{"title":"ZWO EFW Electronic Filter Wheels","description":"\u003cp\u003eZWO EFW electronic filter wheels let a mono camera switch filters under software control during a sequence, from an ASIAIR or ASCOM software. The EFW Gen2 range comes in 5 x 1.25\", 8 x 1.25\", 7 x 36mm, 5 x 2\" and 7 x 2\" versions, alongside a 7 x 50mm square wheel and an 8 x 1.25\" or 31mm model.\u003c\/p\u003e\u003cp\u003eMatch the filter size to your sensor. EOS and Nikon lens adapters let you image through camera lenses with a filter wheel in place.\u003c\/p\u003e","products":[{"product_id":"zwo-efw-8-x-1-25-or-31mm","title":"ZWO EFW - 8 x 1.25\" or 31mm","description":"\u003cul class=\"DAV-feature-list\"\u003e\n    \u003cli\u003e\n        For 1.25\" or 31mm filters\n    \u003c\/li\u003e\n    \u003cli\u003e\n        Easy to install on the telescope and the camera\n    \u003c\/li\u003e\n    \u003cli\u003e\n        Filters are easy to install\n    \u003c\/li\u003e\n    \u003cli\u003e\n        Made with NPM Stepper Motor from Japan\n    \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n    \u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n    \u003cli\u003eDiagrams \u0026amp; Resources\u003c\/li\u003e\n    \u003cli\u003eIn the Box\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n    \u003cli class=\"active\"\u003e       \n        \u003cdiv\u003e\n            \u003c!-- Title image text --\u003e\n            \u003cdiv class=\"DAV-bg-light\"\u003e\n                \u003c!-- Main Image --\u003e\n                \u003cdiv class=\"DAV-section-center\"\u003e\n                    \u003ch2\u003eZWO EFW 8 x 1.25″\/31mm Electronic Filter Wheel - Overview\u003c\/h2\u003e\n                    \u003cp\u003e\n                        Compact, Lightweight, and Reliable\n                    \u003c\/p\u003e\n                    \u003cp\u003e\n                        The ZWO EFW (Electronic Filter Wheel), larger yet impressively lightweight at just 400 grams (14 oz), is the ideal choice for astrophotographers seeking precision and simplicity in filter management.\n                    \u003c\/p\u003e\n                \u003c\/div\u003e\n            \u003c\/div\u003e\n            \n            \u003cdiv class=\"DAV-section-container\"\u003e\n                \u003cdiv class=\"DAV-section-img\"\u003e\n                    \u003cimg src=\"https:\/\/i.zwoastro.com\/wp-content\/uploads\/2022\/11\/20f5cedd84256b50847ecab4815be0b4.jpg\" alt=\"ZWO EFW 8 x 1.25″\/31mm Electronic Filter Wheel - Slim and Sturdy Design\"\u003e\n                \u003c\/div\u003e\n\n                \u003cdiv class=\"DAV-section-text\"\u003e\n                    \u003ch3\u003e\n                        Slim and Sturdy Design\n                    \u003c\/h3\u003e                \n                    \u003cp\u003e\n                        CNC-milled from aircraft-grade aluminum for durability.\n                    \u003c\/p\u003e\n                    \u003cp\u003e\n                        Ultra-thin design with a body thickness of just 20 mm, ensuring portability and easy integration into your astrophotography setup.\n                    \u003c\/p\u003e\n                \u003c\/div\u003e\n            \u003c\/div\u003e\n\n            \u003cdiv class=\"DAV-section-container\"\u003e\n                \u003cdiv class=\"DAV-section-text\"\u003e\n                    \u003ch3\u003e\n                        High-Quality Stepper Motor\n                    \u003c\/h3\u003e                \n                    \u003cp\u003e\n                        Powered by a reliable NPM stepper motor from Japan, ensuring long-lasting performance and smooth, precise filter rotation.\n                    \u003c\/p\u003e\n                \u003c\/div\u003e\n\n                \u003cdiv class=\"DAV-section-img\"\u003e\n                    \u003cimg src=\"https:\/\/i.zwoastro.com\/wp-content\/uploads\/2022\/11\/fdb518c99db577d8cf73e1d298e469a4.jpg\" alt=\"ZWO EFW 8 x 1.25″\/31mm Electronic Filter Wheel - High-Quality Stepper Motor\"\u003e\n                \u003c\/div\u003e\n            \u003c\/div\u003e\n\n            \u003cdiv class=\"DAV-section-container\"\u003e\n                \u003cdiv class=\"DAV-section-text\"\u003e\n                    \u003ch3\u003e\n                        Efficient Power Usage\n                    \u003c\/h3\u003e                \n                    \u003cp\u003e\n                        Operates with a single USB cable for both power and control.