{"product_id":"svbony-sv164-2-dark-frame-filter","title":"SVBONY SV164 2″ Dark Frame Filter","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6371997501065360788822492.jpg?v=1791670356\" alt=\"SVBONY SV164 2″ dark 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 SV164 is a 2″ dark frame filter: an opaque, metal filter that blocks light from reaching the sensor. Placed in a filter wheel, it lets a camera without a mechanical shutter record dark calibration frames without removing the camera or capping the telescope. It is 1 mm thick with a standard M48 x 0.75 2″ thread.\u003c\/p\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/W9124B-0_20251231155106_9847.webp?v=1791670355\" alt=\"SVBONY SV164 2″ dark frame filter\" 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 with a CMOS or CCD astronomy camera and a 2″ filter wheel and want to automate dark frames at the end of a session, for example as part of a scripted capture sequence.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDark frame imaging filter:\u003c\/strong\u003e blocks light so the camera records only its own thermal signal and hot pixels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2″ format, M48 x 0.75 thread:\u003c\/strong\u003e fits a 2″ filter wheel position.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e1 mm thick, metal construction.\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6371997501063463743072860.jpg?v=1791670356\" alt=\"SVBONY SV164 2″ dark filter detail\" 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\u003eDark frames\u003c\/strong\u003e taken from a filter-wheel slot, with the camera left in place.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutomated calibration\u003c\/strong\u003e at the end of an imaging sequence.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/6371997501064547763208849.jpg?v=1791670356\" alt=\"SVBONY SV164 2″ dark filter thread detail\" 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\u003eFits:\u003c\/strong\u003e 2″ filter wheels and filter holders with M48 x 0.75 threads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThickness:\u003c\/strong\u003e 1 mm.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/2_20250806115715_0130.jpg?v=1791670356\" alt=\"SVBONY SV164 dark filter in its 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\u003eImaging only:\u003c\/strong\u003e it passes no light, so it has no application for visual observing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAmbient light:\u003c\/strong\u003e for the cleanest darks it is worth also keeping stray light away from the rest of the train, since the filter covers the optical path only at the wheel.\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 into a 2″ filter-wheel position like any other 2″ filter; set that slot as your dark position in your capture software.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy use a dark filter instead of a lens cap?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eThe filter wheel can switch to it automatically, so darks can be captured without anyone at the telescope.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes it work with 1.25″ wheels?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo. It is a 2″, M48 x 0.75 filter.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eIn short: a 1 mm, 2″ M48 opaque filter that turns a filter-wheel slot into a shutter for unattended dark frames.\u003c\/p\u003e","brand":"SvBony","offers":[{"title":"Default Title","offer_id":67722277781615,"sku":"W9124B","price":19.14,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/W9124B-0_20251231155106_9847.webp?v=1791670355","url":"https:\/\/ontariotelescope.com\/products\/svbony-sv164-2-dark-frame-filter","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}