{"product_id":"lunt-double-stack-filter-for-dedicated-telescopes","title":"Lunt Double Stack Filter for Dedicated 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\u003eHigher Contrast For Dedicated Lunt Solar Telescopes\u003c\/h2\u003e\n        \u003cp\u003eA dedicated Lunt hydrogen alpha telescope already reaches 0.7 Angstrom or better in single stack. Adding a double stack filter places a second etalon in series and pulls the combined bandwidth to 0.5 Angstrom or better. Lunt publishes tighter figures still on the current 40mm and 152mm systems. The Sun's surface gains contrast immediately.\u003c\/p\u003e\n    \u003cp\u003eThree versions cover the dedicated range. The LS40FHaP is a 40mm front mounted tilt tuned etalon for the LS40THa, and Lunt lists the pair at under 0.29 Angstrom combined. The LS50CP is a compact 50mm filter that threads onto the front of an LS50THa in seconds. The DSII\/LS152T is an internal module for the LS152THa.\u003c\/p\u003e\n    \u003cp\u003eExpect filaments to break into dark cores and multiple strands, prominences to show internal threading from base to tip, and plage to separate cleanly from the background chromosphere. A Lunt blocking filter is required at all times, since the double stack filter is not a standalone safety device. Installation needs no tools and no 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\/40ds-tres.png?v=1743113389\" alt=\"Lunt LS40FHa 40mm front mount double stack solar filter shown on a dedicated Lunt 40mm hydrogen alpha telescope\"\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\u003eTighter Bandwidth\u003c\/b\u003e - drops the combined system to 0.5 Angstrom or better, with Lunt publishing under 0.29 Angstrom on the 40mm pairing.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cb\u003eModel Matched Fit\u003c\/b\u003e - comes in a version for each dedicated telescope, so the filter mates directly to the LS40THa, LS50THa or LS152THa.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cb\u003eTilt Tuned Etalons\u003c\/b\u003e - uses tilt tuned front mounted etalons on the 40mm and 50mm versions and a pressure tuned internal module on the 152mm.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cb\u003eGrab And Go Friendly\u003c\/b\u003e - keeps the compact 50mm system light enough to stay on a photo tripod or a small Vixen compatible mount.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cb\u003eTool Free Installation\u003c\/b\u003e - threads or clamps into place without a factory visit, so the upgrade can wait until you want it.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cb\u003eCase Included\u003c\/b\u003e - stores in an aluminium hard case with fitted foam on the front mounted versions.\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-50C-Lunt-solar-telescope.jpg?v=1743112833\" alt=\"Lunt LS50C compact double stack filter threaded onto the front of an LS50THa 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\u003eLS40FHaP, LS50CP, DSII\/LS152T\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 dedicated Lunt solar telescopes\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eLS40FHaP 40mm\u003c\/td\u003e\n\u003ctd\u003efront mounted 40mm tilt tuned etalon, fits the LS40THa series\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eLS50CP 50mm Compact\u003c\/td\u003e\n\u003ctd\u003ecompact front mounted 50mm tilt tuned etalon, threads onto the LS50THa front cell\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eDSII\/LS152T Internal\u003c\/td\u003e\n\u003ctd\u003einternal double stack module, fits the LS152THa\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eClear Aperture\u003c\/td\u003e\n\u003ctd\u003e40mm or 50mm on the front mounted versions, no central obstruction\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 0.29 Angstrom on the LS40THa pairing, about 0.35 Angstrom on current LS50THa telescopes and under 0.28 Angstrom on the LS152 module, and Lunt's own listing for the DSII\/LS152T module quoting below 0.5 Angstrom pressure tuned\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eSingle Etalon Bandpass\u003c\/td\u003e\n\u003ctd\u003e0.45 Angstrom on the LS40FHa, 0.4 Angstrom on the LS50C and on the LS152 internal module\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eTuning\u003c\/td\u003e\n\u003ctd\u003etilt tuned on the 40mm and 50mm versions, Doppler True pressure tuning on the internal 152mm module\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eBlocking Filter\u003c\/td\u003e\n\u003ctd\u003erequired at all times and sold separately, with B500 or B600 suggested for the 40mm and B600 for the 50mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eMounting\u003c\/td\u003e\n\u003ctd\u003ethreads or clamps onto the telescope front cell, or installs inside the optical path on the 152mm module\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eInstallation\u003c\/td\u003e\n\u003ctd\u003ecustomer installed, no tools and no factory return required\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003eLS40FHa 2 lb shipping, LS50C 3 lb shipping, LS152 internal module 7 lb shipping\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003eDSII\/LS152T internal module 16 x 16 x 12 in shipping, not published for the front mounted versions\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":"LS40FHaP 40mm (LS40THa)","offer_id":53917568434287,"sku":"LS40FHaP","price":695.99,"currency_code":"USD","in_stock":true},{"title":"LS50CP 50mm Compact (LS50THa)","offer_id":53917568467055,"sku":"LS50CP","price":995.99,"currency_code":"USD","in_stock":true},{"title":"DSII\/LS152T Internal Module (LS152THa)","offer_id":53917568499823,"sku":"DSII\/LS152TP","price":2995.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0717\/7968\/0367\/files\/40ds-tres.png?v=1785527508","url":"https:\/\/telescopedepot.com\/products\/lunt-double-stack-filter-for-dedicated-telescopes","provider":"Telescope Depot","version":"1.0","type":"link"}