\n                    \u003c\/p\u003e\n                    \u003cp\u003e\n                        Power consumption is approximately 120mA @ 5V, allowing operation directly through the USB hub of a Cooled ASI Camera.\n                    \u003c\/p\u003e\n                \u003c\/div\u003e\n            \u003c\/div\u003e\n\n            \u003cdiv class=\"DAV-section-container\"\u003e\n                \u003cdiv class=\"DAV-section-text\"\u003e\n                    \u003ch3\u003e\n                        Filter Compatibility\n                    \u003c\/h3\u003e                \n                    \u003cp\u003e\n                        1.25″ filters: No vignetting with telescopes up to an f\/5 focal ratio.\n                    \u003c\/p\u003e\n                    \u003cp\u003e\n                        31mm filters: No vignetting with lenses up to f\/2.\n                    \u003c\/p\u003e\n                \u003c\/div\u003e\n            \u003c\/div\u003e\n\n            \u003cdiv class=\"DAV-section-container\"\u003e\n                \u003cdiv class=\"DAV-section-img\"\u003e\n                    \u003cimg src=\"https:\/\/i.zwoastro.com\/wp-content\/uploads\/2022\/11\/1895f678be061f77d17fd06a214ee97b.jpg\" alt=\"ZWO EFW 8 x 1.25″\/31mm Electronic Filter Wheel - Installation Instructions for 1.25 filters\"\u003e\n                \u003c\/div\u003e\n\n                \u003cdiv class=\"DAV-section-text\"\u003e\n                    \u003ch3\u003e\n                        Installation Instructions - For 1.25\" Filters\n                    \u003c\/h3\u003e                \n                    \u003col\u003e\n                        \u003cli\u003eEnsure filters are threaded (length \u0026lt; 3mm) or unthreaded (height \u0026lt; 7mm).\u003c\/li\u003e\n                        \u003cli\u003eRemove the back cover of the EFW.\u003c\/li\u003e\n                        \u003cli\u003eLay the wheel flat and screw in the filters.\u003c\/li\u003e\n                        \u003cli\u003eReattach the back cover.\u003c\/li\u003e\n                    \u003c\/ol\u003e\n                \u003c\/div\u003e\n            \u003c\/div\u003e\n\n            \u003cdiv class=\"DAV-section-container\"\u003e\n                \u003cdiv class=\"DAV-section-text\"\u003e\n                    \u003ch3\u003e\n                        Installation Instructions - For 31mm Filters\n                    \u003c\/h3\u003e                \n                    \u003col\u003e\n                        \u003cli\u003eUse the included M2 screws and washers.\u003c\/li\u003e\n                        \u003cli\u003eRemove the back cover and lay the wheel flat.\u003c\/li\u003e\n                        \u003cli\u003eCarefully place filters into the designated recesses.\u003c\/li\u003e\n                        \u003cli\u003eAttach washers and secure with screws.\u003c\/li\u003e\n                        \u003cli\u003eReattach the back cover.\u003c\/li\u003e\n                    \u003c\/ol\u003e\n                \u003c\/div\u003e\n\n                \u003cdiv class=\"DAV-section-img\"\u003e\n                    \u003cimg src=\"https:\/\/i.zwoastro.com\/wp-content\/uploads\/2022\/11\/f38717e0038979dd2c25aa97aa2d1c66.jpg\" alt=\"ZWO EFW 8 x 1.25″\/31mm Electronic Filter Wheel - Installation Instructions - For 31mm Filters\"\u003e\n                \u003c\/div\u003e\n            \u003c\/div\u003e\n\n            \u003cdiv class=\"DAV-section-container\"\u003e\n                \u003cdiv class=\"DAV-section-text\"\u003e\n                    \u003ch3\u003e\n                        Ease of Use\n                    \u003c\/h3\u003e                \n                    \u003col\u003e\n                        \u003cli\u003eConnect the EFW via the included USB 2.0 cable.\u003c\/li\u003e\n                        \u003cli\u003eInstall the ASCOM driver to begin operation.\u003c\/li\u003e\n                        \u003cli\u003eControl the EFW via ZWO Filter Wheel (1) or ZWO Filter Wheel (2), allowing simultaneous control of two EFWs within compatible software.