003c\/div\u003e\n\n    \u003ch3 class=\"pps-sf-tier-head\" id=\"pps-sf-feat-t3\"\u003eWhite light and refinement\u003c\/h3\u003e\n    \u003cdiv class=\"pps-sf-featured-grid-3\"\u003e\n      \u003ca class=\"pps-sf-feat-card\" href=\"\/products\/lunt-white-light-solar-wedge\"\u003e\n        \u003cdiv class=\"pps-sf-feat-img\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0717\/7968\/0367\/files\/White-Light-Solar-Wedges-1-e1539710721773.jpg?v=1785527456\" alt=\"Lunt White Light Solar Wedge\" loading=\"lazy\"\u003e\u003c\/div\u003e\n        \u003cdiv class=\"pps-sf-feat-body\"\u003e\n          \u003cdiv class=\"pps-sf-feat-meta\"\u003eWhite Light\u003c\/div\u003e\n          \u003ch3\u003eLunt White Light Solar Wedge\u003c\/h3\u003e\n          \u003cp class=\"pps-sf-feat-desc\"\u003eThe most affordable way onto the Sun with a refractor you already own. Sunspots, granulation and faculae in high contrast white light.\u003c\/p\u003e\n          \u003cdiv class=\"pps-sf-feat-price\"\u003eFrom $275.99\u003c\/div\u003e\n          \u003cspan class=\"pps-sf-feat-cta\"\u003eView Details\u003c\/span\u003e\n        \u003c\/div\u003e\n      \u003c\/a\u003e\n      \u003ca class=\"pps-sf-feat-card\" href=\"\/products\/lunt-high-resolution-glass-upgrade\"\u003e\n        \u003cdiv class=\"pps-sf-feat-img\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0717\/7968\/0367\/files\/IMG_3031-scaled.jpg?v=1785527524\" alt=\"Lunt High Resolution Glass Upgrade\" loading=\"lazy\"\u003e\u003c\/div\u003e\n        \u003cdiv class=\"pps-sf-feat-body\"\u003e\n          \u003cdiv class=\"pps-sf-feat-meta\"\u003eOptical Upgrade\u003c\/div\u003e\n          \u003ch3\u003eLunt High Resolution Glass Upgrade\u003c\/h3\u003e\n          \u003cp class=\"pps-sf-feat-desc\"\u003eSwaps the glass in a double stack or pressure tuner assembly for a higher grade set. A refinement for owners chasing the last of the detail.\u003c\/p\u003e\n          \u003cdiv class=\"pps-sf-feat-price\"\u003eFrom $249.99\u003c\/div\u003e\n          \u003cspan class=\"pps-sf-feat-cta\"\u003eView Details\u003c\/span\u003e\n        \u003c\/div\u003e\n      \u003c\/a\u003e\n      \u003ca class=\"pps-sf-feat-card\" href=\"\/products\/lunt-polarizing-filter-unit\"\u003e\n        \u003cdiv class=\"pps-sf-feat-img\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0717\/7968\/0367\/files\/IMG_4077.jpg?v=1785527508\" alt=\"Lunt Polarizing Filter Unit\" loading=\"lazy\"\u003e\u003c\/div\u003e\n        \u003cdiv class=\"pps-sf-feat-body\"\u003e\n          \u003cdiv class=\"pps-sf-feat-meta\"\u003eContrast Control\u003c\/div\u003e\n          \u003ch3\u003eLunt Polarizing Filter Unit\u003c\/h3\u003e\n          \u003cp class=\"pps-sf-feat-desc\"\u003eA variable polarizer that lets you dial brightness down to comfort without losing contrast. The least expensive upgrade on this page.\u003c\/p\u003e\n          \u003cdiv class=\"pps-sf-feat-price\"\u003eFrom $26.99\u003c\/div\u003e\n          \u003cspan class=\"pps-sf-feat-cta\"\u003eView Details\u003c\/span\u003e\n        \u003c\/div\u003e\n      \u003c\/a\u003e\n    \u003c\/div\u003e\n  \u003c\/section\u003e\n\n  \u003csection class=\"pps-sf-peers\"\u003e\n    \u003ch2\u003eWhere to go next\u003c\/h2\u003e\n    \u003cp class=\"pps-sf-peers-sub\"\u003eFilters are one part of a solar setup. These pages cover the rest.\u003c\/p\u003e\n    \u003cdiv class=\"pps-sf-peers-grid\"\u003e\n      \u003ca class=\"pps-sf-peer-card\" href=\"\/collections\/solar-telescopes\"\u003e\u003ch3\u003eSolar Telescopes\u003c\/h3\u003e\n\u003cp\u003e10 purpose built models\u003c\/p\u003e\u003c\/a\u003e\n      \u003ca class=\"pps-sf-peer-card\" href=\"\/collections\/telescopes\"\u003e\u003ch3\u003eTelescopes\u003c\/h3\u003e\n\u003cp\u003e32 models, all types\u003c\/p\u003e\u003c\/a\u003e\n      \u003ca class=\"pps-sf-peer-card\" href=\"\/collections\/refractor-telescopes\"\u003e\u003ch3\u003eRefractor Telescopes\u003c\/h3\u003e\n\u003cp\u003e13 models, best for solar conversion\u003c\/p\u003e\u003c\/a\u003e\n      \u003ca class=\"pps-sf-peer-card\" href=\"\/collections\/eyepieces\"\u003e\u003ch3\u003eEyepieces\u003c\/h3\u003e\n\u003cp\u003e10 series including a solar eyepiece\u003c\/p\u003e\u003c\/a\u003e\n      \u003ca class=\"pps-sf-peer-card\" href=\"\/collections\/mounts\"\u003e\u003ch3\u003eMounts \u0026amp; Stands\u003c\/h3\u003e\n\u003cp\u003eTracking mounts and tripods\u003c\/p\u003e\u003c\/a\u003e\n      \u003ca class=\"pps-sf-peer-card\" href=\"\/collections\/telescope-accessories\"\u003e\u003ch3\u003eAccessories\u003c\/h3\u003e\n\u003cp\u003eAdapters, cases and tuners\u003c\/p\u003e\u003c\/a\u003e\n      \u003ca class=\"pps-sf-peer-card\" href=\"\/collections\/dobsonian-telescopes\"\u003e\u003ch3\u003eDobsonian Telescopes\u003c\/h3\u003e\n\u003cp\u003e5 models for deep sky nights\u003c\/p\u003e\u003c\/a\u003e\n      \u003ca class=\"pps-sf-peer-card\" href=\"\/pages\/how-to-choose-a-telescope\"\u003e\u003ch3\u003eBuying Guide\u003c\/h3\u003e\n\u003cp\u003eHow to choose your first setup\u003c\/p\u003e\u003c\/a\u003e\n    \u003c\/div\u003e\n  \u003c\/section\u003e\n\n  \u003csection class=\"pps-sf-faq\"\u003e\n    \u003cdiv class=\"pps-sf-faq-head\"\u003e\n      \u003ch2\u003eSolar filter questions, answered\u003c\/h2\u003e\n      \u003cp\u003eThe questions we field most often on the phone.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"pps-sf-faq-list\"\u003e\n        \u003cdetails\u003e\n          \u003csummary\u003eIs it ever safe to point a telescope at the Sun without a filter?\u003c\/summary\u003e\n          \u003cdiv class=\"pps-sf-faq-body\"\u003e\u003cp\u003eNo. An unfiltered telescope aimed at the Sun concentrates enough energy to cause permanent eye injury in a fraction of a second, and it can destroy an eyepiece or a camera sensor just as fast. Every product on this page exists so that the Sun is filtered before the light is concentrated, not after.\u003c\/p\u003e\u003c\/div\u003e\n        \u003c\/details\u003e\n        \u003cdetails\u003e\n          \u003csummary\u003eWhat is the difference between a white light filter and a hydrogen-alpha filter?\u003c\/summary\u003e\n          \u003cdiv class=\"pps-sf-faq-body\"\u003e\u003cp\u003eA white light filter such as the Lunt White Light Solar Wedge cuts the intensity across the whole visible spectrum. You see the photosphere: sunspots, granulation and faculae, in a crisp neutral image. A hydrogen-alpha etalon set isolates one extremely narrow wavelength and shows the chromosphere instead: prominences on the limb, filaments and flare activity across the disk. They show two different layers of the Sun, so many observers eventually own both.\u003c\/p\u003e\u003c\/div\u003e\n        \u003c\/details\u003e\n        \u003cdetails\u003e\n          \u003csummary\u003eWhat does the blocking filter actually do, and why do I need one?\u003c\/summary\u003e\n          \u003cdiv class=\"pps-sf-faq-body\"\u003e\u003cp\u003eThe etalon at the front of the telescope narrows the light to roughly the hydrogen-alpha line, but it also passes several secondary bands. The blocking filter sits at the focuser and rejects everything except the one band you want. Without it you get a washed out image and an unsafe amount of energy reaching the eyepiece. An etalon and a blocking filter are two halves of one system and neither works alone.\u003c\/p\u003e\u003c\/div\u003e\n        \u003c\/details\u003e\n        \u003cdetails\u003e\n          \u003csummary\u003eHow do I choose between B600, B1200, B1800 and B3400?\u003c\/summary\u003e\n          \u003cdiv class=\"pps-sf-faq-body\"\u003e\u003cp\u003eThe number is roughly the clear aperture of the blocking filter in tenths of a millimetre, so B600 is 6mm and B3400 is 34mm. A larger blocking filter passes a larger fully illuminated field. B600 suits visual use on smaller apertures. B1200 is the common choice for visual work at 100mm and for imaging with small sensors. B1800 and B3400 are for full disk imaging with larger sensors and for the biggest instruments. If you are unsure, call us with your telescope and camera and we will tell you which one clears your sensor.\u003c\/p\u003e\u003c\/div\u003e\n        \u003c\/details\u003e\n        \u003cdetails\u003e\n          \u003csummary\u003eWill a full aperture etalon set work on my telescope?\u003c\/summary\u003e\n          \u003cdiv class=\"pps-sf-faq-body\"\u003e\u003cp\u003eThe sets are sized by the aperture of light they pass: 50mm, 60mm and 100mm. They mount on the front of a refractor. If your refractor is larger than the set, the set simply stops it down to its own size, which is perfectly usable. Reflectors and most catadioptric telescopes are not suitable because of the heat load on internal optics. If you would rather not adapt an existing scope, our \u003ca href=\"\/collections\/solar-telescopes\"\u003esolar telescopes\u003c\/a\u003e arrive already filtered.\u003c\/p\u003e\u003c\/div\u003e\n        \u003c\/details\u003e\n        \u003cdetails\u003e\n          \u003csummary\u003eWhat does double stacking do?\u003c\/summary\u003e\n          \u003cdiv class=\"pps-sf-faq-body\"\u003e\u003cp\u003eDouble stacking puts a second etalon in the light path. That roughly halves the bandwidth, which raises surface contrast noticeably: filaments darken, active regions gain structure, and the disk stops looking flat. The tradeoff is a dimmer image and a significant increase in cost. Most people single stack first and add the \u003ca href=\"\/products\/lunt-double-stack-etalon-filter-for-mt-telescopes\"\u003edouble stack etalon\u003c\/a\u003e later once they know they want it.\u003c\/p\u003e\u003c\/div\u003e\n        \u003c\/details\u003e\n        \u003cdetails\u003e\n          \u003csummary\u003eWhat is calcium K and is it worth adding?\u003c\/summary\u003e\n          \u003cdiv class=\"pps-sf-faq-body\"\u003e\u003cp\u003eCalcium K sits in the near ultraviolet at about 393nm and reveals the chromospheric network and bright plage around active regions. It looks nothing like the hydrogen-alpha view. Because the wavelength is at the edge of human sensitivity, many observers find it more rewarding as an imaging target than a visual one. The \u003ca href=\"\/products\/lunt-calcium-k-blocking-filter-module\"\u003eCalcium K Blocking Filter Module\u003c\/a\u003e is the way in.\u003c\/p\u003e\u003c\/div\u003e\n        \u003c\/details\u003e\n        \u003cdetails\u003e\n          \u003csummary\u003eCan I use these filters for solar photography?\u003c\/summary\u003e\n          \u003cdiv class=\"pps-sf-faq-body\"\u003e\u003cp\u003eYes, and that is where much of this equipment earns its keep. For imaging, pay attention to two things: pick a blocking filter large enough to illuminate your sensor fully, and consider a pressure tuner or double stack if you want maximum surface contrast. Our \u003ca href=\"\/collections\/telescope-accessories\"\u003eaccessories\u003c\/a\u003e range includes the adapters and tuning hardware that go with a solar imaging train.\u003c\/p\u003e\u003c\/div\u003e\n        \u003c\/details\u003e\n        \u003cdetails\u003e\n          \u003csummary\u003eWhat is the polarizing filter unit for?\u003c\/summary\u003e\n          \u003cdiv class=\"pps-sf-faq-body\"\u003e\u003cp\u003eIt is a variable brightness control. Two polarizers rotate against each other so you can reduce image intensity smoothly rather than in fixed steps. At under fifty dollars it is the cheapest way to make a bright solar or lunar image comfortable to look at for long sessions.\u003c\/p\u003e\u003c\/div\u003e\n        \u003c\/details\u003e\n        \u003cdetails\u003e\n          \u003csummary\u003eDo these filters fit non-Lunt telescopes?\u003c\/summary\u003e\n          \u003cdiv class=\"pps-sf-faq-body\"\u003e\u003cp\u003eThe full aperture etalon sets are designed to mount to a range of refractor tube diameters and are the most adaptable items here. The blocking filters use standard 1.25 inch and 2 inch fittings. The double stack modules and the high resolution glass upgrade are matched to specific Lunt bodies and are listed with the models they fit. When in doubt, tell us the exact telescope you own before ordering.\u003c\/p\u003e\u003c\/div\u003e\n        \u003c\/details\u003e\n        \u003cdetails\u003e\n          \u003csummary\u003eHow should I store and care for a solar filter?\u003c\/summary\u003e\n          \u003cdiv class=\"pps-sf-faq-body\"\u003e\u003cp\u003eKeep it capped and dry, and treat the etalon like the precision optic it is. Do not disassemble it, and clean the outer surfaces only when genuinely necessary using proper optical technique. Inspect any solar filter for pinholes, scratches or delamination before every single session. If you find damage of any kind, do not use it.\u003c\/p\u003e\u003c\/div\u003e\n        \u003c\/details\u003e\n        \u003cdetails\u003e\n          \u003csummary\u003eWhat if I want the whole thing rather than a conversion?\u003c\/summary\u003e\n          \u003cdiv class=\"pps-sf-faq-body\"\u003e\u003cp\u003eThen start with a purpose built instrument instead. Our \u003ca href=\"\/collections\/solar-telescopes\"\u003esolar telescopes\u003c\/a\u003e collection runs from the LS50THa at $995.99 to the LS230THa at $39,995.99, with the safety filtering engineered into the telescope rather than added to it. If you are weighing the two paths, our \u003ca href=\"\/pages\/how-to-choose-a-telescope\"\u003ebuying guide\u003c\/a\u003e walks through the decision.\u003c\/p\u003e\u003c\/div\u003e\n        \u003c\/details\u003e\n    \u003c\/div\u003e\n  \u003c\/section\u003e\n\n\u003c\/div\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Is it ever safe to point a telescope at the Sun without a filter?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. An unfiltered telescope aimed at the Sun concentrates enough energy to cause permanent eye injury in a fraction of a second, and it can destroy an eyepiece or a camera sensor just as fast. Every product on this page exists so that the Sun is filtered before the light is concentrated, not after.\"}},{\"@type\":\"Question\",\"name\":\"What is the difference between a white light filter and a hydrogen-alpha filter?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"A white light filter such as the Lunt White Light Solar Wedge cuts the intensity across the whole visible spectrum. You see the photosphere: sunspots, granulation and faculae, in a crisp neutral image. A hydrogen-alpha etalon set isolates one extremely narrow wavelength and shows the chromosphere instead: prominences on the limb, filaments and flare activity across the disk. They show two different layers of the Sun, so many observers eventually own both.\"}},{\"@type\":\"Question\",\"name\":\"What does the blocking filter actually do, and why do I need one?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The etalon at the front of the telescope narrows the light to roughly the hydrogen-alpha line, but it also passes several secondary bands. The blocking filter sits at the focuser and rejects everything except the one band you want. Without it you get a washed out image and an unsafe amount of energy reaching the eyepiece. An etalon and a blocking filter are two halves of one system and neither works alone.