{"product_id":"lunt-50mm-center-obstructed-h-alpha-filter-set","title":"Lunt 50mm Center Obstructed H-Alpha 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\u003eMore Aperture For Your Existing Refractor\u003c\/h2\u003e\n        \u003cp\u003eThis 50mm center obstructed H-alpha set from Lunt clamps over the centre of your refractor objective and turns it into a solar instrument. The 50mm etalon gathers more light than the 40mm version, so the disc looks brighter and fine detail in filaments and active regions holds up better at higher magnification.\u003c\/p\u003e\n    \u003cp\u003eBandpass is rated below 0.65 Angstrom at 656.28 nm and tuning is by tilt, so you simply angle the housing until the passband sits on the line. There are no pumps or pressure controls. A centre mounted foot carries the etalon, which places a central obstruction in the clear aperture.\u003c\/p\u003e\n    \u003cp\u003eYou choose a B600 or a B1200 blocking filter, and one adapter plate is included in the set. Nine plate sizes run from 55 to 60 mm up to 95 to 100 mm in 5 mm steps, covering objective housings up to 4 inches. The size you need is set by the outside diameter of your dew shield, so to measure for your adapter plate take a measurement of the outside diameter of the dew shield on your refractor telescope. Give that figure at checkout and the matching plate ships with the filter.\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_6136-min.jpg?v=1764862772\" alt=\"Lunt LS50C front mounted center obstructed 50mm hydrogen alpha etalon filter set\"\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\u003eFront Mounted\u003c\/b\u003e - fits over the centre of an existing refractor objective and comes off again in seconds\u003c\/li\u003e\n      \u003cli\u003e\n\u003cb\u003eFifty Millimetre Etalon\u003c\/b\u003e - more light grasp than the 40mm set for brighter views and finer detail\u003c\/li\u003e\n      \u003cli\u003e\n\u003cb\u003eBandpass\u003c\/b\u003e - rated below 0.65 Angstrom at the 656.28 nm hydrogen alpha line\u003c\/li\u003e\n      \u003cli\u003e\n\u003cb\u003eTilt Tuned\u003c\/b\u003e - angle the housing to centre the passband, with no pressure system to manage\u003c\/li\u003e\n      \u003cli\u003e\n\u003cb\u003eNine Adapter Plates\u003c\/b\u003e - one plate for dew shield outer diameters from 55 mm to 100 mm is included in the set\u003c\/li\u003e\n      \u003cli\u003e\n\u003cb\u003eCentre Obstruction\u003c\/b\u003e - the etalon is held by a central foot, so the aperture is obstructed at the middle\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_6132-min.jpg?v=1764862772\" alt=\"Second view of the Lunt 50mm center obstructed etalon housing and its adapter plate\"\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 center obstructed 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, center obstructed by the support foot\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\u003eLess than 0.65 Angstrom\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\u003eBlocking Filter Options\u003c\/td\u003e\n\u003ctd\u003eB600 with 6 mm clear aperture, or B1200 with 12 mm clear aperture\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eB600 Suitability\u003c\/td\u003e\n\u003ctd\u003eLunt lists the included B600 for focal lengths up to 540 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eB1200 Suitability\u003c\/td\u003e\n\u003ctd\u003eLunt lists the B1200 for visual use to 1080 mm and imaging to 540 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eAdapter Plate\u003c\/td\u003e\n\u003ctd\u003eOne plate included with the set, chosen at checkout\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eAdapter Plate Sizing\u003c\/td\u003e\n\u003ctd\u003eMeasured on the outside diameter of the dew shield on your refractor, ranges 55-100 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eAdapter Plate Sizes Published\u003c\/td\u003e\n\u003ctd\u003e55-60, 60-65, 65-70, 70-75, 75-80, 80-85, 85-90, 90-95 and 95-100 mm, taken on the dew shield