\u003c\/li\u003e\n                    \u003c\/ol\u003e\n                \u003c\/div\u003e\n            \u003c\/div\u003e\n        \u003c\/div\u003e\n    \u003c\/li\u003e\n    \n    \u003cli\u003e\n        \u003ch2\u003eMechanical Diagram\u003c\/h2\u003e\n        \u003cimg src=\"https:\/\/i.zwoastro.com\/wp-content\/uploads\/2022\/11\/7a159a536f47c017eb492297bb45c270-1.png\" alt=\"ZWO EFW 8 x 1.25″\/31mm Electronic Filter Wheel - Diagram\" class=\"\"\u003e\n        \u003ch2\u003eHow to connect with the camera and telescope?\u003c\/h2\u003e\n        \u003cimg src=\"https:\/\/i.zwoastro.com\/wp-content\/uploads\/2022\/11\/8e9267a03f4d32e6fb335580c7f87977.png\" alt=\"ZWO EFW 8 x 1.25″\/31mm Electronic Filter Wheel - How to connect with the camera and telescope?\"\u003e\n    \u003c\/li\u003e\n\n    \u003cli\u003e\n        \u003cul class=\"DAV-grid\"\u003e\n            \u003cli class=\"DAV-grid-item\"\u003e\n                \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/ZWO_8x1.25-31_-_efw_body.png?v=1737476229\" alt=\"ZWO EFW 8 x 1.25″\/31mm Electronic Filter Wheel - In The Box\" class=\"DAV-img-box\"\u003e\n                \u003cdiv\u003e\n                    \u003cp class=\"DAV-item-title\"\u003e\n                        8x31mm EFW body\n                    \u003c\/p\u003e\n                    \u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n                \u003c\/div\u003e\n            \u003c\/li\u003e\n            \u003cli class=\"DAV-grid-item\"\u003e\n                \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/ZWO_8x1.25-31_-_1.25_cover.png?v=1737476229\" alt=\"ZWO EFW 8 x 1.25″\/31mm Electronic Filter Wheel - In The Box\" class=\"DAV-img-box\"\u003e\n                \u003cdiv\u003e\n                    \u003cp class=\"DAV-item-title\"\u003e\n                        1.25″ cover\n                    \u003c\/p\u003e\n                    \u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n                \u003c\/div\u003e\n            \u003c\/li\u003e\n            \u003cli class=\"DAV-grid-item\"\u003e\n                \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/ZWO_8x1.25-31_-_1.25T_Nosepiece.png?v=1737476229\" alt=\"ZWO EFW 8 x 1.25″\/31mm Electronic Filter Wheel - In The Box\" class=\"DAV-img-box\"\u003e\n                \u003cdiv\u003e\n                    \u003cp class=\"DAV-item-title\"\u003e\n                        T2 nosepiece\n                    \u003c\/p\u003e\n                    \u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n                \u003c\/div\u003e\n            \u003c\/li\u003e\n            \u003cli class=\"DAV-grid-item\"\u003e\n                \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/ZWO_8x1.25-31_-_1.25_holder.png?v=1737476229\" alt=\"ZWO EFW 8 x 1.25″\/31mm Electronic Filter Wheel - In The Box\" class=\"DAV-img-box\"\u003e\n                \u003cdiv\u003e\n                    \u003cp class=\"DAV-item-title\"\u003e\n                        1.25″ holder(with cover and 2 screws)\n                    \u003c\/p\u003e\n                    \u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n                \u003c\/div\u003e\n            \u003c\/li\u003e\n            \u003cli class=\"DAV-grid-item\"\u003e\n                \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/ZWO_8x1.25-31_-_T2-T2_Adapter.png?v=1737476229\" alt=\"ZWO EFW 8 x 1.25″\/31mm Electronic Filter Wheel - In The Box\" class=\"DAV-img-box\"\u003e\n                \u003cdiv\u003e\n                    \u003cp class=\"DAV-item-title\"\u003e\n                        T2-T2 adapter(male)\n                    \u003c\/p\u003e\n                    \u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n                \u003c\/div\u003e\n            \u003c\/li\u003e\n            \u003cli class=\"DAV-grid-item\"\u003e\n                \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/ZWO_8x1.25-31_-_A_bag_of_filter_masks.png?v=1737476229\" alt=\"ZWO EFW 8 x 1.25″\/31mm Electronic Filter Wheel - In The Box\" class=\"DAV-img-box\"\u003e\n                \u003cdiv\u003e\n                    \u003cp class=\"DAV-item-title\"\u003e\n                        A bag of filter masks (9pcs\/bag)\n                    \u003c\/p\u003e\n                    \u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n                \u003c\/div\u003e\n            \u003c\/li\u003e\n            \u003cli class=\"DAV-grid-item\"\u003e\n                \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/ZWO_8x1.25-31_-_USB2.0_Cable.png?v=1737476229\" alt=\"ZWO EFW 8 x 1.25″\/31mm Electronic Filter Wheel - In The Box\" class=\"DAV-img-box\"\u003e\n                \u003cdiv\u003e\n                    \u003cp class=\"DAV-item-title\"\u003e\n                        USB2.0 2m cable\n                    \u003c\/p\u003e\n                    \u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n                \u003c\/div\u003e\n            \u003c\/li\u003e\n            \u003cli class=\"DAV-grid-item\"\u003e\n                \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/ZWO_8x1.25-31_-_Philips_Screwdriver.png?v=1737476229\" alt=\"ZWO EFW 8 x 1.25″\/31mm Electronic Filter Wheel - In The Box\" class=\"DAV-img-box\"\u003e\n                \u003cdiv\u003e\n                    \u003cp class=\"DAV-item-title\"\u003e\n                        Phillips screwdriver\n                    \u003c\/p\u003e\n                    \u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n                \u003c\/div\u003e\n            \u003c\/li\u003e\n            \u003cli class=\"DAV-grid-item\"\u003e\n                \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/ZWO_8x1.25-31_-_Bag_of_M2_4_screws.png?v=1737476229\" alt=\"ZWO EFW 8 x 1.25″\/31mm Electronic Filter Wheel - In The Box\" class=\"DAV-img-box\"\u003e\n                \u003cdiv\u003e\n                    \u003cp class=\"DAV-item-title\"\u003e\n                        A bag of M2 screws\n                    \u003c\/p\u003e\n                    \u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n                \u003c\/div\u003e\n            \u003c\/li\u003e\n            \u003c!-- Add more items as needed --\u003e\n        \u003c\/ul\u003e          \n    \u003c\/li\u003e\n\n\u003c\/ul\u003e","brand":"ZWO","offers":[{"title":"Default Title","offer_id":44967437107485,"sku":"ZWO-EFW-8x1.25","price":335.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/ZWO-EFW-8-x-1-25-inch-or-31mm-7-x-36mm-1__90591.1596910055.1280.1280.jpg?v=1684341916"},{"product_id":"zwo-eos-lens-adapter-for-efw","title":"ZWO EOS Lens Adapter for EFW","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConnects Canon EF lenses to ZWO Electronic Filter Wheels (EFW); EF-S lenses are not supported\u003c\/li\u003e\n\u003cli\u003eEngineered for ZWO cameras with 6.5mm back focus (e.g., ASI1600)\u003c\/li\u003e\n\u003cli\u003eAdds 17.5mm of spacing to complete the 44mm Canon EF flange distance (6.5mm + 20mm EFW + 17.5mm)\u003c\/li\u003e\n\u003cli\u003eSecond-generation design with an improved, secure locking mechanism\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eZWO EFW-EOS Lens Adapter for 6.5mm Back Focus Cameras\u003c\/h2\u003e\n\u003cp\u003eThe ZWO EFW-EOS Adapter is the essential mechanical link for attaching Canon EF lenses to a ZWO Electronic Filter Wheel (EFW) and a cooled camera with 6.5mm of back focus. This second-generation adapter features an improved locking mechanism and adds the 17.5mm of spacing needed to reach the 44mm Canon EF flange distance, enabling you to use your high-quality camera lenses for wide-field astrophotography with filters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eCanon Lens Integration for 6.5mm ZWO Cameras\u003c\/h3\u003e\n\u003cp\u003eThis adapter solves the specific back focus challenge of using Canon EF lenses with ZWO's popular 6.5mm back focus cameras, like the ASI1600 series, and an EFW. By bridging the mechanical and spacing gap, it enables wide-field imaging with proven telephoto optics, correctly establishing the 17.5mm distance required for a sharp, flat field with a filter wheel in the optical train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eGeneration II Locking Mechanism\u003c\/h3\u003e\n\u003cp\u003eAs the second-generation version, this ZWO EFW-EOS adapter has been redesigned with a more robust and secure locking mechanism. You gain a more rigid connection between your lens and filter wheel, minimizing tilt and ensuring your optical train remains perfectly collinear throughout an imaging session, even with heavier telephoto lenses.