\"}},{\"@type\":\"Question\",\"name\":\"How do I choose between B600, B1200, B1800 and B3400?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The number is roughly the clear aperture of the blocking filter in tenths of a millimetre, so B600 is 6mm and B3400 is 34mm. A larger blocking filter passes a larger fully illuminated field. B600 suits visual use on smaller apertures. B1200 is the common choice for visual work at 100mm and for imaging with small sensors. B1800 and B3400 are for full disk imaging with larger sensors and for the biggest instruments. If you are unsure, call us with your telescope and camera and we will tell you which one clears your sensor.\"}},{\"@type\":\"Question\",\"name\":\"Will a full aperture etalon set work on my telescope?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The sets are sized by the aperture of light they pass: 50mm, 60mm and 100mm. They mount on the front of a refractor. If your refractor is larger than the set, the set simply stops it down to its own size, which is perfectly usable. Reflectors and most catadioptric telescopes are not suitable because of the heat load on internal optics. If you would rather not adapt an existing scope, our solar telescopes arrive already filtered.\"}},{\"@type\":\"Question\",\"name\":\"What does double stacking do?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Double stacking puts a second etalon in the light path. That roughly halves the bandwidth, which raises surface contrast noticeably: filaments darken, active regions gain structure, and the disk stops looking flat. The tradeoff is a dimmer image and a significant increase in cost. Most people single stack first and add the double stack etalon later once they know they want it.\"}},{\"@type\":\"Question\",\"name\":\"What is calcium K and is it worth adding?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Calcium K sits in the near ultraviolet at about 393nm and reveals the chromospheric network and bright plage around active regions. It looks nothing like the hydrogen-alpha view. Because the wavelength is at the edge of human sensitivity, many observers find it more rewarding as an imaging target than a visual one. The Calcium K Blocking Filter Module is the way in.\"}},{\"@type\":\"Question\",\"name\":\"Can I use these filters for solar photography?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, and that is where much of this equipment earns its keep. For imaging, pay attention to two things: pick a blocking filter large enough to illuminate your sensor fully, and consider a pressure tuner or double stack if you want maximum surface contrast. Our accessories range includes the adapters and tuning hardware that go with a solar imaging train.\"}},{\"@type\":\"Question\",\"name\":\"What is the polarizing filter unit for?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It is a variable brightness control. Two polarizers rotate against each other so you can reduce image intensity smoothly rather than in fixed steps. At under fifty dollars it is the cheapest way to make a bright solar or lunar image comfortable to look at for long sessions.\"}},{\"@type\":\"Question\",\"name\":\"Do these filters fit non-Lunt telescopes?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The full aperture etalon sets are designed to mount to a range of refractor tube diameters and are the most adaptable items here. The blocking filters use standard 1.25 inch and 2 inch fittings. The double stack modules and the high resolution glass upgrade are matched to specific Lunt bodies and are listed with the models they fit. When in doubt, tell us the exact telescope you own before ordering.\"}},{\"@type\":\"Question\",\"name\":\"How should I store and care for a solar filter?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Keep it capped and dry, and treat the etalon like the precision optic it is. Do not disassemble it, and clean the outer surfaces only when genuinely necessary using proper optical technique. Inspect any solar filter for pinholes, scratches or delamination before every single session. If you find damage of any kind, do not use it.\"}},{\"@type\":\"Question\",\"name\":\"What if I want the whole thing rather than a conversion?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Then start with a purpose built instrument instead. Our solar telescopes collection runs from the LS50THa at $995.99 to the LS230THa at $39,995.99, with the safety filtering engineered into the telescope rather than added to it. If you are weighing the two paths, our buying guide walks through the decision.\"}}]}\u003c\/script\u003e\n","products":[{"product_id":"lunt-calcium-k-blocking-filter-module","title":"Lunt Calcium K Blocking Filter Module","description":"\u003cdiv class=\"kt-page\"\u003e\n\n\u003cstyle\u003e\n.kt-page{--kt-primary:#030B1C;--kt-accent:#2E7FBF;max-width:1100px;margin:0 auto;font-family:inherit;}\n.kt-page.kt-page--wide{max-width:1600px;}\n.kt-page .kt-hero{display:flex;align-items:center;gap:40px;margin-bottom:40px;}\n.kt-page .kt-hero-copy{flex:1 1 55%;}\n.kt-page .kt-hero-img{flex:1 1 40%;text-align:center;}\n.kt-page .kt-sq{width:100%;max-width:420px;aspect-ratio:1\/1;margin:0 auto;background:#ffffff;border-radius:6px;display:flex;align-items:center;justify-content:center;overflow:hidden;}\n.kt-page .kt-sq img{max-width:92%;max-height:92%;width:auto;height:auto;object-fit:contain;}\n.kt-page .kt-hero-copy h2{font-size:26px;margin-bottom:14px;}\n.kt-page .kt-hero-copy p{font-size:16px;line-height:1.6;margin-bottom:14px;}\n.kt-page .kt-features{display:flex;align-items:flex-start;gap:40px;margin:40px 0;}\n.kt-page .kt-features-copy{flex:1 1 55%;}\n.kt-page .kt-features-img{flex:1 1 40%;text-align:center;}\n.kt-page .kt-section-heading{font-size:21px;display:inline-block;padding-bottom:8px;border-bottom:2px solid var(--kt-accent);margin-bottom:18px;}\n.kt-page .kt-feature-list{list-style:none;margin:0;padding:0;}\n.kt-page .kt-feature-list li{font-size:16px;line-height:1.5;margin-bottom:12px;padding-left:26px;position:relative;}\n.kt-page .kt-feature-list li:before{content:\"\\2713\";color:var(--kt-accent);font-weight:bold;position:absolute;left:0;}\n.kt-page .kt-feature-list b{color:#222;}\n.kt-page .kt-specs-wrap{box-sizing:border-box;}\n.kt-page .kt-specs{display:table !important;width:100% !important;border-collapse:collapse;margin:40px 0;font-size:15px;}\n.kt-page .kt-specs th,.kt-page .kt-specs td{border:2px solid #000;padding:10px 12px;text-align:left;}\n.kt-page .kt-specs th{background:var(--kt-primary) !important;color:#fff !important;font-size:16px;}\n.kt-page .kt-specs tr:nth-child(even){background:#f2f2f2;}\n.kt-page .kt-specs tr:nth-child(odd){background:#ffffff;}\n.kt-page .kt-cta{text-align:center;margin:40px 0;font-size:18px;font-weight:bold;}\n.kt-page .kt-cta-buttons{display:flex;justify-content:center;gap:16px;margin-top:16px;flex-wrap:wrap;}\n.kt-page .kt-cta-buttons a{display:inline-block;padding:12px 26px;border:2px solid var(--kt-primary);border-radius:4px;color:var(--kt-primary);text-decoration:none;font-weight:bold;font-size:15px;transition:all .15s ease;}\n.kt-page .kt-cta-buttons a:hover{background:var(--kt-primary);color:#fff;}\n.kt-page .kt-manuals a{display:block;color:var(--kt-primary);font-weight:bold;font-size:30px;text-align:left;text-decoration:none;margin-bottom:10px;}\n.kt-page .kt-manuals a:hover{color:var(--kt-accent);}\n@media (max-width:768px){\n  .kt-page .kt-hero,.kt-page .kt-features{flex-direction:column;}\n  .kt-page .kt-hero-img img,.kt-page .kt-features-img img{max-width:400px;}\n  .kt-page .kt-hero-copy p,.kt-page .kt-features-copy p{font-size:17px;}\n  .kt-page .kt-cta-buttons{display:grid;grid-template-columns:1fr 1fr;gap:12px;}\n  .kt-page .kt-cta-buttons a:nth-child(3){grid-column:1 \/ span 2;}\n  .kt-page .kt-manuals a{font-size:24px;}\n}\n\u003c\/style\u003e\n\n\u003cdiv class=\"kt-hero\"\u003e\n  \u003cdiv class=\"kt-hero-copy\"\u003e\n    \u003ch2\u003eSee The Sun In Calcium K Light\u003c\/h2\u003e\n        \u003cp\u003eThis calcium K blocking module from Lunt works at 393.4 nm, the calcium K line at the violet edge of the visible spectrum. It shows a lower, cooler layer than hydrogen alpha, where supergranulation cells and bright plage trace the magnetic network. Running CaK alongside H-alpha tells you more about the structure and depth of active regions.\u003c\/p\u003e\n    \u003cp\u003eTreat CaK as a photographic wavelength. Most adult eyes respond poorly at 393 nm because the cornea and lens yellow with age, so many observers see the violet colour but little contrast. Observers who have had cataract surgery often see far more. A camera records the detail readily, which is why the module is built around imaging.\u003c\/p\u003e\n    \u003cp\u003eThe module carries internal narrowband filters for a bandpass under 2.4 Angstrom and mounts on most standard night time refractors, or on a Lunt modular telescope in its night configuration. Pick the blocking aperture by focal length: B600 to 600 mm, B1200 to 1200 mm and B1800 to 1800 mm, each rated for apertures up to 100 mm.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"kt-hero-img\"\u003e\n    \u003cdiv class=\"kt-sq\"\u003e\n      \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0615\/8273\/7521\/files\/CaK-Blocking-Filter-Ck-Diagonal-Profile-Lunt-Solar-Telescope-1.jpg?v=1743112811\" alt=\"Profile view of a Lunt Calcium K blocking filter module in a 2 inch star diagonal housing\"\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"kt-features\"\u003e\n  \u003cdiv class=\"kt-features-copy\"\u003e\n    \u003ch3 class=\"kt-section-heading\"\u003eKey Features\u003c\/h3\u003e\n    \u003cul class=\"kt-feature-list\"\u003e\n      \u003cli\u003e\n\u003cb\u003eCalcium K Line\u003c\/b\u003e - centred on 393.4 nm, a lower and cooler layer than the hydrogen alpha chromosphere\u003c\/li\u003e\n      \u003cli\u003e\n\u003cb\u003eNarrow Bandpass\u003c\/b\u003e - internal narrowband filters give less than 2.4 Angstrom\u003c\/li\u003e\n      \u003cli\u003e\n\u003cb\u003eImaging First\u003c\/b\u003e - most adult eyes respond poorly at 393 nm, so a camera is the usual detector\u003c\/li\u003e\n      \u003cli\u003e\n\u003cb\u003eThree Apertures\u003c\/b\u003e - 6 mm, 12 mm and 18 mm modules cover focal lengths to 600, 1200 and 1800 mm\u003c\/li\u003e\n      \u003cli\u003e\n\u003cb\u003eHousing Choice\u003c\/b\u003e - each aperture comes as a 2 inch star diagonal or a 2 inch straight through tube\u003c\/li\u003e\n      \u003cli\u003e\n\u003cb\u003eWide Compatibility\u003c\/b\u003e - fits most standard night time refractors and Lunt modular telescopes in night configuration\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"kt-features-img\"\u003e\n    \u003cdiv class=\"kt-sq\"\u003e\n      \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0615\/8273\/7521\/files\/CaK-Blocking-Filter-C-Straight-Through-Lunt-Solar-Telescope.jpg?v=1743112811\" alt=\"Lunt Calcium K blocking filter module in a 2 inch straight through extension tube\"\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"kt-specs-wrap\"\u003e\n\u003ctable class=\"kt-specs\"\u003e\n  \u003ctr\u003e\u003cth colspan=\"2\"\u003eSpecifications\u003c\/th\u003e\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eCalcium K blocking filter module\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eWavelength\u003c\/td\u003e\n\u003ctd\u003e393.4 nm, the calcium K line\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eBandpass\u003c\/td\u003e\n\u003ctd\u003eLess than 2.4 Angstrom\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003ePrimary Use\u003c\/td\u003e\n\u003ctd\u003eImaging, since most adult eyes respond poorly at 393 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e6 mm Diagonal Module\u003c\/td\u003e\n\u003ctd\u003e2 inch star diagonal, telescopes to 100 mm aperture and 600 mm focal length\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e6 mm Straight Module\u003c\/td\u003e\n\u003ctd\u003e2 inch straight through tube, same aperture and focal length rating\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e12 mm Diagonal Module\u003c\/td\u003e\n\u003ctd\u003e2 inch star diagonal, telescopes to 100 mm aperture and 1200 mm focal length\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e12 mm Straight Module\u003c\/td\u003e\n\u003ctd\u003e2 inch straight through tube, same aperture and focal length rating\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e18 mm Diagonal Module\u003c\/td\u003e\n\u003ctd\u003e2 inch star diagonal, telescopes to 100 mm aperture and 1800 mm focal length\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e18 mm Straight Module\u003c\/td\u003e\n\u003ctd\u003e2 inch straight through tube, listed on the storefront as LS18CaKMDs2\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e130 mm Module\u003c\/td\u003e\n\u003ctd\u003eListed as the 130mm Universal CaK Module, storefront SKU LSCaKMD, published as a single option\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eTelescope Aperture Limit\u003c\/td\u003e\n\u003ctd\u003eUp to 100 mm for the 2 inch modules\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eMost standard night time refractors and Lunt modular telescopes in night configuration\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eModel \/ SKU\u003c\/td\u003e\n\u003ctd\u003eLS6CaKMDd, LS6CaKMDs, LS12CaKMDd, LS12CaKMDs, LS18CaKMDd, LS18CaKMDs and LS130TCaKMD\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eStorefront SKU Format\u003c\/td\u003e\n\u003ctd\u003eLS6CaKMD, LS12CaKMD, LS18CaKMD, LS6CaKMDs, LS12CaKMDs, LS18CaKMDs2 and LSCaKMD\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eShipping Weight\u003c\/td\u003e\n\u003ctd\u003e2 lb for the 2 inch modules, 4 lb for the 130 mm module\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e5 years from date of purchase, original purchaser, manufacturing and workmanship defects\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\n\n\u003cp class=\"kt-cta\"\u003e\n  Talk to a Specialist\n  \u003cspan class=\"kt-cta-buttons\"\u003e\n    \u003ca href=\"\/pages\/contact\" style=\"display:inline-block;padding:12px 26px;border:2px solid var(--kt-primary);border-radius:4px;color:var(--kt-primary);text-decoration:none;font-weight:bold;\"\u003eContact Us\u003c\/a\u003e\n    \u003ca href=\"mailto:sales@telescopedepot.com\" style=\"display:inline-block;padding:12px 26px;border:2px solid var(--kt-primary);border-radius:4px;color:var(--kt-primary);text-decoration:none;font-weight:bold;\"\u003eEmail a Specialist\u003c\/a\u003e\n    \u003ca href=\"\/pages\/shipping\" style=\"display:inline-block;padding:12px 26px;border:2px solid var(--kt-primary);border-radius:4px;color:var(--kt-primary);text-decoration:none;font-weight:bold;\"\u003eShipping Info\u003c\/a\u003e\n  \u003c\/span\u003e\n\u003c\/p\u003e\n\n\u003c\/div\u003e","brand":"Lunt Solar Systems","offers":[{"title":"LS6CaKMDd 6mm, 2\" Star Diagonal","offer_id":53917532979311,"sku":"LS6CaKMDd","price":895.99,"currency_code":"USD","in_stock":true},{"title":"LS6CaKMDs 6mm, 2\" Straight Through","offer_id":53917533012079,"sku":"LS6CaKMDs","price":895.99,"currency_code":"USD","in_stock":true},{"title":"LS12CaKMDd 12mm, 2\" Star Diagonal","offer_id":53917533044847,"sku":"LS12CaKMDd","price":1495.99,"currency_code":"USD","in_stock":true},{"title":"LS12CaKMDs 12mm, 2\" Straight Through","offer_id":53917533077615,"sku":"LS12CaKMDs","price":1495.99,"currency_code":"USD","in_stock":true},{"title":"LS18CaKMDd 18mm, 2\" Star Diagonal","offer_id":53917533110383,"sku":"LS18CaKMDd","price":1695.99,"currency_code":"USD","in_stock":true},{"title":"LS18CaKMDs 18mm, 2\" Straight Through","offer_id":53917533143151,"sku":"LS18CaKMDs","price":1695.99,"currency_code":"USD","in_stock":true},{"title":"LS130TCaKMD Herschel Wedge, filter only","offer_id":53917533175919,"sku":"LS130TCaKMD","price":1995.99,"currency_code":"USD","in_stock":true},{"title":"LS130TCaKMD Herschel Wedge with LS130MT backing plate","offer_id":53917533208687,"sku":"LS130TCaKMD-BP","price":2149.