{"product_id":"svbony-sv132-1-25-h-beta-filter","title":"SVBONY SV132 1.25″ H-Beta 25nm Nebula Filter","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6372991326672431911273645.jpg?v=1791669868\" alt=\"SVBONY SV132 1.25 inch H-Beta 25nm filter key visual\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe SVBONY SV132 1.25″ (item W9102A) is an H-Beta narrowband filter for visual observing. It transmits 80% at 486 nm — the hydrogen-beta emission line — with a 25 ± 3 nm bandwidth, and holds mercury (435 nm, 578 nm) and sodium (589 nm) lines to 0.1% transmission. The 1.85 mm glass is double-side polished to 1\/4-wave accuracy and coated in a planetary-rotation chamber for an even coating, mounted in a metal cell with the standard M28.5 × 0.6 1.25″ thread.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6_20250806105406_8434_20260820155431_1753.webp?v=1791670290\" alt=\"SVBONY SV132 1.25 inch H-Beta 25nm filter for visual nebula observing\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you observe faint emission nebulae visually through a moderate- to large-aperture telescope with 1.25″ eyepieces, and want the H-beta-bright objects — the Horsehead and California nebulae above all — to separate from the sky background.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e486 nm H-beta passband:\u003c\/strong\u003e 25 ± 3 nm FWHM with 80% transmission at the line.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLight-pollution rejection:\u003c\/strong\u003e 0.1% transmission at the Hg 435\/578 nm and Na 589 nm lines.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDouble-side polished, 1\/4 wave:\u003c\/strong\u003e with tight parallelism, which SVBONY credits with halo-free views around bright stars.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUniform vacuum-deposited coating:\u003c\/strong\u003e applied with a planetary rotation system.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMetal cell, M28.5 × 0.6:\u003c\/strong\u003e fits 1.25″ eyepieces and threaded diagonal barrels.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/1_20250806105707_5061.jpg?v=1791670290\" alt=\"SVBONY SV132 1.25 inch H-Beta filter for Horsehead Nebula viewing\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Horsehead Nebula (B33)\u003c\/strong\u003e against IC 434.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eThe California Nebula (NGC 1499).\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOther emission nebulae:\u003c\/strong\u003e SVBONY also lists M42, planetary nebulae and supernova remnants among suitable targets.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/2_20250806105707_3608.jpg?v=1791670290\" alt=\"SVBONY SV132 1.25 inch H-Beta filter coated glass\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread:\u003c\/strong\u003e M28.5 × 0.6, for 1.25″ eyepieces and threaded 1.25″ diagonal barrels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTelescope:\u003c\/strong\u003e SVBONY recommends moderate to large apertures and dark skies for the faintest targets.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2″ version:\u003c\/strong\u003e SVBONY also makes the SV132 in 2″.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/3_20250806105707_4351.jpg?v=1791670290\" alt=\"SVBONY SV132 1.25 inch H-Beta filter metal cell\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecialist filter:\u003c\/strong\u003e H-beta enhances a relatively short list of objects; an OIII or UHC-type filter covers more nebulae.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAperture and sky:\u003c\/strong\u003e the faint H-beta targets reward larger apertures and dark sites.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e not published by SVBONY.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. Thread it onto the bottom of a 1.25″ eyepiece or into a threaded diagonal barrel.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat will an H-Beta filter show me?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eMainly nebulae that are bright in hydrogen-beta, with the Horsehead and California nebulae the best-known examples.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it block light pollution?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIt holds the main mercury and sodium lines to 0.1%, though the faintest H-beta targets still look best from dark skies.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill it fit my eyepieces?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIt fits any 1.25″ eyepiece with the standard M28.5 × 0.6 filter thread.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 1.25″, 25 nm H-Beta filter passing 80% at 486 nm and blocking Hg and Na lines to 0.1%, made for bringing out the Horsehead, California and other H-beta nebulae.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"Default Title","offer_id":67722264510575,"sku":"W9102A","price":67.25,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6_20250806105406_8434_20260820155431_1753.webp?v=1791670290","url":"https:\/\/ontariotelescope.com\/products\/svbony-sv132-1-25-h-beta-filter","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}