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRigid Connection:\u003c\/strong\u003e Reduces the potential for flexure and optical tilt compared to the first-generation model.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSecure Mounting:\u003c\/strong\u003e Confidently attach heavy lenses without worrying about slippage or unwanted rotation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eASI1600 \u0026amp; EFW Wide-Field Imaging\u003c\/h3\u003e\n\u003cp\u003eThe primary use for this adapter is pairing a workhorse camera like the ZWO ASI1600 with a 7 or 8-position EFW and your existing Canon lenses. This combination turns your camera lens into a powerful, compact astrograph for capturing large targets like the Andromeda Galaxy (M31) or the Rho Ophiuchi cloud complex without requiring a telescope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the purpose of the ZWO EFW-EOS adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis adapter allows you to connect a \u003cstrong\u003eCanon EF lens\u003c\/strong\u003e (EF-S lenses are not supported) to a \u003cstrong\u003eZWO Electronic Filter Wheel (EFW)\u003c\/strong\u003e, which is then connected to a ZWO camera with \u003cstrong\u003e6.5mm of back focus\u003c\/strong\u003e. Its 17.5mm length, added to the camera's 6.5mm and the EFW's 20mm, gives the 44mm Canon EF flange distance needed for sharp focus across the entire sensor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I use this adapter to image the North American Nebula (NGC 7000) with my Canon lens and ASI1600?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAttach your Canon lens to this adapter, thread the adapter onto the front of your ZWO EFW, and then connect your ZWO ASI1600 camera to the back of the EFW. This creates a rigid, wide-field imaging rig perfect for large emission nebulae like NGC 7000, allowing you to use narrowband or LRGB filters with your camera lens.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the ZWO EFW-EOS adapter work with a full-frame camera like the ASI6200MC Pro?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this adapter is specifically designed for ZWO cameras with a \u003cstrong\u003e6.5mm back focus\u003c\/strong\u003e. Cameras like the ASI6200MC Pro have a different native back focus (17.5mm) and require a different adapter solution for use with Canon lenses and a filter wheel.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main improvement in this second-generation ZWO EFW-EOS adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe key improvement is a redesigned, more secure \u003cstrong\u003elocking mechanism\u003c\/strong\u003e. This ensures a tighter, more rigid connection to the Canon lens, which is critical for preventing optical tilt and flexure, especially when using heavier telephoto lenses.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I control the aperture of my Canon EF lens with this adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, the ZWO EFW-EOS adapter provides a purely \u003cstrong\u003emechanical connection\u003c\/strong\u003e. It does not transmit electronic signals for aperture or autofocus control. Aperture must be set on the lens itself, if the lens has a manual aperture ring.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need this adapter to connect my Canon lens directly to a ZWO camera without a filter wheel?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this adapter is specifically for integrating a ZWO Electronic Filter Wheel (EFW) into the imaging train. For a direct camera-to-lens connection, you would need a different ZWO EOS-T2 adapter designed for that purpose.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSKU Number\u003c\/td\u003e\n\u003ctd\u003eZWO-EFW-EOS-II\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Mount\u003c\/td\u003e\n\u003ctd\u003eCanon EF (EF-S not supported)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Side Connection\u003c\/td\u003e\n\u003ctd\u003eZWO EFW (Electronic Filter Wheel)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRequired Camera Back Focus\u003c\/td\u003e\n\u003ctd\u003e6.5 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAdapter Optical Length\u003c\/td\u003e\n\u003ctd\u003e17.5 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eFilter Wheel Adapter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eShort EOS Adapter for EFW (Gen II)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.zwoastro.com\/software\/\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/zwo-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eZWO 2-Year Limited Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ZWO","offers":[{"title":"Default Title","offer_id":44967437992221,"sku":"ZWO-EFW-EOS-II","price":69.