{"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","url":"https:\/\/telescopedepot.com\/products\/lunt-50mm-full-aperture-h-alpha-etalon-filter-set","provider":"Telescope Depot","version":"1.0","type":"link"}