outer diameter\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eAdapter Plate Codes\u003c\/td\u003e\n\u003ctd\u003eLS50-CO-AP5560 through LS50-CO-AP95100\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eObjective Cell Limit\u003c\/td\u003e\n\u003ctd\u003eObjective housings up to 4 inches\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eUse\u003c\/td\u003e\n\u003ctd\u003eVisual and imaging\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eModel \/ SKU\u003c\/td\u003e\n\u003ctd\u003eLS50F-CO-B600 and LS50F-CO-B1200, plus adapter plate codes LS50-CO-AP5560 through LS50-CO-AP95100\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eStorefront Listing\u003c\/td\u003e\n\u003ctd\u003ePublished as Lunt LS50C Hydrogen-Alpha Front-Mounted Etalon System B600 and B1200\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eShipping Weight\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":"B600 Blocking Filter \/ 55-60mm","offer_id":53917545758831,"sku":"LS50F-CO-B600+LS50-CO-AP5560","price":945.99,"currency_code":"USD","in_stock":true},{"title":"B600 Blocking Filter \/ 60-65mm","offer_id":53917545791599,"sku":"LS50F-CO-B600+LS50-CO-AP6065","price":945.99,"currency_code":"USD","in_stock":true},{"title":"B600 Blocking Filter \/ 65-70mm","offer_id":53917545824367,"sku":"LS50F-CO-B600+LS50-CO-AP6570","price":945.99,"currency_code":"USD","in_stock":true},{"title":"B600 Blocking Filter \/ 70-75mm","offer_id":53917545857135,"sku":"LS50F-CO-B600+LS50-CO-AP7075","price":945.99,"currency_code":"USD","in_stock":true},{"title":"B600 Blocking Filter \/ 75-80mm","offer_id":53917545889903,"sku":"LS50F-CO-B600+LS50-CO-AP7580","price":945.99,"currency_code":"USD","in_stock":true},{"title":"B600 Blocking Filter \/ 80-85mm","offer_id":53917545922671,"sku":"LS50F-CO-B600+LS50-CO-AP8085","price":945.99,"currency_code":"USD","in_stock":true},{"title":"B600 Blocking Filter \/ 85-90mm","offer_id":53917545955439,"sku":"LS50F-CO-B600+LS50-CO-AP8590","price":945.99,"currency_code":"USD","in_stock":true},{"title":"B600 Blocking Filter \/ 90-95mm","offer_id":53917545988207,"sku":"LS50F-CO-B600+LS50-CO-AP9095","price":945.99,"currency_code":"USD","in_stock":true},{"title":"B600 Blocking Filter \/ 95-100mm","offer_id":53917546020975,"sku":"LS50F-CO-B600+LS50-CO-AP95100","price":945.99,"currency_code":"USD","in_stock":true},{"title":"B1200 Blocking Filter \/ 55-60mm","offer_id":53917546053743,"sku":"LS50F-CO-B1200+LS50-CO-AP5560","price":995.99,"currency_code":"USD","in_stock":true},{"title":"B1200 Blocking Filter \/ 60-65mm","offer_id":53917546086511,"sku":"LS50F-CO-B1200+LS50-CO-AP6065","price":995.99,"currency_code":"USD","in_stock":true},{"title":"B1200 Blocking Filter \/ 65-70mm","offer_id":53917546119279,"sku":"LS50F-CO-B1200+LS50-CO-AP6570","price":995.99,"currency_code":"USD","in_stock":true},{"title":"B1200 Blocking Filter \/ 70-75mm","offer_id":53917546152047,"sku":"LS50F-CO-B1200+LS50-CO-AP7075","price":995.99,"currency_code":"USD","in_stock":true},{"title":"B1200 Blocking Filter \/ 75-80mm","offer_id":53917546184815,"sku":"LS50F-CO-B1200+LS50-CO-AP7580","price":995.99,"currency_code":"USD","in_stock":true},{"title":"B1200 Blocking Filter \/ 80-85mm","offer_id":53917546217583,"sku":"LS50F-CO-B1200+LS50-CO-AP8085","price":995.99,"currency_code":"USD","in_stock":true},{"title":"B1200 Blocking Filter \/ 85-90mm","offer_id":53917546250351,"sku":"LS50F-CO-B1200+LS50-CO-AP8590","price":995.99,"currency_code":"USD","in_stock":true},{"title":"B1200 Blocking Filter \/ 90-95mm","offer_id":53917546283119,"sku":"LS50F-CO-B1200+LS50-CO-AP9095","price":995.99,"currency_code":"USD","in_stock":true},{"title":"B1200 Blocking Filter \/ 95-100mm","offer_id":53917546315887,"sku":"LS50F-CO-B1200+LS50-CO-AP95100","price":995.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0717\/7968\/0367\/files\/IMG_6136-min.jpg?v=1785527446","url":"https:\/\/telescopedepot.com\/products\/lunt-50mm-center-obstructed-h-alpha-filter-set","provider":"Telescope Depot","version":"1.0","type":"link"}