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/ZWO-EOS-Lens-Adapter-for-EFW-1__74924.1596910055.1280.1280.jpg?v=1684341937"},{"product_id":"zwo-eos-lens-adapter-for-2-efw","title":"ZWO EOS Lens Adapter for 2\" EFW","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConnects Canon EOS lenses to a ZWO 2\" Electronic Filter Wheel\u003c\/li\u003e\n\u003cli\u003eM54x0.75 male thread that threads directly into the 2\" EFW\u003c\/li\u003e\n\u003cli\u003eEnables filtered, wide-field astrophotography with DSLR lenses\u003c\/li\u003e\n\u003cli\u003eEngineered specifically for the larger 2\" ZWO EFW models\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eZWO EOS Lens Adapter for 2\" EFW\u003c\/h2\u003e\n\u003cp\u003eThe ZWO EOS Lens Adapter for 2\" EFW (ZWO EFW2-EOS) provides the essential link between your Canon EOS-mount lenses and a ZWO 2-inch Electronic Filter Wheel. It features a robust M54x0.75 male thread that threads directly into the larger 2\" filter wheel body, enabling you to capture wide-field celestial images through your choice of filters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eM54x0.75 Thread for 2\" Filter Wheels\u003c\/h3\u003e\n\u003cp\u003eThis adapter is built around the M54x0.75 thread standard used on ZWO's 2\" EFW. This larger-diameter connection is critical for minimizing vignetting when pairing full-frame camera lenses with ZWO cameras that have large sensors. The secure, threaded interface ensures your imaging train remains perfectly collinear and free of light leaks throughout an imaging session.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eInstallation and Compatibility with your 2\" EFW\u003c\/h3\u003e\n\u003cp\u003eProper installation requires a direct connection to the ZWO 2\" EFW. To achieve this, you must first remove the sensor tilt adapter plate that comes attached to your ZWO camera. This ensures the correct spacing and a flush fit between the filter wheel and the camera body.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRequired EFW:\u003c\/strong\u003e This adapter is exclusively compatible with the ZWO 2\" Electronic Filter Wheel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncompatible EFWs:\u003c\/strong\u003e It is not mechanically compatible with the smaller ZWO 1.25\", 31mm, or 36mm filter wheels, which use a different thread size.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eZWO EFW2-EOS vs. ZWO-EOS-T2 Adapter\u003c\/h3\u003e\n\u003cp\u003eZWO produces two primary EOS lens adapters for its filter wheels, and choosing the correct one is critical. The key difference is the rear connection thread, which dictates which filter wheel it can attach to.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eZWO EFW2-EOS (This Model):\u003c\/strong\u003e Features a large M54x0.75 thread designed for the 2\" EFW. This is the correct choice for larger sensors and 2\" filters to avoid clipping the light path.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eZWO-EOS-T2 Adapter:\u003c\/strong\u003e Uses a smaller M42x0.75 (T2) thread. This version is designed for the 1.25\", 31mm, and 36mm EFWs, which are typically paired with cameras that have smaller APS-C or Four Thirds sensors.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat do I need to connect my Canon EOS lens to a ZWO 2\" EFW?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou need this specific adapter, the ZWO EOS Lens Adapter for 2\" EFW (SKU: ZWO-EFW2-EOS). It has the correct M54x0.75 thread to attach directly to the 2\" filter wheel.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this ZWO EOS adapter work with my ZWO 36mm EFW?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. This adapter is exclusively for the ZWO 2\" EFW. The ZWO 36mm, 31mm, and 1.25\" filter wheels require the ZWO-EOS-T2 adapter, which uses a smaller M42 thread.