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0717\/7968\/0367\/files\/CaK-Blocking-Filter-Ck-Diagonal-Profile-Lunt-Solar-Telescope-1.jpg?v=1785527446"},{"product_id":"lunt-double-stack-etalon-filter-for-mt-telescopes","title":"Lunt Double Stack Etalon Filter for MT Telescopes","description":"\u003cdiv class=\"kt-page\"\u003e\n\n\u003cstyle\u003e\n.kt-page{--kt-primary:#030B1C;--kt-accent:#2E7FBF;max-width:1100px;margin:0 auto;font-family:inherit;}\n.kt-page.kt-page--wide{max-width:1600px;}\n.kt-page .kt-hero{display:flex;align-items:center;gap:40px;margin-bottom:40px;}\n.kt-page .kt-hero-copy{flex:1 1 55%;}\n.kt-page .kt-hero-img{flex:1 1 40%;text-align:center;}\n.kt-page .kt-sq{width:100%;max-width:420px;aspect-ratio:1\/1;margin:0 auto;background:#ffffff;border-radius:6px;display:flex;align-items:center;justify-content:center;overflow:hidden;}\n.kt-page .kt-sq img{max-width:92%;max-height:92%;width:auto;height:auto;object-fit:contain;}\n.kt-page .kt-hero-copy h2{font-size:26px;margin-bottom:14px;}\n.kt-page .kt-hero-copy p{font-size:16px;line-height:1.6;margin-bottom:14px;}\n.kt-page .kt-features{display:flex;align-items:flex-start;gap:40px;margin:40px 0;}\n.kt-page .kt-features-copy{flex:1 1 55%;}\n.kt-page .kt-features-img{flex:1 1 40%;text-align:center;}\n.kt-page .kt-section-heading{font-size:21px;display:inline-block;padding-bottom:8px;border-bottom:2px solid var(--kt-accent);margin-bottom:18px;}\n.kt-page .kt-feature-list{list-style:none;margin:0;padding:0;}\n.kt-page .kt-feature-list li{font-size:16px;line-height:1.5;margin-bottom:12px;padding-left:26px;position:relative;}\n.kt-page .kt-feature-list li:before{content:\"\\2713\";color:var(--kt-accent);font-weight:bold;position:absolute;left:0;}\n.kt-page .kt-feature-list b{color:#222;}\n.kt-page .kt-specs-wrap{box-sizing:border-box;}\n.kt-page .kt-specs{display:table !important;width:100% !important;border-collapse:collapse;margin:40px 0;font-size:15px;}\n.kt-page .kt-specs th,.kt-page .kt-specs td{border:2px solid #000;padding:10px 12px;text-align:left;}\n.kt-page .kt-specs th{background:var(--kt-primary) !important;color:#fff !important;font-size:16px;}\n.kt-page .kt-specs tr:nth-child(even){background:#f2f2f2;}\n.kt-page .kt-specs tr:nth-child(odd){background:#ffffff;}\n.kt-page .kt-cta{text-align:center;margin:40px 0;font-size:18px;font-weight:bold;}\n.kt-page .kt-cta-buttons{display:flex;justify-content:center;gap:16px;margin-top:16px;flex-wrap:wrap;}\n.kt-page .kt-cta-buttons a{display:inline-block;padding:12px 26px;border:2px solid var(--kt-primary);border-radius:4px;color:var(--kt-primary);text-decoration:none;font-weight:bold;font-size:15px;transition:all .15s ease;}\n.kt-page .kt-cta-buttons a:hover{background:var(--kt-primary);color:#fff;}\n.kt-page .kt-manuals a{display:block;color:var(--kt-primary);font-weight:bold;font-size:30px;text-align:left;text-decoration:none;margin-bottom:10px;}\n.kt-page .kt-manuals a:hover{color:var(--kt-accent);}\n@media (max-width:768px){\n  .kt-page .kt-hero,.kt-page .kt-features{flex-direction:column;}\n  .kt-page .kt-hero-img img,.kt-page .kt-features-img img{max-width:400px;}\n  .kt-page .kt-hero-copy p,.kt-page .kt-features-copy p{font-size:17px;}\n  .kt-page .kt-cta-buttons{display:grid;grid-template-columns:1fr 1fr;gap:12px;}\n  .kt-page .kt-cta-buttons a:nth-child(3){grid-column:1 \/ span 2;}\n  .kt-page .kt-manuals a{font-size:24px;}\n}\n\u003c\/style\u003e\n\n\u003cdiv class=\"kt-hero\"\u003e\n  \u003cdiv class=\"kt-hero-copy\"\u003e\n    \u003ch2\u003eNarrow The Bandwidth On Your MT Telescope\u003c\/h2\u003e\n        \u003cp\u003eA double stack etalon puts a second filter in series with the etalon already in your Lunt MT telescope. Single stack gives you 0.7 Angstrom or better. Adding the second etalon takes the system to 0.5 Angstrom or better, and Lunt reports tighter figures near 0.28 Angstrom on current internal modules. Contrast on the disk climbs sharply.\u003c\/p\u003e\n    \u003cp\u003eChoose the version that matches your telescope. The LS50FHaP and LS60FHa front mount on the LS60MT and LS60THa. The internal SFPT module drops inside the LS80MT and LS100MT. The LS130MTP module serves the LS130MT. The LS100FHa front mount covers the LS100MT and LS100THa. Each one leaves the night sky configuration untouched.\u003c\/p\u003e\n    \u003cp\u003eAt the narrower bandwidth you see filaments resolve into dark cores and multiple strands, plage boundaries sharpen into cellular networks, and active regions show more magnetic structure. The trade is brightness, so plan on lower magnification or longer exposures. Pressure tuning shifts the passband on and off band without tilting the etalon, and the internal modules install without a factory return.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"kt-hero-img\"\u003e\n    \u003cdiv class=\"kt-sq\"\u003e\n      \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0615\/8273\/7521\/files\/DS2-80-Double-Stack-Filter-Lunt-Solar-Telescope.jpg?v=1743113214\" alt=\"Lunt SFPT internal double stack etalon module for the LS80MT and LS100MT universal telescopes\"\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"kt-features\"\u003e\n  \u003cdiv class=\"kt-features-copy\"\u003e\n    \u003ch3 class=\"kt-section-heading\"\u003eKey Features\u003c\/h3\u003e\n    \u003cul class=\"kt-feature-list\"\u003e\n      \u003cli\u003e\n\u003cb\u003eSecond Etalon In Series\u003c\/b\u003e - stacks a second precision etalon with the one already in your telescope to cut the combined bandwidth.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cb\u003e0.5 Angstrom Or Better\u003c\/b\u003e - takes a 0.7 Angstrom single stack system down to 0.5 Angstrom or better, with Lunt quoting under 0.28 Angstrom for the current internal modules.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cb\u003eFront Mount Or Internal\u003c\/b\u003e - arrives as a front mounted filter for 60mm and 100mm class systems, or as an internal module for the 80mm, 100mm and 130mm tubes.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cb\u003eDoppler True Pressure Tuning\u003c\/b\u003e - shifts the passband on and off band without tilting the etalon, and the internal SFPT adds a second independent tuning knob.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cb\u003eCustomer Installed\u003c\/b\u003e - fits without a factory return, so the double stack can be added at purchase or at any point afterward.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cb\u003eNight Sky Unaffected\u003c\/b\u003e - leaves the telescope in its night configuration once the solar module comes out for deep sky use.\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"kt-features-img\"\u003e\n    \u003cdiv class=\"kt-sq\"\u003e\n      \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0615\/8273\/7521\/files\/Double-Stack-Filter-60F-Lunt-Solar-Telescope.jpg?v=1743112794\" alt=\"Lunt LS60FHa 60mm front mounted double stack hydrogen alpha filter fitted to a Lunt solar telescope\"\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"kt-specs-wrap\"\u003e\n\u003ctable class=\"kt-specs\"\u003e\n  \u003ctr\u003e\u003cth colspan=\"2\"\u003eSpecifications\u003c\/th\u003e\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eModel \/ SKU\u003c\/td\u003e\n\u003ctd\u003eLS50FHaP, LS60FHa, DSII\/SFPTP, DSII\/LS130MTP, LS100FHa\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003edouble stack hydrogen alpha etalon filter for Lunt MT and THa telescopes\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eLS50FHaP 50mm\u003c\/td\u003e\n\u003ctd\u003efront mounted 50mm etalon, fits the LS60MT and LS60THa\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eLS60FHa 60mm\u003c\/td\u003e\n\u003ctd\u003efront mounted 60mm etalon, fits the LS60MT and LS60THa\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eDSII\/SFPTP Internal\u003c\/td\u003e\n\u003ctd\u003esmall format internal module, fits the LS80MT and LS100MT\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eDSII\/LS130MTP Internal\u003c\/td\u003e\n\u003ctd\u003einternal module, fits the LS130MT\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eLS100FHa 100mm\u003c\/td\u003e\n\u003ctd\u003efront mounted 100mm etalon, fits the LS100MT and LS100THa\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eClear Aperture\u003c\/td\u003e\n\u003ctd\u003e50mm, 60mm or 100mm on the front mounted versions with no central obstruction, matched to the host telescope on the internal modules\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eBandwidth\u003c\/td\u003e\n\u003ctd\u003e0.5 Angstrom or better combined, with Lunt publishing under 0.28 Angstrom for the current SFPT and LS130 internal modules\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eSingle Etalon Bandpass\u003c\/td\u003e\n\u003ctd\u003e0.4 Angstrom on the LS50FHa, LS60FHa, SFPT and LS130 modules as published by Lunt\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eTuning\u003c\/td\u003e\n\u003ctd\u003eLunt Pressure Tuning on the internal modules with dual independent knobs on the SFPT, tilt tuning on the front mounted etalons\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eBlocking Filter\u003c\/td\u003e\n\u003ctd\u003erequired at all times, sold separately\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eMounting\u003c\/td\u003e\n\u003ctd\u003ethreads or clamps to the front cell on the front mounted versions, installs inside the optical path on the internal modules\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003eLS50FHa 10 lb shipping, LS60FHa 11 lb shipping, SFPT module 7 lb shipping, LS130 module 7 lb shipping, LS100FHa Not published\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eWhat's Included\u003c\/td\u003e\n\u003ctd\u003eetalon filter assembly and aluminium hard case with fitted foam on the front mounted versions\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e5 years from date of purchase against manufacturing and workmanship defects\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\n\n\u003cp class=\"kt-cta\"\u003e\n  Talk to a Specialist\n  \u003cspan class=\"kt-cta-buttons\"\u003e\n    \u003ca href=\"\/pages\/contact\" style=\"display:inline-block;padding:12px 26px;border:2px solid var(--kt-primary);border-radius:4px;color:var(--kt-primary);text-decoration:none;font-weight:bold;\"\u003eContact Us\u003c\/a\u003e\n    \u003ca href=\"mailto:sales@telescopedepot.com\" style=\"display:inline-block;padding:12px 26px;border:2px solid var(--kt-primary);border-radius:4px;color:var(--kt-primary);text-decoration:none;font-weight:bold;\"\u003eEmail a Specialist\u003c\/a\u003e\n    \u003ca href=\"\/pages\/shipping\" style=\"display:inline-block;padding:12px 26px;border:2px solid var(--kt-primary);border-radius:4px;color:var(--kt-primary);text-decoration:none;font-weight:bold;\"\u003eShipping Info\u003c\/a\u003e\n  \u003c\/span\u003e\n\u003c\/p\u003e\n\n\u003c\/div\u003e","brand":"Lunt Solar Systems","offers":[{"title":"LS50FHaP 50mm (LS60MT, LS60THa)","offer_id":53917549822063,"sku":"LS50FHaP","price":1145.99,"currency_code":"USD","in_stock":true},{"title":"LS60FHa 60mm (LS60MT, LS60THa)","offer_id":53917549854831,"sku":"LS60FHa","price":1495.99,"currency_code":"USD","in_stock":true},{"title":"DSII\/SFPTP Internal (LS80MT, LS100MT)","offer_id":53917549887599,"sku":"DSII\/SFPTP","price":1495.99,"currency_code":"USD","in_stock":true},{"title":"DSII\/LS130MTP Internal Module (LS130MT)","offer_id":53917549920367,"sku":"DSII\/LS130MTP","price":2995.99,"currency_code":"USD","in_stock":true},{"title":"LS100FHa 100mm (LS100MT, LS100THa)","offer_id":53917549953135,"sku":"LS100FHa","price":4495.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0717\/7968\/0367\/files\/DS2-80-Double-Stack-Filter-Lunt-Solar-Telescope.jpg?v=1785527455"},{"product_id":"lunt-white-light-solar-wedge","title":"Lunt White Light Solar Wedge","description":"\u003cdiv class=\"kt-page\"\u003e\n\n\u003cstyle\u003e\n.kt-page{--kt-primary:#030B1C;--kt-accent:#2E7FBF;max-width:1100px;margin:0 auto;font-family:inherit;}\n.kt-page.kt-page--wide{max-width:1600px;}\n.kt-page .kt-hero{display:flex;align-items:center;gap:40px;margin-bottom:40px;}\n.kt-page .kt-hero-copy{flex:1 1 55%;}\n.kt-page .kt-hero-img{flex:1 1 40%;text-align:center;}\n.kt-page .kt-sq{width:100%;max-width:420px;aspect-ratio:1\/1;margin:0 auto;background:#ffffff;border-radius:6px;display:flex;align-items:center;justify-content:center;overflow:hidden;}\n.kt-page .kt-sq img{max-width:92%;max-height:92%;width:auto;height:auto;object-fit:contain;}\n.kt-page .kt-hero-copy h2{font-size:26px;margin-bottom:14px;}\n.kt-page .kt-hero-copy p{font-size:16px;line-height:1.6;margin-bottom:14px;}\n.kt-page .kt-features{display:flex;align-items:flex-start;gap:40px;margin:40px 0;}\n.kt-page .kt-features-copy{flex:1 1 55%;}\n.kt-page .kt-features-img{flex:1 1 40%;text-align:center;}\n.kt-page .kt-section-heading{font-size:21px;display:inline-block;padding-bottom:8px;border-bottom:2px solid var(--kt-accent);margin-bottom:18px;}\n.kt-page .kt-feature-list{list-style:none;margin:0;padding:0;}\n.kt-page .kt-feature-list li{font-size:16px;line-height:1.5;margin-bottom:12px;padding-left:26px;position:relative;}\n.kt-page .kt-feature-list li:before{content:\"\\2713\";color:var(--kt-accent);font-weight:bold;position:absolute;left:0;}\n.kt-page .kt-feature-list b{color:#222;}\n.kt-page .kt-specs-wrap{box-sizing:border-box;}\n.kt-page .kt-specs{display:table !important;width:100% !important;border-collapse:collapse;margin:40px 0;font-size:15px;}\n.kt-page .kt-specs th,.kt-page .kt-specs td{border:2px solid #000;padding:10px 12px;text-align:left;}\n.kt-page .kt-specs th{background:var(--kt-primary) !important;color:#fff !important;font-size:16px;}\n.kt-page .kt-specs tr:nth-child(even){background:#f2f2f2;}\n.kt-page .kt-specs tr:nth-child(odd){background:#ffffff;}\n.kt-page .kt-cta{text-align:center;margin:40px 0;font-size:18px;font-weight:bold;}\n.kt-page .kt-cta-buttons{display:flex;justify-content:center;gap:16px;margin-top:16px;flex-wrap:wrap;}\n.kt-page .kt-cta-buttons a{display:inline-block;padding:12px 26px;border:2px solid var(--kt-primary);border-radius:4px;color:var(--kt-primary);text-decoration:none;font-weight:bold;font-size:15px;transition:all .15s ease;}\n.kt-page .kt-cta-buttons a:hover{background:var(--kt-primary);color:#fff;}\n.kt-page .kt-manuals a{display:block;color:var(--kt-primary);font-weight:bold;font-size:30px;text-align:left;text-decoration:none;margin-bottom:10px;}\n.kt-page .kt-manuals a:hover{color:var(--kt-accent);}\n@media (max-width:768px){\n  .kt-page .kt-hero,.kt-page .kt-features{flex-direction:column;}\n  .kt-page .kt-hero-img img,.kt-page .kt-features-img img{max-width:400px;}\n  .kt-page .kt-hero-copy p,.kt-page .kt-features-copy p{font-size:17px;}\n  .kt-page .kt-cta-buttons{display:grid;grid-template-columns:1fr 1fr;gap:12px;}\n  .kt-page .kt-cta-buttons a:nth-child(3){grid-column:1 \/ span 2;}\n  .kt-page .kt-manuals a{font-size:24px;}\n}\n\u003c\/style\u003e\n\n\u003cdiv class=\"kt-hero\"\u003e\n  \u003cdiv class=\"kt-hero-copy\"\u003e\n    \u003ch2\u003eSafe White Light Views Of The Photosphere\u003c\/h2\u003e\n        \u003cp\u003eThis white light solar wedge from Lunt is a Herschel design that diverts the vast majority of incoming sunlight out the back of the housing, sending only a small, safe fraction to your eyepiece. A built in ND3 filter completes the light reduction, so you get high contrast views of the photosphere, sunspots and granulation.