{"product_id":"svbony-sv220-2-7nm-h-alpha-oiii-dual-band-filter","title":"SVBONY SV220 2″ 7nm H-Alpha \u0026 OIII Dual-Band Filter","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6381369372334549875781772.jpg?v=1791667852\" alt=\"SVBONY SV220 7nm H-alpha and OIII dual-band 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 SV220 is a 2″ dual-band narrowband filter with two 7 nm passbands, one centred on OIII at 500.7 nm and one on H-alpha at 656.3 nm. SVBONY rates peak transmission above 90% at OIII and above 94% at H-alpha, with OD5 blocking across a 300–1100 nm working range. The filter is built on a 1.80 mm substrate with a 44 mm clear aperture, 60\/40 surface quality and 1\/4λ parallelism, mounted in an M48 x 0.75 cell. It weighs 12.5 g.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6381369375177755491276519.jpg?v=1791667852\" alt=\"SVBONY SV220 dual-band filter bringing out deep-sky nebula detail\" 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\/6381369376798699968785762.jpg?v=1791667852\" alt=\"SVBONY SV220 OIII and H-alpha 7nm passbands reducing light pollution\" 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 image emission nebulae with a one-shot-colour camera, especially from a suburban or city backyard, or when the Moon is up. Because both emission lines pass in a single exposure, a colour camera records hydrogen and oxygen detail together without a filter wheel.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6387244835527968301332234.jpg?v=1791667852\" alt=\"SVBONY SV220 dual-band filter key features and design\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwo 7 nm passbands:\u003c\/strong\u003e isolates OIII (500.7 nm) and H-alpha (656.3 nm) emission and rejects most of the spectrum between and around them.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh line transmission:\u003c\/strong\u003e T\u0026gt;90% at OIII and T\u0026gt;94% at H-alpha.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOD5 blocking:\u003c\/strong\u003e suppresses mercury-vapour and sodium-vapour street lighting, airglow from atmospheric neutral oxygen, and general sky glow.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptical quality:\u003c\/strong\u003e 60\/40 surface quality and 1\/4λ surface parallelism on a 1.80 mm substrate.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2″ M48 x 0.75 cell:\u003c\/strong\u003e 44 mm clear aperture for larger sensors and 2″ imaging trains.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6381369380564452768498194.jpg?v=1791667852\" alt=\"SVBONY SV220 dual-band filter OD5 blocking and optical quality\" 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\/6381369382041458956095111.jpg?v=1791667852\" alt=\"SVBONY SV220 nebula imaging from light-polluted city or under a full moon\" 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\/6381369384090793743066059.jpg?v=1791667851\" alt=\"SVBONY SV220 dual-band filter recommended uses for emission nebulae\" 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\u003eEmission nebulae:\u003c\/strong\u003e hydrogen regions such as the North America, Rosette and Heart nebulae.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlanetary nebulae and supernova remnants:\u003c\/strong\u003e targets where OIII and H-alpha structure carry the image.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLight-polluted or moonlit imaging:\u003c\/strong\u003e narrow passbands keep the sky background dark from urban sites.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBicolour (HOO) processing:\u003c\/strong\u003e the two lines can be separated from colour-camera data in processing.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6381369386228837255680093.jpg?v=1791667852\" alt=\"SVBONY SV220 dual-band filter nebula imaging applications\" 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\/6381369387402006221181094.jpg?v=1791667852\" alt=\"SVBONY SV220 2-inch M48 filter compatibility\" 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\/6381369389728950705111721.jpg?v=1791667852\" alt=\"SVBONY SV220 dual-band filter use with colour cameras and imaging trains\" 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 M48 x 0.75, the standard 2″ filter thread, for 2″ filter drawers, filter wheels, camera adapters and 2″ nosepieces with filter threads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCameras:\u003c\/strong\u003e designed as an OSC (one-shot-colour) filter; it also works with mono cameras.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFocal ratio:\u003c\/strong\u003e SVBONY rates it for telescopes at f\/4 and slower.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSHO colour with a colour camera:\u003c\/strong\u003e SVBONY pairs it with the SV220 2″ 7nm SII \u0026amp; OIII filter, which supplies the sulphur data for a Hubble-palette blend.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilter drawers:\u003c\/strong\u003e the SVBONY SV226 filter drawers take 2″ M48 filters for quick swapping without removing the camera.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6381369391629416504375686.jpg?v=1791667852\" alt=\"SVBONY SV220 2-inch filter compatibility and accessory details\" 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\/6381369393049881724054907.jpg?v=1791667852\" alt=\"SVBONY SV220 dual-band filter details to know before ordering\" 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\/6381369394335091831892928.jpg?v=1791667852\" alt=\"SVBONY SV220 dual-band filter construction details\" 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\u003eImaging only:\u003c\/strong\u003e the filter is designed for cameras and has no application for eyepiece viewing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot a solar filter:\u003c\/strong\u003e it provides no protection for observing or imaging the Sun.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast optics:\u003c\/strong\u003e narrowband passbands shift toward shorter wavelengths in a steep light cone, which can clip the H-alpha line. SVBONY specifies f\/4 or slower, which excludes f\/2 systems such as RASA-type astrographs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e this listing is the 2″ M48 version. SVBONY also makes a 1.25″ SV220 with an M28.5 x 0.6 thread.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSingle thread:\u003c\/strong\u003e the cell is threaded on one side.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6381369395503526377102669.jpg?v=1791667852\" alt=\"SVBONY SV220 dual-band filter cell and thread details\" 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\/6381369396725901629739765.jpg?v=1791667852\" alt=\"SVBONY SV220 dual-band filter performance data\" 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\/6381369398047470475187046.jpg?v=1791667852\" alt=\"SVBONY SV220 dual-band filter specifications\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\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 into any M48 x 0.75 filter thread or drops into a 2″ filter drawer slot, and focus is set as usual with the filter in place.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use it with a DSLR or colour astronomy camera?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eYes. It is designed for one-shot-colour sensors, which record H-alpha in the red channel and OIII in the green and blue channels in a single exposure.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill it work on my f\/2 astrograph?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eSVBONY specifies f\/4 or slower. Below that, band shift can push the H-alpha line outside the passband. If you are unsure where your system sits, send us the telescope and reducer details and we will check it with you.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow does it compare with a broadband light-pollution filter?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eA broadband filter passes several wide windows and suits galaxies and star fields. The SV220's 7 nm passbands pass far less sky glow and suit emission nebulae, at the cost of star colour.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 2″ M48 dual-band filter with 7 nm H-alpha and OIII passbands and OD5 blocking, for colour-camera nebula imaging from bright skies on telescopes at f\/4 and slower.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"Default Title","offer_id":67721425649775,"sku":"W9172B","price":173.85,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/W9172B_20260623173702_8974_20260806133410_4267.webp?v=1791665208","url":"https:\/\/ontariotelescope.com\/products\/svbony-sv220-2-7nm-h-alpha-oiii-dual-band-filter","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}