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need to modify my ZWO camera to install the EFW2-EOS adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, a minor adjustment is required. You must remove the sensor tilt adapter that comes pre-installed on the front of your ZWO cooled camera. This allows the camera to connect flush with the back of the 2\" EFW.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this adapter to image the Orion Nebula (M42) with my ZWO ASI2600MC Pro camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. This adapter is the ideal component for that setup. It allows you to connect a wide-angle Canon EOS lens to your 2\" EFW, which would house your filters (like a dual-band filter), and then thread directly to your ASI2600MC Pro (after removing its tilt plate). This creates a powerful wide-field imaging rig perfect for large targets like the Orion Nebula (M42).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy does this adapter use an M54x0.75 thread instead of a standard T2 thread?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe larger M54x0.75 thread is necessary to match the opening of the 2\" EFW. A smaller T2 (M42x0.75) thread would create a bottleneck in the light path, causing significant vignetting (darkened corners) on cameras with large sensors, especially when using full-frame EOS lenses.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the warranty on the ZWO EFW2-EOS adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis ZWO adapter is covered by a 2-year manufacturer warranty, ensuring it is free from defects in materials and workmanship.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSKU Number\u003c\/td\u003e\n\u003ctd\u003eZWO-EFW2-EOS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Wheel Product Type\u003c\/td\u003e\n\u003ctd\u003eFilter Wheel Adapter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003eZWO - 2 Years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eEOS Lens Adapter for 2\" EFW\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.zwoastro.com\/software\/\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e \n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/zwo-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eZWO 2-Year Limited Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ZWO","offers":[{"title":"Default Title","offer_id":44967453524253,"sku":"ZWO-EFW2-EOS","price":83.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/ZWO-EOS-Lens-Adapter-2-EFW-1__58784.1597107773.1280.1280.jpg?v=1684342348"},{"product_id":"zwo-nikon-lens-adapter-for-efw","title":"ZWO Nikon Lens Adapter for EFW","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConnects Nikon F-mount lenses to ZWO Electronic Filter Wheels\u003c\/li\u003e\n\u003cli\u003eEngineered for cameras with 6.5mm back focus\u003c\/li\u003e\n\u003cli\u003eProvides 20 mm of spacing\u003c\/li\u003e\n\u003cli\u003eStandard M42x0.75 female thread for EFW attachment\u003c\/li\u003e\n\u003cli\u003eCompatible with 1.25\", 31mm, and 36mm ZWO EFW models\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eZWO Nikon Lens Adapter for EFW\u003c\/h2\u003e\n\u003cp\u003eThe ZWO EFW-Nikon Adapter connects your Nikon lenses to select ZWO filter wheels, creating a 20 mm thick, rigid connection for wide-field imaging. It is engineered specifically for ZWO cooled cameras with a 6.5 mm back focus requirement, such as the ASI1600, ASI533, ASI183, and ASI294. The adapter features a standard M42x0.75 thread for direct attachment to ZWO's 1.25\", 31mm, and 36mm electronic filter wheels.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eWide-Field Imaging with 1.25\", 31mm, and 36mm Filters\u003c\/h3\u003e\n\u003cp\u003eThis adapter unlocks the optical power of your Nikon F-mount camera lenses for serious astrophotography. By integrating a ZWO 1.25\", 31mm, or 36mm Electronic Filter Wheel (EFW), you can capture narrowband or LRGB data on sprawling targets like the North America Nebula (NGC 7000) or the Andromeda Galaxy (M31) using the same glass you trust for terrestrial photography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003ePrecision Machined for a 6.5mm Back Focus\u003c\/h3\u003e\n\u003cp\u003eThe adapter's 20 mm thickness is precisely calculated to achieve correct spacing when paired with a ZWO EFW and a cooled camera that has a 6.5 mm back focus. This is a critical specification; cameras with a different back focus (such as 17.5mm) will not reach focus with this adapter. The all-metal, black-anodized construction ensures a secure, non-flexing connection between your lens and imaging train.