\u003c\/p\u003e\n    \u003cp\u003eUse this wedge on refractors only. Never fit it to a catadioptric or reflecting telescope, where trapped heat can damage the instrument and injure you. The 1.25 inch model performs best on refractors up to 4 inches of aperture, and the 2 inch model performs best on refractors of 6 inches or less.\u003c\/p\u003e\n    \u003cp\u003eEach wedge ships with the ND3 filter pre installed, a carrying case and die cut foam with room for accessories. If you can reach focus with a standard star diagonal on your night time refractor, you will reach focus here too. Add a Lunt polarizing filter to dim the image further for comfortable visual observing.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"kt-hero-img\"\u003e\n    \u003cdiv class=\"kt-sq\"\u003e\n      \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0615\/8273\/7521\/files\/White-Light-Solar-Wedges-1-e1539710721773.jpg?v=1743112806\" alt=\"Lunt White Light Solar Wedge with black anodized body and eyepiece holder\"\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"kt-features\"\u003e\n  \u003cdiv class=\"kt-features-copy\"\u003e\n    \u003ch3 class=\"kt-section-heading\"\u003eKey Features\u003c\/h3\u003e\n    \u003cul class=\"kt-feature-list\"\u003e\n      \u003cli\u003e\n\u003cb\u003eRefractors Only\u003c\/b\u003e - never mount this wedge on a catadioptric or reflecting telescope, as trapped heat can damage optics and cause injury.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cb\u003eBuilt In ND3\u003c\/b\u003e - the neutral density 3 filter is installed at the factory, giving safe white light imaging and visual observing straight out of the box.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cb\u003eTwo Barrel Sizes\u003c\/b\u003e - choose a 1.25 inch barrel for refractors up to 4 inches or a 2 inch barrel for refractors of 6 inches or less.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cb\u003eHigh Contrast Detail\u003c\/b\u003e - resolves sunspot umbra and penumbra plus surface granulation across the photosphere.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cb\u003eFocus Compatible\u003c\/b\u003e - reaches focus wherever a standard star diagonal does on the same refractor, so existing imaging trains carry over.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cb\u003eCase Included\u003c\/b\u003e - a carrying case with die cut foam holds the wedge and leaves room for eyepieces and filters.\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"kt-features-img\"\u003e\n    \u003cdiv class=\"kt-sq\"\u003e\n      \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0615\/8273\/7521\/files\/White-Light-Solar-Wedges-3-e1539710746550.jpg?v=1743112807\" alt=\"Alternate view of the Lunt White Light Solar Wedge showing the barrel and housing\"\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"kt-specs-wrap\"\u003e\n\u003ctable class=\"kt-specs\"\u003e\n  \u003ctr\u003e\u003cth colspan=\"2\"\u003eSpecifications\u003c\/th\u003e\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eHerschel wedge for white light solar observing\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eModel \/ SKU\u003c\/td\u003e\n\u003ctd\u003eLS1.25HW (1.25 inch), LS2HW (2 inch)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e1.25 inch model\u003c\/td\u003e\n\u003ctd\u003e1.25 inch barrel and 1.25 inch eyepiece holder, best on refractors up to 4 inch aperture\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e2 inch model\u003c\/td\u003e\n\u003ctd\u003e2 inch barrel and 2 inch eyepiece holder, best on refractors 6 inch aperture or less\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eBuilt in filter\u003c\/td\u003e\n\u003ctd\u003eND3 neutral density, pre installed\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eTelescope compatibility\u003c\/td\u003e\n\u003ctd\u003eRefractors only, never catadioptric or reflecting telescopes\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eSolar features shown\u003c\/td\u003e\n\u003ctd\u003ePhotosphere, sunspots, granulation\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eIncluded in package\u003c\/td\u003e\n\u003ctd\u003eWedge, ND3 filter, carrying case, die cut foam\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eRecommended accessory\u003c\/td\u003e\n\u003ctd\u003eLunt polarizing filter, PF1.25 or PF-2, to dim the image for visual use\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eFocus travel\u003c\/td\u003e\n\u003ctd\u003eMatches a standard star diagonal on the same refractor\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eOptical coatings\u003c\/td\u003e\n\u003ctd\u003eNot published\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eShipping weight\u003c\/td\u003e\n\u003ctd\u003e4 lb per unit\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e5 years from date of purchase, original purchaser, manufacturing and workmanship defects\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"kt-manuals\"\u003e\n\u003ch6\u003eManuals\u003c\/h6\u003e\n\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0615\/8273\/7521\/files\/White_Light_Solar_Wedge_Manual_Revised.pdf?v=1748274315\" style=\"display:block;color:var(--kt-primary);font-weight:bold;font-size:30px;text-align:left;text-decoration:none;margin-bottom:10px;\" target=\"_blank\" rel=\"noopener\"\u003eProduct Manual (PDF)\u003c\/a\u003e\n\u003c\/div\u003e\n\n\u003cp class=\"kt-cta\"\u003e\n  Talk to a Specialist\n  \u003cspan class=\"kt-cta-buttons\"\u003e\n    \u003ca href=\"\/pages\/contact\" style=\"display:inline-block;padding:12px 26px;border:2px solid var(--kt-primary);border-radius:4px;color:var(--kt-primary);text-decoration:none;font-weight:bold;\"\u003eContact Us\u003c\/a\u003e\n    \u003ca href=\"mailto:sales@telescopedepot.com\" style=\"display:inline-block;padding:12px 26px;border:2px solid var(--kt-primary);border-radius:4px;color:var(--kt-primary);text-decoration:none;font-weight:bold;\"\u003eEmail a Specialist\u003c\/a\u003e\n    \u003ca href=\"\/pages\/shipping\" style=\"display:inline-block;padding:12px 26px;border:2px solid var(--kt-primary);border-radius:4px;color:var(--kt-primary);text-decoration:none;font-weight:bold;\"\u003eShipping Info\u003c\/a\u003e\n  \u003c\/span\u003e\n\u003c\/p\u003e\n\n\u003c\/div\u003e","brand":"Lunt Solar Systems","offers":[{"title":"1.25 inch","offer_id":53917550084207,"sku":"LS1.25HW","price":275.99,"currency_code":"USD","in_stock":true},{"title":"2 inch","offer_id":53917550116975,"sku":"LS2HW","price":375.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0717\/7968\/0367\/files\/White-Light-Solar-Wedges-1-e1539710721773.jpg?v=1785527456"},{"product_id":"lunt-50mm-full-aperture-h-alpha-etalon-filter-set","title":"Lunt 50mm Full Aperture H-Alpha Etalon Filter Set","description":"\u003cdiv class=\"kt-page\"\u003e\n\n\u003cstyle\u003e\n.kt-page{--kt-primary:#030B1C;--kt-accent:#2E7FBF;max-width:1100px;margin:0 auto;font-family:inherit;}\n.kt-page.kt-page--wide{max-width:1600px;}\n.kt-page .kt-hero{display:flex;align-items:center;gap:40px;margin-bottom:40px;}\n.kt-page .kt-hero-copy{flex:1 1 55%;}\n.kt-page .kt-hero-img{flex:1 1 40%;text-align:center;}\n.kt-page .kt-sq{width:100%;max-width:420px;aspect-ratio:1\/1;margin:0 auto;background:#ffffff;border-radius:6px;display:flex;align-items:center;justify-content:center;overflow:hidden;}\n.kt-page .kt-sq img{max-width:92%;max-height:92%;width:auto;height:auto;object-fit:contain;}\n.kt-page .kt-hero-copy h2{font-size:26px;margin-bottom:14px;}\n.kt-page .kt-hero-copy p{font-size:16px;line-height:1.6;margin-bottom:14px;}\n.kt-page .kt-features{display:flex;align-items:flex-start;gap:40px;margin:40px 0;}\n.kt-page .kt-features-copy{flex:1 1 55%;}\n.kt-page .kt-features-img{flex:1 1 40%;text-align:center;}\n.kt-page .kt-section-heading{font-size:21px;display:inline-block;padding-bottom:8px;border-bottom:2px solid var(--kt-accent);margin-bottom:18px;}\n.kt-page .kt-feature-list{list-style:none;margin:0;padding:0;}\n.kt-page .kt-feature-list li{font-size:16px;line-height:1.5;margin-bottom:12px;padding-left:26px;position:relative;}\n.kt-page .kt-feature-list li:before{content:\"\\2713\";color:var(--kt-accent);font-weight:bold;position:absolute;left:0;}\n.kt-page .kt-feature-list b{color:#222;}\n.kt-page .kt-specs-wrap{box-sizing:border-box;}\n.kt-page .kt-specs{display:table !important;width:100% !important;border-collapse:collapse;margin:40px 0;font-size:15px;}\n.kt-page .kt-specs th,.kt-page .kt-specs td{border:2px solid #000;padding:10px 12px;text-align:left;}\n.kt-page .kt-specs th{background:var(--kt-primary) !important;color:#fff !important;font-size:16px;}\n.kt-page .kt-specs tr:nth-child(even){background:#f2f2f2;}\n.kt-page .kt-specs tr:nth-child(odd){background:#ffffff;}\n.kt-page .kt-cta{text-align:center;margin:40px 0;font-size:18px;font-weight:bold;}\n.kt-page .kt-cta-buttons{display:flex;justify-content:center;gap:16px;margin-top:16px;flex-wrap:wrap;}\n.kt-page .kt-cta-buttons a{display:inline-block;padding:12px 26px;border:2px solid var(--kt-primary);border-radius:4px;color:var(--kt-primary);text-decoration:none;font-weight:bold;font-size:15px;transition:all .15s ease;}\n.kt-page .kt-cta-buttons a:hover{background:var(--kt-primary);color:#fff;}\n.kt-page .kt-manuals a{display:block;color:var(--kt-primary);font-weight:bold;font-size:30px;text-align:left;text-decoration:none;margin-bottom:10px;}\n.kt-page .kt-manuals a:hover{color:var(--kt-accent);}\n@media (max-width:768px){\n  .kt-page .kt-hero,.kt-page .kt-features{flex-direction:column;}\n  .kt-page .kt-hero-img img,.kt-page .kt-features-img img{max-width:400px;}\n  .kt-page .kt-hero-copy p,.kt-page .kt-features-copy p{font-size:17px;}\n  .kt-page .kt-cta-buttons{display:grid;grid-template-columns:1fr 1fr;gap:12px;}\n  .kt-page .kt-cta-buttons a:nth-child(3){grid-column:1 \/ span 2;}\n  .kt-page .kt-manuals a{font-size:24px;}\n}\n\u003c\/style\u003e\n\n\u003cdiv class=\"kt-hero\"\u003e\n  \u003cdiv class=\"kt-hero-copy\"\u003e\n    \u003ch2\u003eFull Aperture 50mm Etalon For Your Refractor\u003c\/h2\u003e\n        \u003cp\u003eThis 50mm full aperture H-alpha etalon package from Lunt puts an unobstructed 50mm tilt tuned etalon in front of your refractor. Every etalon is individually tested on Lunt metrology equipment and rated at 0.4 Angstrom, so the bandpass on your unit is verified rather than estimated. Prominences, filaments and active region structure all show clearly.\u003c\/p\u003e\n    \u003cp\u003eUnlike the center obstructed sets, the full 50mm aperture stays clear, which helps resolution and evenness of illumination across the disc. Tilt tuning shifts the passband across the hydrogen alpha line at 656.28 nm, and the filter lifts off in seconds so the same refractor returns to night sky work after sunset.\u003c\/p\u003e\n    \u003cp\u003eThe filter set is specified with a blocking filter matched to your focuser and focal length, in either a 2 inch or a 1.25 inch fitting. A B600 suits focal lengths to 540 mm, a B1200 to 1080 mm visually, a B1800 to 1620 mm, and a B3400 covers the longest focal lengths and large sensor full disc imaging.