{"product_id":"svbony-sv160-2-oiii-7nm-narrowband-imaging-filter-w9121b","title":"SVBONY SV160 2″ OIII 7nm Narrowband Imaging Filter (W9121B)","description":"\u003cdiv style=\"background:#112c38;color:#fff;padding:24px;border-radius:12px\"\u003e\n\u003cp style=\"color:#75dce0;margin:0 0 8px\"\u003eSVBONY SV160 · W9121B · 2″ OIII · 7nm\u003c\/p\u003e\n\u003ch2 style=\"color:#fff\"\u003eIsolate oxygen emission. Reveal nebula structure.\u003c\/h2\u003e\n\u003cp\u003eA single-band oxygen-III filter for building dedicated OIII imaging data and combining it with your other narrowband channels.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp\u003eThe \u003cstrong\u003eSVBONY SV160 2-inch OIII 7nm filter\u003c\/strong\u003e is a mounted narrowband astrophotography filter for recording oxygen-III emission from suitable nebulae. Its \u003cstrong\u003enominal 7nm passband around 500nm\u003c\/strong\u003e helps reject unwanted background light while retaining the oxygen signal used in deep-sky imaging.\u003c\/p\u003e\n\u003cfigure style=\"margin:24px 0\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/svbony-2-oiii-deep-space-filter-w9121b-astronomy-plus-1_700x700_2e9c2600-1ecc-436f-bf09-9d0d045f3234.png?v=1794055302\" alt=\"SVBONY SV160 W9121B 2-inch OIII 7nm mounted imaging filter\" loading=\"lazy\" style=\"display:block;width:100%;max-width:700px;height:auto;margin:auto\"\u003e\u003c\/figure\u003e\n\u003ch2\u003eA dedicated OIII channel for narrowband imaging\u003c\/h2\u003e\u003cp\u003eThis filter is particularly useful with a monochrome astronomy camera when collecting a separate oxygen channel. Combine OIII data with separately captured H-alpha for a bicolour image, or add SII for a three-channel SHO workflow. H-alpha and SII filters are separate accessories.\u003c\/p\u003e\u003cp\u003eSuitable subjects include planetary nebulae and other nebulae with oxygen emission. The filter is less useful for broadband targets such as galaxies, reflection nebulae and star clusters, where rejecting most of the spectrum also removes much of the target’s light.\u003c\/p\u003e\n\u003ch2\u003e2-inch mounted format\u003c\/h2\u003e\u003cp\u003eThe filter fits compatible \u003cstrong\u003eM48 × 0.75 threaded\u003c\/strong\u003e holders, drawers and filter wheels that accept mounted 2-inch filters. The manufacturer-hosted review lists a \u003cstrong\u003e45mm clear aperture\u003c\/strong\u003e. Check your holder’s cell clearance and the filter-to-sensor distance: the mounted size alone does not guarantee an unvignetted image on every sensor.\u003c\/p\u003e\n\u003cfigure style=\"margin:24px 0\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/svbony-2-oiii-deep-space-filter-w9121b-astronomy-plus-6_700x700_46604d99-9afe-4330-b16e-7f3f512ec720.png?v=1794055302\" alt=\"SVBONY W9121B filter cell showing standard M48 x 0.75 mounting thread\" loading=\"lazy\" style=\"display:block;width:100%;max-width:700px;height:auto;margin:auto\"\u003e\u003c\/figure\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eBrand \/ model\u003c\/th\u003e\n\u003ctd\u003eSVBONY \/ SV160\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eManufacturer SKU\u003c\/th\u003e\n\u003ctd\u003eW9121B\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eFilter type\u003c\/th\u003e\n\u003ctd\u003eSingle-band oxygen-III narrowband imaging filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eMounted size\u003c\/th\u003e\n\u003ctd\u003e2-inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eNominal bandwidth\u003c\/th\u003e\n\u003ctd\u003e7nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eNominal passband centre\u003c\/th\u003e\n\u003ctd\u003eApproximately 500nm, targeting OIII emission\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eMounting thread\u003c\/th\u003e\n\u003ctd\u003eM48 × 0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eClear aperture\u003c\/th\u003e\n\u003ctd\u003e45mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003ePractical imaging advice\u003c\/h2\u003e\u003cp\u003eSet exposure time and total integration for your target and equipment rather than assuming one fixed setting. Bright-star halos can occur with narrowband filters and depend on the optical train; this filter should not be treated as halo-free. For very fast optics, check interference-filter suitability before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eThis listing supplies one W9121B OIII filter, not a complete SHO set.\u003c\/strong\u003e A camera, telescope and compatible holder are required separately.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFor astrophotography. This is not a solar filter.\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eBrowse our \u003ca href=\"\/collections\/svbony-telescope-filters\"\u003eSVBONY telescope filters\u003c\/a\u003e or ask Dark Clear Skies for help choosing the correct filter format.\u003c\/p\u003e","brand":"SVBONY","offers":[{"title":"Default Title","offer_id":55729331962232,"sku":"W9121B","price":99.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0523\/1650\/4241\/files\/svbony-2-oiii-deep-space-filter-w9121b-astronomy-plus-1_700x700_2e9c2600-1ecc-436f-bf09-9d0d045f3234.png?v=1794055302","url":"https:\/\/www.darkclearskies.co.uk\/products\/svbony-sv160-2-oiii-7nm-narrowband-imaging-filter-w9121b","provider":"Dark Clear Skies ","version":"1.0","type":"link"}