{"product_id":"svbony-sv132-2-h-beta-filter","title":"SVBONY SV132 2″ H-Beta 25nm Visual Nebula Filter","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387029296852401851663295.jpg\" alt=\"SVBONY SV132 2 inch H-Beta 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 is a 2″ H-Beta narrowband filter for visual observing. It passes a 25 nm ± 2 nm band centred on 486 nm ± 2 nm — the hydrogen-beta emission line — at a published 90% peak transmission, and blocks to OD3 across 300–1100 nm. The filter is coated on a 1.85 mm B270 substrate with a 44 mm clear aperture, 60\/40 surface quality and 1\/4λ surface parallelism, mounted in a metal cell with standard 2″ threads.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387029138875923094057798.jpg\" alt=\"SVBONY SV132 2 inch H-Beta filter 486nm passband\" 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 larger-aperture telescope under dark skies, and want the handful of objects that shine mainly in H-beta — the Horsehead, California and Cocoon nebulae among them — to stand out from the 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 nm FWHM isolates the blue hydrogen-beta line and suppresses the rest of the visible spectrum.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e90% peak transmission:\u003c\/strong\u003e keeps as much of the target's light as possible at the eyepiece.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOD3 blocking, 300–1100 nm:\u003c\/strong\u003e broad out-of-band suppression.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eB270 substrate, 1.85 mm:\u003c\/strong\u003e 60\/40 surface quality, 1\/4λ surface parallelism, 30″ parallelism.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e44 mm clear aperture:\u003c\/strong\u003e sized for 2″ eyepieces and diagonals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMetal cell with 2″ threads:\u003c\/strong\u003e precise threading that seals against light leaks.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387029297672830308590636.jpg\" alt=\"SVBONY SV132 2 inch H-Beta filter nebula targets\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387029298407016527982995.jpg\" alt=\"SVBONY SV132 2 inch H-Beta filter coating and substrate\" 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 the IC 434 glow — the classic H-beta target.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe California Nebula (NGC 1499)\u003c\/strong\u003e, whose large, faint outline benefits from a low-power 2″ eyepiece.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Cocoon Nebula (IC 5146)\u003c\/strong\u003e and other H-beta-bright emission regions.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThreads:\u003c\/strong\u003e standard 2″ filter thread; screws into 2″ eyepiece barrels and threaded 2″ diagonal nosepieces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAperture:\u003c\/strong\u003e SVBONY recommends a large-aperture telescope; small apertures do not gather enough light for these faint targets through a narrow passband.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSky:\u003c\/strong\u003e the target nebulae are best seen from dark sites.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNeed the 1.25″ size?\u003c\/strong\u003e SVBONY also makes the SV132 H-Beta in 1.25″.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387029299118711613838191.jpg\" alt=\"SVBONY SV132 2 inch H-Beta filter cell and thread\" 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 short list of objects. For broader nebula work, an OIII or UHC-type filter covers more targets.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAperture matters:\u003c\/strong\u003e SVBONY does not recommend it for small-aperture telescopes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisual filter:\u003c\/strong\u003e it is designed for eyepiece use.\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. It threads onto the barrel of a 2″ eyepiece or into the nosepiece of a threaded 2″ diagonal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat can I see with an H-Beta filter?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eMainly emission nebulae that are bright in hydrogen-beta, such as the Horsehead, California and Cocoon nebulae.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat size telescope do I need?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eSVBONY recommends a large-aperture telescope; small apertures are not recommended with this filter.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill it help in light-polluted skies?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eIts targets are best observed from dark sites; the filter boosts contrast on them but does not replace a dark sky.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 2″, 25 nm H-Beta filter at 486 nm with 90% peak transmission, made for bringing out the Horsehead, California and Cocoon nebulae in a larger telescope under dark skies.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003ePerformance Data\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eSVBONY's published transmission data for the SV132:\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387037662225298411081831.jpg\" alt=\"SVBONY SV132 2 inch H-Beta filter transmission curve\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"Default Title","offer_id":67722198351983,"sku":"W9102B","price":74.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/1_20250806114107_5087_20260810145311_1602.webp?v=1791669990","url":"https:\/\/ontariotelescope.com\/products\/svbony-sv132-2-h-beta-filter","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}