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"kt-hero-img\"\u003e\n    \u003cdiv class=\"kt-sq\"\u003e\n      \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0615\/8273\/7521\/files\/Double-Stack-Filter-50F-Vertical.png?v=1743112801\" alt=\"Lunt LS50FHa 50mm front mount full aperture hydrogen alpha etalon filter standing vertically\"\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"kt-features\"\u003e\n  \u003cdiv class=\"kt-features-copy\"\u003e\n    \u003ch3 class=\"kt-section-heading\"\u003eKey Features\u003c\/h3\u003e\n    \u003cul class=\"kt-feature-list\"\u003e\n      \u003cli\u003e\n\u003cb\u003eVerified Bandpass\u003c\/b\u003e - each etalon is tested individually and rated at 0.4 Angstrom rather than estimated\u003c\/li\u003e\n      \u003cli\u003e\n\u003cb\u003eFull Aperture\u003c\/b\u003e - the 50mm clear aperture has no central obstruction from a support foot\u003c\/li\u003e\n      \u003cli\u003e\n\u003cb\u003eTilt Tuned\u003c\/b\u003e - angle the housing to centre the passband on the 656.28 nm line\u003c\/li\u003e\n      \u003cli\u003e\n\u003cb\u003eBlocking Filter Sizes\u003c\/b\u003e - supplied as B600, B1200, B1800 or B3400 to suit your focal length\u003c\/li\u003e\n      \u003cli\u003e\n\u003cb\u003eFocuser Fit\u003c\/b\u003e - the trailing 2 or 1 in the code sets a 2 inch or 1.25 inch blocking filter fitting\u003c\/li\u003e\n      \u003cli\u003e\n\u003cb\u003eDouble Stack Ready\u003c\/b\u003e - pairs with a Lunt LS60MT in series for a combined bandpass under 0.28 Angstrom\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"kt-features-img\"\u003e\n    \u003cdiv class=\"kt-sq\"\u003e\n      \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0615\/8273\/7521\/files\/Double-Stack-Filter-50F-3qt-Front.png?v=1743112801\" alt=\"Three quarter front view of the Lunt LS50FHa 50mm front mount etalon filter housing\"\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"kt-specs-wrap\"\u003e\n\u003ctable class=\"kt-specs\"\u003e\n  \u003ctr\u003e\u003cth colspan=\"2\"\u003eSpecifications\u003c\/th\u003e\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eFront mounted full aperture hydrogen alpha etalon filter set\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eEtalon Aperture\u003c\/td\u003e\n\u003ctd\u003e50 mm, no central obstruction\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eWavelength\u003c\/td\u003e\n\u003ctd\u003eHydrogen alpha, 656.28 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eSingle Etalon Bandpass\u003c\/td\u003e\n\u003ctd\u003e0.4 Angstrom, individually verified\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eDouble Stack Bandpass\u003c\/td\u003e\n\u003ctd\u003eLess than 0.28 Angstrom in series with the LS60MT internal pressure tuned etalon\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eTuning\u003c\/td\u003e\n\u003ctd\u003eTilt tuned\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eB600 Blocking Filter\u003c\/td\u003e\n\u003ctd\u003e6 mm clear aperture, visual use to 540 mm focal length\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eB1200 Blocking Filter\u003c\/td\u003e\n\u003ctd\u003e12 mm clear aperture, visual to 1080 mm and imaging to 540 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eB1800 Blocking Filter\u003c\/td\u003e\n\u003ctd\u003e18 mm clear aperture, visual to 1620 mm and imaging to 1080 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eB3400 Blocking Filter\u003c\/td\u003e\n\u003ctd\u003e34 mm clear aperture, visual to 3400 mm and imaging to 1800 mm, 2 inch straight through tube only\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eFocuser Fitting\u003c\/td\u003e\n\u003ctd\u003eCodes ending in 2 supply a 2 inch blocking filter, codes ending in 1 supply 1.25 inch\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eBlocking Filter Required\u003c\/td\u003e\n\u003ctd\u003eYes, a Lunt blocking filter must remain in the optical path at all times\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eStorage\u003c\/td\u003e\n\u003ctd\u003eAluminium hard case with fitted foam\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eFilter Weight\u003c\/td\u003e\n\u003ctd\u003eLunt lists approximately 2 lb for the etalon assembly\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eStorefront Listing\u003c\/td\u003e\n\u003ctd\u003ePublished as Lunt LS50FHa Front Mount 50mm Double Stack Solar Filter, etalon only, blocking filter sold separately\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eModel \/ SKU\u003c\/td\u003e\n\u003ctd\u003eLS50FHa2\/B600, LS50FHa1\/B600, LS50FHa2\/B1200, LS50FHa1\/B1200, LS50FHa2\/B1800, LS50FHa1\/B1800, LS50FHa2\/B3400\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eShipping Weight\u003c\/td\u003e\n\u003ctd\u003e10 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e5 years from date of purchase, original purchaser, manufacturing and workmanship defects\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"kt-manuals\"\u003e\n\u003ch6\u003eManuals\u003c\/h6\u003e\n\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0615\/8273\/7521\/files\/LS50FHa_Manual.pdf?v=1748274315\" style=\"display:block;color:var(--kt-primary);font-weight:bold;font-size:30px;text-align:left;text-decoration:none;margin-bottom:10px;\" target=\"_blank\" rel=\"noopener\"\u003eProduct Manual (PDF)\u003c\/a\u003e\n\u003c\/div\u003e\n\n\u003cp class=\"kt-cta\"\u003e\n  Talk to a Specialist\n  \u003cspan class=\"kt-cta-buttons\"\u003e\n    \u003ca href=\"\/pages\/contact\" style=\"display:inline-block;padding:12px 26px;border:2px solid var(--kt-primary);border-radius:4px;color:var(--kt-primary);text-decoration:none;font-weight:bold;\"\u003eContact Us\u003c\/a\u003e\n    \u003ca href=\"mailto:sales@telescopedepot.com\" style=\"display:inline-block;padding:12px 26px;border:2px solid var(--kt-primary);border-radius:4px;color:var(--kt-primary);text-decoration:none;font-weight:bold;\"\u003eEmail a Specialist\u003c\/a\u003e\n    \u003ca href=\"\/pages\/shipping\" style=\"display:inline-block;padding:12px 26px;border:2px solid var(--kt-primary);border-radius:4px;color:var(--kt-primary);text-decoration:none;font-weight:bold;\"\u003eShipping Info\u003c\/a\u003e\n  \u003c\/span\u003e\n\u003c\/p\u003e\n\n\u003c\/div\u003e","brand":"Lunt Solar Systems","offers":[{"title":"B600 \/ 2\" Focuser","offer_id":53917560832111,"sku":"LS50FHa2\/B600","price":1495.99,"currency_code":"USD","in_stock":true},{"title":"B600 \/ 1.25\" Focuser","offer_id":53917560864879,"sku":"LS50FHa1\/B600","price":1495.99,"currency_code":"USD","in_stock":true},{"title":"B1200 \/ 2\" Focuser","offer_id":53917560897647,"sku":"LS50FHa2\/B1200","price":1695.99,"currency_code":"USD","in_stock":true},{"title":"B1200 \/ 1.25\" Focuser","offer_id":53917560930415,"sku":"LS50FHa1\/B1200","price":1695.99,"currency_code":"USD","in_stock":true},{"title":"B1800 \/ 2\" Focuser","offer_id":53917560963183,"sku":"LS50FHa2\/B1800","price":1895.99,"currency_code":"USD","in_stock":true},{"title":"B1800 \/ 1.25\" Focuser","offer_id":53917560995951,"sku":"LS50FHa1\/B1800","price":1895.99,"currency_code":"USD","in_stock":true},{"title":"B3400 \/ 2\" Focuser","offer_id":53917561028719,"sku":"LS50FHa2\/B3400","price":3695.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0717\/7968\/0367\/files\/Double-Stack-Filter-50F-Vertical.png?v=1785527459"},{"product_id":"lunt-polarizing-filter-unit","title":"Lunt Polarizing Filter Unit","description":"\u003cdiv class=\"kt-page\"\u003e\n\n\u003cstyle\u003e\n.kt-page{--kt-primary:#030B1C;--kt-accent:#2E7FBF;max-width:1100px;margin:0 auto;font-family:inherit;}\n.kt-page.kt-page--wide{max-width:1600px;}\n.kt-page .kt-hero{display:flex;align-items:center;gap:40px;margin-bottom:40px;}\n.kt-page .kt-hero-copy{flex:1 1 55%;}\n.kt-page .kt-hero-img{flex:1 1 40%;text-align:center;}\n.kt-page .kt-sq{width:100%;max-width:420px;aspect-ratio:1\/1;margin:0 auto;background:#ffffff;border-radius:6px;display:flex;align-items:center;justify-content:center;overflow:hidden;}\n.kt-page .kt-sq img{max-width:92%;max-height:92%;width:auto;height:auto;object-fit:contain;}\n.kt-page .kt-hero-copy h2{font-size:26px;margin-bottom:14px;}\n.kt-page .kt-hero-copy p{font-size:16px;line-height:1.6;margin-bottom:14px;}\n.kt-page .kt-features{display:flex;align-items:flex-start;gap:40px;margin:40px 0;}\n.kt-page .kt-features-copy{flex:1 1 55%;}\n.kt-page .kt-features-img{flex:1 1 40%;text-align:center;}\n.kt-page .kt-section-heading{font-size:21px;display:inline-block;padding-bottom:8px;border-bottom:2px solid var(--kt-accent);margin-bottom:18px;}\n.kt-page .kt-feature-list{list-style:none;margin:0;padding:0;}\n.kt-page .kt-feature-list li{font-size:16px;line-height:1.5;margin-bottom:12px;padding-left:26px;position:relative;}\n.kt-page .kt-feature-list li:before{content:\"\\2713\";color:var(--kt-accent);font-weight:bold;position:absolute;left:0;}\n.kt-page .kt-feature-list b{color:#222;}\n.kt-page .kt-specs-wrap{box-sizing:border-box;}\n.kt-page .kt-specs{display:table !important;width:100% !important;border-collapse:collapse;margin:40px 0;font-size:15px;}\n.kt-page .kt-specs th,.kt-page .kt-specs td{border:2px solid #000;padding:10px 12px;text-align:left;}\n.kt-page .kt-specs th{background:var(--kt-primary) !important;color:#fff !important;font-size:16px;}\n.kt-page .kt-specs tr:nth-child(even){background:#f2f2f2;}\n.kt-page .kt-specs tr:nth-child(odd){background:#ffffff;}\n.kt-page .kt-cta{text-align:center;margin:40px 0;font-size:18px;font-weight:bold;}\n.kt-page .kt-cta-buttons{display:flex;justify-content:center;gap:16px;margin-top:16px;flex-wrap:wrap;}\n.kt-page .kt-cta-buttons a{display:inline-block;padding:12px 26px;border:2px solid var(--kt-primary);border-radius:4px;color:var(--kt-primary);text-decoration:none;font-weight:bold;font-size:15px;transition:all .15s ease;}\n.kt-page .kt-cta-buttons a:hover{background:var(--kt-primary);color:#fff;}\n.kt-page .kt-manuals a{display:block;color:var(--kt-primary);font-weight:bold;font-size:30px;text-align:left;text-decoration:none;margin-bottom:10px;}\n.kt-page .kt-manuals a:hover{color:var(--kt-accent);}\n@media (max-width:768px){\n  .kt-page .kt-hero,.kt-page .kt-features{flex-direction:column;}\n  .kt-page .kt-hero-img img,.kt-page .kt-features-img img{max-width:400px;}\n  .kt-page .kt-hero-copy p,.kt-page .kt-features-copy p{font-size:17px;}\n  .kt-page .kt-cta-buttons{display:grid;grid-template-columns:1fr 1fr;gap:12px;}\n  .kt-page .kt-cta-buttons a:nth-child(3){grid-column:1 \/ span 2;}\n  .kt-page .kt-manuals a{font-size:24px;}\n}\n\u003c\/style\u003e\n\n\u003cdiv class=\"kt-hero\"\u003e\n  \u003cdiv class=\"kt-hero-copy\"\u003e\n    \u003ch2\u003eDial In Comfortable Brightness For Visual Solar Viewing\u003c\/h2\u003e\n        \u003cp\u003eThis polarizing filter unit from Lunt pairs with a Lunt White Light Solar Wedge to give you control over image brightness. The wedge and its ND3 filter already bring sunlight down to a safe level, and the polarizer then lets you trim the remaining glare so the disk sits at a comfortable level for your eyes.\u003c\/p\u003e\n    \u003cp\u003eInstallation is simple. Screw the filter onto the barrel of your eyepiece, drop the eyepiece into the wedge, then rotate the eyepiece or the top filter element to vary transmission. Choose the size that matches your wedge barrel, PF1.25 for the 1.25 inch wedge and PF-2 for the 2 inch wedge.\u003c\/p\u003e\n    \u003cp\u003eThis filter is a brightness control, not a solar filter. It must never be used on its own to look at the Sun. Always observe through properly filtered equipment such as a Herschel wedge on a refractor or a dedicated hydrogen alpha telescope, and add the polarizer only inside that safe optical train.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"kt-hero-img\"\u003e\n    \u003cdiv class=\"kt-sq\"\u003e\n      \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0615\/8273\/7521\/files\/IMG_4077.jpg?v=1749725127\" alt=\"Lunt polarizing filter for white light solar wedges\"\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"kt-features\"\u003e\n  \u003cdiv class=\"kt-features-copy\"\u003e\n    \u003ch3 class=\"kt-section-heading\"\u003eKey Features\u003c\/h3\u003e\n    \u003cul class=\"kt-feature-list\"\u003e\n      \u003cli\u003e\n\u003cb\u003eVariable Brightness\u003c\/b\u003e - rotate the eyepiece or the top element to smoothly change transmission until the solar disk is comfortable.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cb\u003eTwo Sizes\u003c\/b\u003e - PF1.25 threads onto 1.25 inch eyepiece barrels and PF-2 threads onto 2 inch barrels.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cb\u003eWedge Companion\u003c\/b\u003e - designed to work with the Lunt White Light Solar Wedge during visual observing sessions.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cb\u003eSimple Threading\u003c\/b\u003e - screws directly onto the eyepiece barrel with no adapters or tools required.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cb\u003eNot A Solar Filter\u003c\/b\u003e - provides brightness control only and must always sit inside a properly filtered solar setup.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cb\u003eCompact And Portable\u003c\/b\u003e - small enough to live in the wedge case foam alongside your eyepieces.\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"kt-features-img\"\u003e\n    \u003cdiv class=\"kt-sq\"\u003e\n      \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0615\/8273\/7521\/files\/IMG_4085.jpg?v=1749725105\" alt=\"Second view of a Lunt polarizing filter showing the threaded cell\"\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"kt-specs-wrap\"\u003e\n\u003ctable class=\"kt-specs\"\u003e\n  \u003ctr\u003e\u003cth colspan=\"2\"\u003eSpecifications\u003c\/th\u003e\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003ePolarizing brightness control filter\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eModel \/ SKU\u003c\/td\u003e\n\u003ctd\u003ePF1.25 (1.25 inch), PF-2 (2 inch)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e1.25 inch model\u003c\/td\u003e\n\u003ctd\u003ePF1.25, threads onto 1.25 inch eyepiece barrels\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e2 inch model\u003c\/td\u003e\n\u003ctd\u003ePF-2, threads onto 2 inch eyepiece barrels\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eFunction\u003c\/td\u003e\n\u003ctd\u003eVariable image dimming by rotation\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eIntended use\u003c\/td\u003e\n\u003ctd\u003eVisual observing with a Lunt White Light Solar Wedge\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eMounting\u003c\/td\u003e\n\u003ctd\u003eScrews onto the eyepiece barrel\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eTransmission range\u003c\/td\u003e\n\u003ctd\u003eNot published\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eFilter thread size\u003c\/td\u003e\n\u003ctd\u003eNot published\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eSafety note\u003c\/td\u003e\n\u003ctd\u003eBrightness control only, never a substitute for proper solar filtration\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eShipping weight\u003c\/td\u003e\n\u003ctd\u003e1 lb per unit\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eManual\u003c\/td\u003e\n\u003ctd\u003eNot published\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e5 years from date of purchase, original purchaser, manufacturing and workmanship defects\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\n\n\u003cp class=\"kt-cta\"\u003e\n  Talk to a Specialist\n  \u003cspan class=\"kt-cta-buttons\"\u003e\n    \u003ca href=\"\/pages\/contact\" style=\"display:inline-block;padding:12px 26px;border:2px solid var(--kt-primary);border-radius:4px;color:var(--kt-primary);text-decoration:none;font-weight:bold;\"\u003eContact Us\u003c\/a\u003e\n    \u003ca href=\"mailto:sales@telescopedepot.com\" style=\"display:inline-block;padding:12px 26px;border:2px solid var(--kt-primary);border-radius:4px;color:var(--kt-primary);text-decoration:none;font-weight:bold;\"\u003eEmail a Specialist\u003c\/a\u003e\n    \u003ca href=\"\/pages\/shipping\" style=\"display:inline-block;padding:12px 26px;border:2px solid var(--kt-primary);border-radius:4px;color:var(--kt-primary);text-decoration:none;font-weight:bold;\"\u003eShipping Info\u003c\/a\u003e\n  \u003c\/span\u003e\n\u003c\/p\u003e\n\n\u003c\/div\u003e","brand":"Lunt Solar Systems","offers":[{"title":"1.25 inch","offer_id":53917567877231,"sku":"PF1.25","price":26.99,"currency_code":"USD","in_stock":true},{"title":"2 inch","offer_id":53917567909999,"sku":"PF-2","price":32.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0717\/7968\/0367\/files\/IMG_4077.jpg?v=1785527508"},{"product_id":"lunt-60mm-full-aperture-h-alpha-etalon-filter-set","title":"Lunt 60mm Full Aperture H-Alpha Etalon Filter Set","description":"\u003cdiv class=\"kt-page\"\u003e\n\n\u003cstyle\u003e\n.kt-page{--kt-primary:#030B1C;--kt-accent:#2E7FBF;max-width:1100px;margin:0 auto;font-family:inherit;}\n.kt-page.kt-page--wide{max-width:1600px;}\n.kt-page .kt-hero{display:flex;align-items:center;gap:40px;margin-bottom:40px;}\n.kt-page .kt-hero-copy{flex:1 1 55%;}\n.kt-page .kt-hero-img{flex:1 1 40%;text-align:center;}\n.kt-page .kt-sq{width:100%;max-width:420px;aspect-ratio:1\/1;margin:0 auto;background:#ffffff;border-radius:6px;display:flex;align-items:center;justify-content:center;overflow:hidden;}\n.kt-page .kt-sq img{max-width:92%;max-height:92%;width:auto;height:auto;object-fit:contain;}\n.kt-page .kt-hero-copy h2{font-size:26px;margin-bottom:14px;}\n.kt-page .kt-hero-copy p{font-size:16px;line-height:1.6;margin-bottom:14px;}\n.kt-page .kt-features{display:flex;align-items:flex-start;gap:40px;margin:40px 0;}\n.kt-page .kt-features-copy{flex:1 1 55%;}\n.kt-page .kt-features-img{flex:1 1 40%;text-align:center;}\n.kt-page .kt-section-heading{font-size:21px;display:inline-block;padding-bottom:8px;border-bottom:2px solid var(--kt-accent);margin-bottom:18px;}\n.kt-page .kt-feature-list{list-style:none;margin:0;padding:0;}\n.kt-page .kt-feature-list li{font-size:16px;line-height:1.5;margin-bottom:12px;padding-left:26px;position:relative;}\n.kt-page .kt-feature-list li:before{content:\"\\2713\";color:var(--kt-accent);font-weight:bold;position:absolute;left:0;}\n.kt-page .kt-feature-list b{color:#222;}\n.kt-page .kt-specs-wrap{box-sizing:border-box;}\n.kt-page .kt-specs{display:table !important;width:100% !important;border-collapse:collapse;margin:40px 0;font-size:15px;}\n.kt-page .kt-specs th,.kt-page .kt-specs td{border:2px solid #000;padding:10px 12px;text-align:left;}\n.kt-page .kt-specs th{background:var(--kt-primary) !important;color:#fff !important;font-size:16px;}\n.kt-page .kt-specs tr:nth-child(even){background:#f2f2f2;}\n.kt-page .kt-specs tr:nth-child(odd){background:#ffffff;}\n.kt-page .kt-cta{text-align:center;margin:40px 0;font-size:18px;font-weight:bold;}\n.kt-page .kt-cta-buttons{display:flex;justify-content:center;gap:16px;margin-top:16px;flex-wrap:wrap;}\n.kt-page .kt-cta-buttons a{display:inline-block;padding:12px 26px;border:2px solid var(--kt-primary);border-radius:4px;color:var(--kt-primary);text-decoration:none;font-weight:bold;font-size:15px;transition:all .15s ease;}\n.kt-page .kt-cta-buttons a:hover{background:var(--kt-primary);color:#fff;}\n.kt-page .kt-manuals a{display:block;color:var(--kt-primary);font-weight:bold;font-size:30px;text-align:left;text-decoration:none;margin-bottom:10px;}\n.kt-page .kt-manuals a:hover{color:var(--kt-accent);}\n@media (max-width:768px){\n  .kt-page .kt-hero,.kt-page .kt-features{flex-direction:column;}\n  .kt-page .kt-hero-img img,.kt-page .kt-features-img img{max-width:400px;}\n  .kt-page .kt-hero-copy p,.kt-page .kt-features-copy p{font-size:17px;}\n  .kt-page .kt-cta-buttons{display:grid;grid-template-columns:1fr 1fr;gap:12px;}\n  .kt-page .kt-cta-buttons a:nth-child(3){grid-column:1 \/ span 2;}\n  .kt-page .kt-manuals a{font-size:24px;}\n}\n\u003c\/style\u003e\n\n\u003cdiv class=\"kt-hero\"\u003e\n  \u003cdiv class=\"kt-hero-copy\"\u003e\n    \u003ch2\u003eSixty Millimetres Of Unobstructed Hydrogen Alpha\u003c\/h2\u003e\n        \u003cp\u003eThis 60mm full aperture H-alpha etalon package from Lunt places a 60mm tilt tuned etalon in front of your refractor with no central obstruction. Each etalon is individually tested on Lunt metrology equipment and carries a verified 0.4 Angstrom bandpass, so the figure on your unit is measured rather than assumed.\u003c\/p\u003e\n    \u003cp\u003eThe extra aperture over the 50mm set raises resolution and image brightness, which helps when you push magnification on filament structure or want a cleaner full disc frame. Tilt tuning shifts the passband across the hydrogen alpha line at 656.28 nm, and the filter lifts straight off so the refractor returns to night sky duty.\u003c\/p\u003e\n    \u003cp\u003eA Lunt blocking filter must sit in the optical path at all times. Order the set with a B600 for focal lengths to 540 mm, a B1200 to 1080 mm, a B1800 to 1620 mm or a B3400 for the longest focal lengths, and pick the 2 inch or 1.25 inch fitting to match your focuser.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"kt-hero-img\"\u003e\n    \u003cdiv class=\"kt-sq\"\u003e\n      \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0615\/8273\/7521\/files\/Double-Stack-Filter-60F-Lunt-Solar-Telescope.jpg?v=1743112794\" alt=\"Lunt LS60FHa 60mm front mount full aperture hydrogen alpha etalon filter\"\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"kt-features\"\u003e\n  \u003cdiv class=\"kt-features-copy\"\u003e\n    \u003ch3 class=\"kt-section-heading\"\u003eKey Features\u003c\/h3\u003e\n    \u003cul class=\"kt-feature-list\"\u003e\n      \u003cli\u003e\n\u003cb\u003eVerified Bandpass\u003c\/b\u003e - 0.4 Angstrom, individually measured on Lunt metrology equipment for every unit\u003c\/li\u003e\n      \u003cli\u003e\n\u003cb\u003eFull 60mm Aperture\u003c\/b\u003e - no central support foot, so the whole objective area stays clear\u003c\/li\u003e\n      \u003cli\u003e\n\u003cb\u003eTilt Tuned\u003c\/b\u003e - angle the housing to place the passband on the 656.28 nm line\u003c\/li\u003e\n      \u003cli\u003e\n\u003cb\u003eDouble Stack Capable\u003c\/b\u003e - in series with a second etalon the combined bandpass drops below 0.28 Angstrom\u003c\/li\u003e\n      \u003cli\u003e\n\u003cb\u003eBlocking Filter Options\u003c\/b\u003e - B600, B1200, B1800 and B3400 to match focal length and sensor size\u003c\/li\u003e\n      \u003cli\u003e\n\u003cb\u003eHard Case\u003c\/b\u003e - stored in an aluminium case with fitted foam\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"kt-features-img\"\u003e\n    \u003cdiv class=\"kt-sq\"\u003e\n      \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0615\/8273\/7521\/files\/Double-Stack-Filter-60F-Lunt-Solar-Telescope-2.jpg?v=1743112794\" alt=\"Alternate view of the Lunt LS60FHa 60mm front mount etalon filter housing and tilt tuning ring\"\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"kt-specs-wrap\"\u003e\n\u003ctable class=\"kt-specs\"\u003e\n  \u003ctr\u003e\u003cth colspan=\"2\"\u003eSpecifications\u003c\/th\u003e\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eFront mounted full aperture hydrogen alpha etalon filter set\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eEtalon Aperture\u003c\/td\u003e\n\u003ctd\u003e60 mm, no central obstruction\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eWavelength\u003c\/td\u003e\n\u003ctd\u003eHydrogen alpha, 656.28 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eSingle Etalon Bandpass\u003c\/td\u003e\n\u003ctd\u003e0.4 Angstrom, individually verified\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eDouble Stack Bandpass\u003c\/td\u003e\n\u003ctd\u003eLess than 0.28 Angstrom with a second etalon in series\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eTuning\u003c\/td\u003e\n\u003ctd\u003eTilt tuned\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eB600 Blocking Filter\u003c\/td\u003e\n\u003ctd\u003e6 mm clear aperture, up to 540 mm focal length, 1.25 inch or 2 inch diagonal\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eB1200 Blocking Filter\u003c\/td\u003e\n\u003ctd\u003e12 mm clear aperture, up to 1080 mm focal length, 1.25 inch or 2 inch diagonal\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eB1800 Blocking Filter\u003c\/td\u003e\n\u003ctd\u003e18 mm clear aperture, up to 1620 mm focal length, 1.25 inch or 2 inch diagonal\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eB3400 Blocking Filter\u003c\/td\u003e\n\u003ctd\u003e34 mm clear aperture, up to 3060 mm focal length, 2 inch straight through tube\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eFocuser Fitting\u003c\/td\u003e\n\u003ctd\u003eCodes ending in 2 supply a 2 inch blocking filter, codes ending in 1 supply 1.25 inch\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eBlocking Filter Required\u003c\/td\u003e\n\u003ctd\u003eYes, a Lunt blocking filter must remain in the optical path at all times\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eStorage\u003c\/td\u003e\n\u003ctd\u003eAluminium hard case with fitted foam\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eFilter Weight\u003c\/td\u003e\n\u003ctd\u003eLunt lists approximately 3 lb for the etalon assembly\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eStorefront Listing\u003c\/td\u003e\n\u003ctd\u003ePublished as Lunt LS60FHa Front Mount 60 mm Double Stack Filter, etalon only, blocking filter sold separately\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eModel \/ SKU\u003c\/td\u003e\n\u003ctd\u003eLS60FHa2\/B600, LS60FHa1\/B600, LS60FHa2\/B1200, LS60FHa1\/B1200, LS60FHa2\/B1800, LS60FHa1\/B1800, LS60FHa\/B3400\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eShipping Weight\u003c\/td\u003e\n\u003ctd\u003e11 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e5 years from date of purchase, original purchaser, manufacturing and workmanship defects\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\n\n\u003cp class=\"kt-cta\"\u003e\n  Talk to a Specialist\n  \u003cspan class=\"kt-cta-buttons\"\u003e\n    \u003ca href=\"\/pages\/contact\" style=\"display:inline-block;padding:12px 26px;border:2px solid var(--kt-primary);border-radius:4px;color:var(--kt-primary);text-decoration:none;font-weight:bold;\"\u003eContact Us\u003c\/a\u003e\n    \u003ca href=\"mailto:sales@telescopedepot.com\" style=\"display:inline-block;padding:12px 26px;border:2px solid var(--kt-primary);border-radius:4px;color:var(--kt-primary);text-decoration:none;font-weight:bold;\"\u003eEmail a Specialist\u003c\/a\u003e\n    \u003ca href=\"\/pages\/shipping\" style=\"display:inline-block;padding:12px 26px;border:2px solid var(--kt-primary);border-radius:4px;color:var(--kt-primary);text-decoration:none;font-weight:bold;\"\u003eShipping Info\u003c\/a\u003e\n  \u003c\/span\u003e\n\u003c\/p\u003e\n\n\u003c\/div\u003e","brand":"Lunt Solar Systems","offers":[{"title":"B600 \/ 2\" Focuser","offer_id":53917583343727,"sku":"LS60FHa2\/B600","price":2195.99,"currency_code":"USD","in_stock":true},{"title":"B600 \/ 1.25\" Focuser","offer_id":53917583376495,"sku":"LS60FHa1\/B600","price":2195.99,"currency_code":"USD","in_stock":true},{"title":"B1200 \/ 2\" Focuser","offer_id":53917583409263,"sku":"LS60FHa2\/B1200","price":2295.99,"currency_code":"USD","in_stock":true},{"title":"B1200 \/ 1.25\" Focuser","offer_id":53917583442031,"sku":"LS60FHa1\/B1200","price":2295.99,"currency_code":"USD","in_stock":true},{"title":"B1800 \/ 2\" Focuser","offer_id":53917583474799,"sku":"LS60FHa2\/B1800","price":2595.99,"currency_code":"USD","in_stock":true},{"title":"B1800 \/ 1.25\" Focuser","offer_id":53917583507567,"sku":"LS60FHa1\/B1800","price":2595.99,"currency_code":"USD","in_stock":true},{"title":"B3400 \/ 2\" Focuser","offer_id":53917583540335,"sku":"LS60FHa\/B3400","price":4395.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0717\/7968\/0367\/files\/Double-Stack-Filter-60F-Lunt-Solar-Telescope_cf061cf5-9959-40a7-aa24-70f8fa9e6750.jpg?v=1785527516"},{"product_id":"lunt-high-resolution-glass-upgrade","title":"Lunt High Resolution Glass Upgrade","description":"\u003cdiv class=\"kt-page\"\u003e\n\n\u003cstyle\u003e\n.kt-page{--kt-primary:#030B1C;--kt-accent:#2E7FBF;max-width:1100px;margin:0 auto;font-family:inherit;}\n.kt-page.kt-page--wide{max-width:1600px;}\n.kt-page .kt-hero{display:flex;align-items:center;gap:40px;margin-bottom:40px;}\n.kt-page .kt-hero-copy{flex:1 1 55%;}\n.kt-page .kt-hero-img{flex:1 1 40%;text-align:center;}\n.kt-page .kt-sq{width:100%;max-width:420px;aspect-ratio:1\/1;margin:0 auto;background:#ffffff;border-radius:6px;display:flex;align-items:center;justify-content:center;overflow:hidden;}\n.kt-page .kt-sq img{max-width:92%;max-height:92%;width:auto;height:auto;object-fit:contain;}\n.kt-page .kt-hero-copy h2{font-size:26px;margin-bottom:14px;}\n.kt-page .kt-hero-copy p{font-size:16px;line-height:1.6;margin-bottom:14px;}\n.kt-page .kt-features{display:flex;align-items:flex-start;gap:40px;margin:40px 0;}\n.kt-page .kt-features-copy{flex:1 1 55%;}\n.kt-page .kt-features-img{flex:1 1 40%;text-align:center;}\n.kt-page .kt-section-heading{font-size:21px;display:inline-block;padding-bottom:8px;border-bottom:2px solid var(--kt-accent);margin-bottom:18px;}\n.kt-page .kt-feature-list{list-style:none;margin:0;padding:0;}\n.kt-page .kt-feature-list li{font-size:16px;line-height:1.5;margin-bottom:12px;padding-left:26px;position:relative;}\n.kt-page .kt-feature-list li:before{content:\"\\2713\";color:var(--kt-accent);font-weight:bold;position:absolute;left:0;}\n.kt-page .kt-feature-list b{color:#222;}\n.kt-page .kt-specs-wrap{box-sizing:border-box;}\n.kt-page .kt-specs{display:table !important;width:100% !important;border-collapse:collapse;margin:40px 0;font-size:15px;}\n.kt-page .kt-specs th,.kt-page .kt-specs td{border:2px solid #000;padding:10px 12px;text-align:left;}\n.kt-page .kt-specs th{background:var(--kt-primary) !important;color:#fff !important;font-size:16px;}\n.kt-page .kt-specs tr:nth-child(even){background:#f2f2f2;}\n.kt-page .kt-specs tr:nth-child(odd){background:#ffffff;}\n.kt-page .kt-cta{text-align:center;margin:40px 0;font-size:18px;font-weight:bold;}\n.kt-page .kt-cta-buttons{display:flex;justify-content:center;gap:16px;margin-top:16px;flex-wrap:wrap;}\n.kt-page .kt-cta-buttons a{display:inline-block;padding:12px 26px;border:2px solid var(--kt-primary);border-radius:4px;color:var(--kt-primary);text-decoration:none;font-weight:bold;font-size:15px;transition:all .15s ease;}\n.kt-page .kt-cta-buttons a:hover{background:var(--kt-primary);color:#fff;}\n.kt-page .kt-manuals a{display:block;color:var(--kt-primary);font-weight:bold;font-size:30px;text-align:left;text-decoration:none;margin-bottom:10px;}\n.kt-page .kt-manuals a:hover{color:var(--kt-accent);}\n@media (max-width:768px){\n  .kt-page .kt-hero,.kt-page .kt-features{flex-direction:column;}\n  .kt-page .kt-hero-img img,.kt-page .kt-features-img img{max-width:400px;}\n  .kt-page .kt-hero-copy p,.kt-page .kt-features-copy p{font-size:17px;}\n  .kt-page .kt-cta-buttons{display:grid;grid-template-columns:1fr 1fr;gap:12px;}\n  .kt-page .kt-cta-buttons a:nth-child(3){grid-column:1 \/ span 2;}\n  .kt-page .kt-manuals a{font-size:24px;}\n}\n\u003c\/style\u003e\n\n\u003cdiv class=\"kt-hero\"\u003e\n  \u003cdiv class=\"kt-hero-copy\"\u003e\n    \u003ch2\u003eCut Background Glow In Double Stack Systems\u003c\/h2\u003e\n        \u003cp\u003eThe High Resolution Glass upgrade is an optional element for a Lunt internal double stack system. It targets the faint background glow that internal double stack modules produce, and it does that without changing how the double stack tunes or how narrow the passband becomes. You keep the 0.5 Angstrom or better bandwidth and gain a cleaner background.\u003c\/p\u003e\n    \u003cp\u003eThree versions match three double stack systems. The HRG\/80 fits the double stack filter on an 80THa. The HRG\/100 fits the double stack filter on a 100THa. The HRG\/SFPT fits the internal SFPT module used on the 80MT and 100MT universal telescopes. Choose the one that matches the module already on your telescope.\u003c\/p\u003e\n    \u003cp\u003eImagers benefit most. With less scattered light in the field, prominences at the limb separate from the sky background and edge detail holds together at higher stretch. Visual observers see a darker field around the disk as well. Each unit ships at about one pound, so it adds no meaningful load to your mount or your balance.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"kt-hero-img\"\u003e\n    \u003cdiv class=\"kt-sq\"\u003e\n      \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0615\/8273\/7521\/files\/IMG_3031-scaled.jpg?v=1743113074\" alt=\"Lunt high resolution glass upgrade element for internal double stack hydrogen alpha systems\"\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"kt-features\"\u003e\n  \u003cdiv class=\"kt-features-copy\"\u003e\n    \u003ch3 class=\"kt-section-heading\"\u003eKey Features\u003c\/h3\u003e\n    \u003cul class=\"kt-feature-list\"\u003e\n      \u003cli\u003e\n\u003cb\u003eLower Background Glow\u003c\/b\u003e - cuts the faint background glow that is innate to internal double stack systems.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cb\u003eBuilt For Imaging\u003c\/b\u003e - helps prominence and limb detail stand clear of scattered light when you stretch a solar image.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cb\u003eThree Fitments\u003c\/b\u003e - arrives as HRG\/80 for the 80THa double stack, HRG\/100 for the 100THa double stack and HRG\/SFPT for the SFPT module.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cb\u003eBandwidth Unchanged\u003c\/b\u003e - leaves the double stack passband intact, so the system still delivers 0.5 Angstrom or better.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cb\u003eLight Addition\u003c\/b\u003e - weighs about one pound, so balance and mount load stay effectively the same.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cb\u003eOptional Upgrade\u003c\/b\u003e - can be added to a double stack system you already own rather than specified at the time of telescope purchase.\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"kt-features-img\"\u003e\n    \u003cdiv class=\"kt-sq\"\u003e\n      \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0615\/8273\/7521\/files\/IMG_3028.jpg?v=1743113074\" alt=\"Second view of the Lunt high resolution filter that reduces background glow in double stack modules\"\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"kt-specs-wrap\"\u003e\n\u003ctable class=\"kt-specs\"\u003e\n  \u003ctr\u003e\u003cth colspan=\"2\"\u003eSpecifications\u003c\/th\u003e\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eModel \/ SKU\u003c\/td\u003e\n\u003ctd\u003eHRG\/80, HRG\/100, HRG\/SFPT, listed by Lunt as HRG\/80DS, HRG\/100DS and HRG\/SFPT\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003ehigh resolution glass upgrade element for Lunt internal double stack systems\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eHRG\/80\u003c\/td\u003e\n\u003ctd\u003efits the double stack filter on the LS80THa\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eHRG\/100\u003c\/td\u003e\n\u003ctd\u003efits the double stack filter on the LS100THa\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eHRG\/SFPT\u003c\/td\u003e\n\u003ctd\u003efits the SFPT internal double stack module on the LS80MT and LS100MT\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003ePurpose\u003c\/td\u003e\n\u003ctd\u003ereduces the faint background glow inherent to internal double stack systems\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eBandwidth\u003c\/td\u003e\n\u003ctd\u003eunchanged, the host double stack system still delivers 0.5 Angstrom or better\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eTuning\u003c\/td\u003e\n\u003ctd\u003enone, the upgrade carries no tuning control of its own\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eClear Aperture\u003c\/td\u003e\n\u003ctd\u003eNot published\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eBest Suited To\u003c\/td\u003e\n\u003ctd\u003eimaging prominence and limb detail, and visual observers who want a darker background\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eMounting\u003c\/td\u003e\n\u003ctd\u003einstalls into the existing double stack module or filter\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e1 lb shipping weight for each of the three versions\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eWhat's Included\u003c\/td\u003e\n\u003ctd\u003eNot published\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e5 years from date of purchase against manufacturing and workmanship defects\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\n\n\u003cp class=\"kt-cta\"\u003e\n  Talk to a Specialist\n  \u003cspan class=\"kt-cta-buttons\"\u003e\n    \u003ca href=\"\/pages\/contact\" style=\"display:inline-block;padding:12px 26px;border:2px solid var(--kt-primary);border-radius:4px;color:var(--kt-primary);text-decoration:none;font-weight:bold;\"\u003eContact Us\u003c\/a\u003e\n    \u003ca href=\"mailto:sales@telescopedepot.com\" style=\"display:inline-block;padding:12px 26px;border:2px solid var(--kt-primary);border-radius:4px;color:var(--kt-primary);text-decoration:none;font-weight:bold;\"\u003eEmail a Specialist\u003c\/a\u003e\n    \u003ca href=\"\/pages\/shipping\" style=\"display:inline-block;padding:12px 26px;border:2px solid var(--kt-primary);border-radius:4px;color:var(--kt-primary);text-decoration:none;font-weight:bold;\"\u003eShipping Info\u003c\/a\u003e\n  \u003c\/span\u003e\n\u003c\/p\u003e\n\n\u003c\/div\u003e","brand":"Lunt Solar Systems","offers":[{"title":"HRG\/80 for 80THa Double Stack","offer_id":53917584228463,"sku":"HRG\/80","price":269.99,"currency_code":"USD","in_stock":true},{"title":"HRG\/100 for 100THa Double Stack","offer_id":53917584261231,"sku":"HRG\/100","price":249.99,"currency_code":"USD","in_stock":true},{"title":"HRG\/SFPT for SFPT 80MT and 100MT","offer_id":53917584293999,"sku":"HRG\/SFPT","price":249.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0717\/7968\/0367\/files\/IMG_3031-scaled.jpg?v=1785527524"},{"product_id":"lunt-100mm-full-aperture-h-alpha-etalon-filter-set","title":"Lunt 100mm Full Aperture H-Alpha Etalon Filter Set","description":"\u003cdiv class=\"kt-page\"\u003e\n\n\u003cstyle\u003e\n.kt-page{--kt-primary:#030B1C;--kt-accent:#2E7FBF;max-width:1100px;margin:0 auto;font-family:inherit;}\n.kt-page.kt-page--wide{max-width:1600px;}\n.kt-page .kt-hero{display:flex;align-items:center;gap:40px;margin-bottom:40px;}\n.kt-page .kt-hero-copy{flex:1 1 55%;}\n.kt-page .kt-hero-img{flex:1 1 40%;text-align:center;}\n.kt-page .kt-sq{width:100%;max-width:420px;aspect-ratio:1\/1;margin:0 auto;background:#ffffff;border-radius:6px;display:flex;align-items:center;justify-content:center;overflow:hidden;}\n.kt-page .kt-sq img{max-width:92%;max-height:92%;width:auto;height:auto;object-fit:contain;}\n.kt-page .kt-hero-copy h2{font-size:26px;margin-bottom:14px;}\n.kt-page .kt-hero-copy p{font-size:16px;line-height:1.6;margin-bottom:14px;}\n.kt-page .kt-features{display:flex;align-items:flex-start;gap:40px;margin:40px 0;}\n.kt-page .kt-features-copy{flex:1 1 55%;}\n.kt-page .kt-features-img{flex:1 1 40%;text-align:center;}\n.kt-page .kt-section-heading{font-size:21px;display:inline-block;padding-bottom:8px;border-bottom:2px solid var(--kt-accent);margin-bottom:18px;}\n.kt-page .kt-feature-list{list-style:none;margin:0;padding:0;}\n.kt-page .kt-feature-list li{font-size:16px;line-height:1.5;margin-bottom:12px;padding-left:26px;position:relative;}\n.kt-page .kt-feature-list li:before{content:\"\\2713\";color:var(--kt-accent);font-weight:bold;position:absolute;left:0;}\n.kt-page .kt-feature-list b{color:#222;}\n.kt-page .kt-specs-wrap{box-sizing:border-box;}\n.kt-page .kt-specs{display:table !important;width:100% !important;border-collapse:collapse;margin:40px 0;font-size:15px;}\n.kt-page .kt-specs th,.kt-page .kt-specs td{border:2px solid #000;padding:10px 12px;text-align:left;}\n.kt-page .kt-specs th{background:var(--kt-primary) !important;color:#fff !important;font-size:16px;}\n.kt-page .kt-specs tr:nth-child(even){background:#f2f2f2;}\n.kt-page .kt-specs tr:nth-child(odd){background:#ffffff;}\n.kt-page .kt-cta{text-align:center;margin:40px 0;font-size:18px;font-weight:bold;}\n.kt-page .kt-cta-buttons{display:flex;justify-content:center;gap:16px;margin-top:16px;flex-wrap:wrap;}\n.kt-page .kt-cta-buttons a{display:inline-block;padding:12px 26px;border:2px solid var(--kt-primary);border-radius:4px;color:var(--kt-primary);text-decoration:none;font-weight:bold;font-size:15px;transition:all .15s ease;}\n.kt-page .kt-cta-buttons a:hover{background:var(--kt-primary);color:#fff;}\n.kt-page .kt-manuals a{display:block;color:var(--kt-primary);font-weight:bold;font-size:30px;text-align:left;text-decoration:none;margin-bottom:10px;}\n.kt-page .kt-manuals a:hover{color:var(--kt-accent);}\n@media (max-width:768px){\n  .kt-page .kt-hero,.kt-page .kt-features{flex-direction:column;}\n  .kt-page .kt-hero-img img,.kt-page .kt-features-img img{max-width:400px;}\n  .kt-page .kt-hero-copy p,.kt-page .kt-features-copy p{font-size:17px;}\n  .kt-page .kt-cta-buttons{display:grid;grid-template-columns:1fr 1fr;gap:12px;}\n  .kt-page .kt-cta-buttons a:nth-child(3){grid-column:1 \/ span 2;}\n  .kt-page .kt-manuals a{font-size:24px;}\n}\n\u003c\/style\u003e\n\n\u003cdiv class=\"kt-hero\"\u003e\n  \u003cdiv class=\"kt-hero-copy\"\u003e\n    \u003ch2\u003eOne Hundred Millimetre Solar Etalon Filter Set\u003c\/h2\u003e\n        \u003cp\u003eThis 100mm full aperture H-alpha etalon package from Lunt is the largest front mounted etalon in the Lunt filter range. The etalon threads onto the front of a customer supplied refractor through a Lunt adapter plate, and the supplied adapters cover refractors up to 102 mm; anything larger needs a custom plate.\u003c\/p\u003e\n    \u003cp\u003eLike the smaller full aperture sets, the etalon covers the whole objective with no central support foot, and each set is ordered with a blocking filter chosen for your focal length and focuser size. The trailing 2 or 1 in each code tells you whether the blocking filter arrives in a 2 inch or a 1.25 inch fitting.\u003c\/p\u003e\n    \u003cp\u003eLunt's own manual quotes under 0.75 Angstrom single stack and about 0.55 Angstrom when a second etalon is added, while dealer spec sheets quote under 0.7 and under 0.5. Both figures are shown below so you can see the spread. Note that the etalon on its own, without a blocking filter, is sold separately on our double stack etalon page.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"kt-hero-img\"\u003e\n    \u003cdiv class=\"kt-sq\"\u003e\n      \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0615\/8273\/7521\/files\/DS2-80-Double-Stack-Filter-Lunt-Solar-Telescope.jpg?v=1743113214\" alt=\"Lunt double stack etalon filter module for the 80 mm and 100 mm universal telescopes\"\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"kt-features\"\u003e\n  \u003cdiv class=\"kt-features-copy\"\u003e\n    \u003ch3 class=\"kt-section-heading\"\u003eKey Features\u003c\/h3\u003e\n    \u003cul class=\"kt-feature-list\"\u003e\n      \u003cli\u003e\n\u003cb\u003eFull Aperture\u003c\/b\u003e - the etalon covers the whole objective with no central obstruction, as on the 50mm and 60mm sets\u003c\/li\u003e\n      \u003cli\u003e\n\u003cb\u003eBlocking Filter Choice\u003c\/b\u003e - ordered with a B600, B1200, B1800 or B3400 blocking filter\u003c\/li\u003e\n      \u003cli\u003e\n\u003cb\u003eFocuser Fit\u003c\/b\u003e - codes ending in 2 supply a 2 inch blocking filter, codes ending in 1 supply 1.25 inch\u003c\/li\u003e\n      \u003cli\u003e\n\u003cb\u003eBandpass\u003c\/b\u003e - under 0.75 Angstrom single stack per Lunt's manual, about 0.55 Angstrom double stacked\u003c\/li\u003e\n      \u003cli\u003e\n\u003cb\u003eBlocking Filter Required\u003c\/b\u003e - a Lunt blocking filter must stay in the optical path at all times for safe viewing\u003c\/li\u003e\n      \u003cli\u003e\n\u003cb\u003eAdapter Plate Required\u003c\/b\u003e - mounts to a customer supplied refractor through a Lunt adapter plate, sold separately\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"kt-features-img\"\u003e\n    \u003cdiv class=\"kt-sq\"\u003e\n      \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0615\/8273\/7521\/files\/DS2-80-Double-Stack-Filter-Lunt-Solar-Telescope-1.jpg?v=1743113214\" alt=\"Alternate view of the Lunt 80 mm and 100 mm class double stack etalon module\"\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"kt-specs-wrap\"\u003e\n\u003ctable class=\"kt-specs\"\u003e\n  \u003ctr\u003e\u003cth colspan=\"2\"\u003eSpecifications\u003c\/th\u003e\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eFront mounted full aperture hydrogen alpha etalon filter set\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eEtalon Aperture\u003c\/td\u003e\n\u003ctd\u003e100 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eTelescope Fit\u003c\/td\u003e\n\u003ctd\u003eAny customer supplied refractor via a Lunt adapter plate; adapters cover refractors up to 102 mm, larger apertures need a custom plate\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eFront Thread\u003c\/td\u003e\n\u003ctd\u003eM120 x 1.5 female on the filter body, per Teleskop Express and Bresser\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eCentral Obstruction\u003c\/td\u003e\n\u003ctd\u003eNone, in line with the other full aperture sets\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eWavelength\u003c\/td\u003e\n\u003ctd\u003eHydrogen alpha, 656.28 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eBandpass\u003c\/td\u003e\n\u003ctd\u003eUnder 0.75 Angstrom single stack per Lunt's own LS100FHa manual; dealer spec sheets publish under 0.7 Angstrom. About 0.55 Angstrom when a second etalon is added\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eTuning\u003c\/td\u003e\n\u003ctd\u003eTilt tuned, front mounted integrally tuned etalon\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eB600 Blocking Filter\u003c\/td\u003e\n\u003ctd\u003e6 mm clear aperture, visual to 600 mm and imaging to 400 mm focal length\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eB1200 Blocking Filter\u003c\/td\u003e\n\u003ctd\u003e12 mm clear aperture, visual to 1200 mm and imaging to 600 mm focal length\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eB1800 Blocking Filter\u003c\/td\u003e\n\u003ctd\u003e18 mm clear aperture, visual to 1800 mm and imaging to 1200 mm focal length\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eB3400 Blocking Filter\u003c\/td\u003e\n\u003ctd\u003e34 mm clear aperture, visual to 3400 mm and imaging to 1800 mm focal length\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eFocuser Fitting\u003c\/td\u003e\n\u003ctd\u003eCodes ending in 2 supply a 2 inch blocking filter, codes ending in 1 supply 1.25 inch\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eBlocking Filter Required\u003c\/td\u003e\n\u003ctd\u003eYes, a Lunt blocking filter must remain in the optical path at all times\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eStorage\u003c\/td\u003e\n\u003ctd\u003eAluminum finished hard case with fitted foam\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eStorefront Listing\u003c\/td\u003e\n\u003ctd\u003eListed on Lunt's DoubleStack H-Alpha Filters collection at 4,495 USD for the etalon alone, but the tile links to a product page that currently returns a 404 on Lunt's own site\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eModel \/ SKU\u003c\/td\u003e\n\u003ctd\u003eLS100FHa2\/B600, LS100FHa1\/B600, LS100FHa2\/B1200, LS100FHa1\/B1200, LS100FHa2\/B1800, LS100FHa1\/B1800, LS100FHa2\/B3400\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eShipping Weight\u003c\/td\u003e\n\u003ctd\u003e8 lb per the telescopes.net and Astronomy Plus spec tables\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e5 years from date of purchase, original purchaser, manufacturing and workmanship defects\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"kt-manuals\"\u003e\n\u003ch6\u003eManuals\u003c\/h6\u003e\n\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0615\/8273\/7521\/files\/LS100FHa_Manual.pdf?v=1748274315\" style=\"display:block;color:var(--kt-primary);font-weight:bold;font-size:30px;text-align:left;text-decoration:none;margin-bottom:10px;\" target=\"_blank\" rel=\"noopener\"\u003eProduct Manual (PDF)\u003c\/a\u003e\n\u003c\/div\u003e\n\n\u003cp class=\"kt-cta\"\u003e\n  Talk to a Specialist\n  \u003cspan class=\"kt-cta-buttons\"\u003e\n    \u003ca href=\"\/pages\/contact\" style=\"display:inline-block;padding:12px 26px;border:2px solid var(--kt-primary);border-radius:4px;color:var(--kt-primary);text-decoration:none;font-weight:bold;\"\u003eContact Us\u003c\/a\u003e\n    \u003ca href=\"mailto:sales@telescopedepot.com\" style=\"display:inline-block;padding:12px 26px;border:2px solid var(--kt-primary);border-radius:4px;color:var(--kt-primary);text-decoration:none;font-weight:bold;\"\u003eEmail a Specialist\u003c\/a\u003e\n    \u003ca href=\"\/pages\/shipping\" style=\"display:inline-block;padding:12px 26px;border:2px solid var(--kt-primary);border-radius:4px;color:var(--kt-primary);text-decoration:none;font-weight:bold;\"\u003eShipping Info\u003c\/a\u003e\n  \u003c\/span\u003e\n\u003c\/p\u003e\n\n\u003c\/div\u003e","brand":"Lunt Solar Systems","offers":[{"title":"B600 \/ 2\" Focuser","offer_id":53917599793263,"sku":"LS100FHa2\/B600","price":4895.99,"currency_code":"USD","in_stock":true},{"title":"B600 \/ 1.25\" Focuser","offer_id":53917599826031,"sku":"LS100FHa1\/B600","price":4895.99,"currency_code":"USD","in_stock":true},{"title":"B1200 \/ 2\" Focuser","offer_id":53917599858799,"sku":"LS100FHa2\/B1200","price":4995.99,"currency_code":"USD","in_stock":true},{"title":"B1200 \/ 1.25\" Focuser","offer_id":53917599891567,"sku":"LS100FHa1\/B1200","price":4995.99,"currency_code":"USD","in_stock":true},{"title":"B1800 \/ 2\" Focuser","offer_id":53917599924335,"sku":"LS100FHa2\/B1800","price":5295.99,"currency_code":"USD","in_stock":true},{"title":"B1800 \/ 1.25\" Focuser","offer_id":53917599957103,"sku":"LS100FHa1\/B1800","price":5295.99,"currency_code":"USD","in_stock":true},{"title":"B3400 \/ 2\" Focuser","offer_id":53917599989871,"sku":"LS100FHa2\/B3400","price":6995.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0717\/7968\/0367\/files\/DS2-80-Double-Stack-Filter-Lunt-Solar-Telescope_ecbf3db1-7aeb-4373-8927-fc3e746289e4.jpg?v=1785527527"},{"product_id":"lunt-h-alpha-blocking-filter","title":"Lunt H-Alpha Blocking Filter","description":"\u003cdiv class=\"kt-page\"\u003e\n\n\u003cstyle\u003e\n.kt-page{--kt-primary:#030B1C;--kt-accent:#2E7FBF;max-width:1100px;margin:0 auto;font-family:inherit;}\n.kt-page.kt-page--wide{max-width:1600px;}\n.kt-page .kt-hero{display:flex;align-items:center;gap:40px;margin-bottom:40px;}\n.kt-page .kt-hero-copy{flex:1 1 55%;}\n.kt-page .kt-hero-img{flex:1 1 40%;text-align:center;}\n.kt-page .kt-sq{width:100%;max-width:420px;aspect-ratio:1\/1;margin:0 auto;background:#ffffff;border-radius:6px;display:flex;align-items:center;justify-content:center;overflow:hidden;}\n.kt-page .kt-sq img{max-width:92%;max-height:92%;width:auto;height:auto;object-fit:contain;}\n.kt-page .kt-hero-copy h2{font-size:26px;margin-bottom:14px;}\n.kt-page .kt-hero-copy p{font-size:16px;line-height:1.6;margin-bottom:14px;}\n.kt-page .kt-features{display:flex;align-items:flex-start;gap:40px;margin:40px 0;}\n.kt-page .kt-features-copy{flex:1 1 55%;}\n.kt-page .kt-features-img{flex:1 1 40%;text-align:center;}\n.kt-page .kt-section-heading{font-size:21px;display:inline-block;padding-bottom:8px;border-bottom:2px solid var(--kt-accent);margin-bottom:18px;}\n.kt-page .kt-feature-list{list-style:none;margin:0;padding:0;}\n.kt-page .kt-feature-list li{font-size:16px;line-height:1.5;margin-bottom:12px;padding-left:26px;position:relative;}\n.kt-page .kt-feature-list li:before{content:\"\\2713\";color:var(--kt-accent);font-weight:bold;position:absolute;left:0;}\n.kt-page .kt-feature-list b{color:#222;}\n.kt-page .kt-specs-wrap{box-sizing:border-box;}\n.kt-page .kt-specs{display:table !important;width:100% !important;border-collapse:collapse;margin:40px 0;font-size:15px;}\n.kt-page .kt-specs th,.kt-page .kt-specs td{border:2px solid #000;padding:10px 12px;text-align:left;}\n.kt-page .kt-specs th{background:var(--kt-primary) !important;color:#fff !important;font-size:16px;}\n.kt-page .kt-specs tr:nth-child(even){background:#f2f2f2;}\n.kt-page .kt-specs tr:nth-child(odd){background:#ffffff;}\n.kt-page .kt-cta{text-align:center;margin:40px 0;font-size:18px;font-weight:bold;}\n.kt-page .kt-cta-buttons{display:flex;justify-content:center;gap:16px;margin-top:16px;flex-wrap:wrap;}\n.kt-page .kt-cta-buttons a{display:inline-block;padding:12px 26px;border:2px solid var(--kt-primary);border-radius:4px;color:var(--kt-primary);text-decoration:none;font-weight:bold;font-size:15px;transition:all .15s ease;}\n.kt-page .kt-cta-buttons a:hover{background:var(--kt-primary);color:#fff;}\n.kt-page .kt-manuals a{display:block;color:var(--kt-primary);font-weight:bold;font-size:30px;text-align:left;text-decoration:none;margin-bottom:10px;}\n.kt-page .kt-manuals a:hover{color:var(--kt-accent);}\n@media (max-width:768px){\n  .kt-page .kt-hero,.kt-page .kt-features{flex-direction:column;}\n  .kt-page .kt-hero-img img,.kt-page .kt-features-img img{max-width:400px;}\n  .kt-page .kt-hero-copy p,.kt-page .kt-features-copy p{font-size:17px;}\n  .kt-page .kt-cta-buttons{display:grid;grid-template-columns:1fr 1fr;gap:12px;}\n  .kt-page .kt-cta-buttons a:nth-child(3){grid-column:1 \/ span 2;}\n  .kt-page .kt-manuals a{font-size:24px;}\n}\n\u003c\/style\u003e\n\n\u003cdiv class=\"kt-hero\"\u003e\n  \u003cdiv class=\"kt-hero-copy\"\u003e\n    \u003ch2\u003eChoose The Right Blocking Filter Aperture\u003c\/h2\u003e\n        \u003cp\u003eA Lunt blocking filter is required with every Lunt hydrogen alpha etalon or telescope. It is not just a stop; the housing carries an additional filter stack that makes the package safe and gives the final image its contrast. Lunt only warrants safety and performance when one of its own blocking filters sits in the optical path.\u003c\/p\u003e\n    \u003cp\u003eClear aperture sets how much of the light cone gets through. B600 gives 6 mm, B1200 gives 12 mm, B1800 gives 18 mm and B3400 gives 34 mm. Larger apertures hold a fully illuminated field at longer focal lengths, which is what full disc imaging with a bigger sensor needs. Match the size to your telescope focal length.\u003c\/p\u003e\n    \u003cp\u003eHousings come in three styles. The s versions are 2 inch straight through tubes with T2 and 2 inch connections. The d1 versions are star diagonals with a 1.25 inch eyepiece holder and a T2 connection, and the d2 versions are star diagonals with a 2 inch eyepiece holder and T2. For imaging, step up one size from the visual recommendation.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"kt-hero-img\"\u003e\n    \u003cdiv class=\"kt-sq\"\u003e\n      \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0615\/8273\/7521\/files\/B600-Blocking-Filter-Profile.jpg?v=1743112814\" alt=\"Profile view of a Lunt B600 hydrogen alpha blocking filter housing\"\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"kt-features\"\u003e\n  \u003cdiv class=\"kt-features-copy\"\u003e\n    \u003ch3 class=\"kt-section-heading\"\u003eKey Features\u003c\/h3\u003e\n    \u003cul class=\"kt-feature-list\"\u003e\n      \u003cli\u003e\n\u003cb\u003eSafety Critical\u003c\/b\u003e - required in the optical path of every Lunt hydrogen alpha etalon or telescope\u003c\/li\u003e\n      \u003cli\u003e\n\u003cb\u003eFour Clear Apertures\u003c\/b\u003e - 6 mm, 12 mm, 18 mm and 34 mm to suit different focal lengths\u003c\/li\u003e\n      \u003cli\u003e\n\u003cb\u003eStraight Through\u003c\/b\u003e - the s housings are 2 inch extension tubes with T2 and 2 inch connections\u003c\/li\u003e\n      \u003cli\u003e\n\u003cb\u003eStar Diagonal\u003c\/b\u003e - d1 and d2 housings add a star diagonal with a 1.25 inch or 2 inch eyepiece holder\u003c\/li\u003e\n      \u003cli\u003e\n\u003cb\u003eImaging Headroom\u003c\/b\u003e - step one size up from the visual recommendation to allow for extra back focus\u003c\/li\u003e\n      \u003cli\u003e\n\u003cb\u003eFull Disc Imaging\u003c\/b\u003e - the larger apertures keep the field fully illuminated for big sensor full disc work\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"kt-features-img\"\u003e\n    \u003cdiv class=\"kt-sq\"\u003e\n      \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0615\/8273\/7521\/files\/B1800-Blocking-Filter-3qt-Front.jpg?v=1743112814\" alt=\"Three quarter front view of a Lunt B1800 hydrogen alpha blocking filter in a star diagonal housing\"\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"kt-specs-wrap\"\u003e\n\u003ctable class=\"kt-specs\"\u003e\n  \u003ctr\u003e\u003cth colspan=\"2\"\u003eSpecifications\u003c\/th\u003e\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eHydrogen alpha blocking filter module\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eWavelength\u003c\/td\u003e\n\u003ctd\u003eHydrogen alpha, 656.28 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eB600\u003c\/td\u003e\n\u003ctd\u003e6 mm clear aperture, visual to 600 mm focal length, imaging to 400 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eB1200\u003c\/td\u003e\n\u003ctd\u003e12 mm clear aperture, visual to 1200 mm focal length, imaging to 600 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eB1800\u003c\/td\u003e\n\u003ctd\u003e18 mm clear aperture, visual to 1800 mm focal length, imaging to 1200 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eB3400\u003c\/td\u003e\n\u003ctd\u003e34 mm clear aperture, visual to 3400 mm focal length, imaging to 1800 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eStraight Through Housing\u003c\/td\u003e\n\u003ctd\u003e2 inch extension tube with T2 and 2 inch connections, suffix s\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e1.25 Inch Diagonal Housing\u003c\/td\u003e\n\u003ctd\u003eStar diagonal with 1.25 inch eyepiece holder and T2 connection, suffix d1\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e2 Inch Diagonal Housing\u003c\/td\u003e\n\u003ctd\u003eStar diagonal with 2 inch eyepiece holder and T2 connection, suffix d2\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eB3400 Housing\u003c\/td\u003e\n\u003ctd\u003e2 inch straight through extension tube only, no diagonal option published\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eLunt hydrogen alpha etalon filters and Lunt solar telescopes\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eAdditional Sizes Published\u003c\/td\u003e\n\u003ctd\u003eA B400 4 mm and a B500 5 mm filter, both in 1.25 inch diagonals, also appear on the Lunt storefront\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eStorefront SKU Format\u003c\/td\u003e\n\u003ctd\u003eStraight through options are listed as B600s2, B1200s2 and B1800s2, and the 34 mm filter as B3400\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eModel \/ SKU\u003c\/td\u003e\n\u003ctd\u003eB600s, B600d1, B600d2, B1200s, B1200d1, B1200d2, B1800s, B1800d1, B1800d2, B3400s2\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eShipping Weight\u003c\/td\u003e\n\u003ctd\u003e2 lb, published as 907 grams for every variant\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e5 years from date of purchase, original purchaser, manufacturing and workmanship defects\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\n\n\u003cp class=\"kt-cta\"\u003e\n  Talk to a Specialist\n  \u003cspan class=\"kt-cta-buttons\"\u003e\n    \u003ca href=\"\/pages\/contact\" style=\"display:inline-block;padding:12px 26px;border:2px solid var(--kt-primary);border-radius:4px;color:var(--kt-primary);text-decoration:none;font-weight:bold;\"\u003eContact Us\u003c\/a\u003e\n    \u003ca href=\"mailto:sales@telescopedepot.com\" style=\"display:inline-block;padding:12px 26px;border:2px solid var(--kt-primary);border-radius:4px;color:var(--kt-primary);text-decoration:none;font-weight:bold;\"\u003eEmail a Specialist\u003c\/a\u003e\n    \u003ca href=\"\/pages\/shipping\" style=\"display:inline-block;padding:12px 26px;border:2px solid var(--kt-primary);border-radius:4px;color:var(--kt-primary);text-decoration:none;font-weight:bold;\"\u003eShipping Info\u003c\/a\u003e\n  \u003c\/span\u003e\n\u003c\/p\u003e\n\n\u003c\/div\u003e","brand":"Lunt Solar Systems","offers":[{"title":"B600s 6mm, 2\" Straight Through","offer_id":53917630201967,"sku":"B600s","price":395.99,"currency_code":"USD","in_stock":true},{"title":"B600d1 6mm, 1.25\" Star Diagonal","offer_id":53917630234735,"sku":"B600d1","price":395.99,"currency_code":"USD","in_stock":true},{"title":"B600d2 6mm, 2\" Star Diagonal","offer_id":53917630267503,"sku":"B600d2","price":395.99,"currency_code":"USD","in_stock":true},{"title":"B1200s 12mm, 2\" Straight Through","offer_id":53917630300271,"sku":"B1200s","price":495.99,"currency_code":"USD","in_stock":true},{"title":"B1200d1 12mm, 1.25\" Star Diagonal","offer_id":53917630333039,"sku":"B1200d1","price":495.99,"currency_code":"USD","in_stock":true},{"title":"B1200d2 12mm, 2\" Star Diagonal","offer_id":53917630365807,"sku":"B1200d2","price":495.99,"currency_code":"USD","in_stock":true},{"title":"B1800s 18mm, 2\" Straight Through","offer_id":53917630398575,"sku":"B1800s","price":795.99,"currency_code":"USD","in_stock":true},{"title":"B1800d1 18mm, 1.25\" Star Diagonal","offer_id":53917630431343,"sku":"B1800d1","price":795.99,"currency_code":"USD","in_stock":true},{"title":"B1800d2 18mm, 2\" Star Diagonal","offer_id":53917630464111,"sku":"B1800d2","price":795.99,"currency_code":"USD","in_stock":true},{"title":"B3400s2 34mm, 2\" Straight Through","offer_id":53917630496879,"sku":"B3400s2","price":2495.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0717\/7968\/0367\/files\/B600-Blocking-Filter-Profile.jpg?v=1785527527"}],"url":"https:\/\/telescopedepot.com\/collections\/solar-filters.oembed","provider":"Telescope Depot","version":"1.0","type":"link"}