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Cameras:\u003c\/strong\u003e Designed for ZWO models like the ASI1600, ASI183, ASI294, and ASI533, which all feature a 6.5mm back focus distance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSecure Connection:\u003c\/strong\u003e The M42x0.75 female thread provides a direct, stable attachment to the filter wheel, preventing tilt and maintaining optical alignment.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhich cameras are compatible with the ZWO EFW-Nikon adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis adapter is designed exclusively for ZWO cooled cameras that have a \u003cstrong\u003e6.5mm back focus\u003c\/strong\u003e. This includes popular models such as the ASI1600 Pro, ASI183 Pro, ASI294 Pro, and ASI533 Pro. It is not compatible with cameras requiring 17.5mm of back focus.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhich ZWO filter wheels work with this Nikon lens adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe ZWO EFW-Nikon adapter connects via an M42x0.75 thread to ZWO's electronic filter wheels that accept \u003cstrong\u003e1.25\", 31mm, and 36mm filters\u003c\/strong\u003e. It is not designed for larger 2\" filter wheels.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is the 6.5mm back focus requirement so important for the ZWO EFW-Nikon adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eCamera lenses, unlike telescopes, have a fixed and much shorter back focus distance. This adapter's 20 mm thickness is precisely machined to place the camera sensor at the exact focal plane of the Nikon lens when used with a ZWO EFW and a camera with 6.5mm of back focus. Using a camera with a different back focus will result in an inability to achieve a sharp image.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the ZWO EFW-Nikon adapter without a filter wheel?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this adapter is specifically designed to connect a Nikon lens to a ZWO Electronic Filter Wheel (EFW). It does not provide a direct camera-to-lens connection and relies on the filter wheel body for both threading and correct spacing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I use this Nikon adapter to image the Andromeda Galaxy (M31) with my ASI1600?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor a large target like the Andromeda Galaxy (M31), you could use a 200mm Nikon lens. Attach the lens to the ZWO EFW-Nikon adapter, connect the adapter to your ZWO EFW loaded with LRGB filters, and then thread the EFW onto your ASI1600. This setup gives you a wide field of view perfectly framed for M31, while allowing you to capture full-color data with your monochrome camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the advantage of using a Nikon lens with the ZWO adapter for the Rho Ophiuchi cloud complex?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Rho Ophiuchi cloud complex is an enormous region of the sky that requires a very wide field of view. Using a fast, wide-angle Nikon lens (e.g., 50mm f\/1.8) with the ZWO EFW-Nikon adapter allows you to capture the entire complex in a single frame. This is a field of view that is difficult or impossible to achieve with most telescopes, making this adapter an essential tool for ultra-wide-field astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eZWO-EFW-NIKON-II\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eFilter Wheel Adapter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Mount\u003c\/td\u003e\n\u003ctd\u003eNikon F-mount\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera-Side Thread\u003c\/td\u003e\n\u003ctd\u003eM42x0.75 Female\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRequired Camera Back Focus\u003c\/td\u003e\n\u003ctd\u003e6.5 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Thickness\u003c\/td\u003e\n\u003ctd\u003e20 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible ZWO EFW\u003c\/td\u003e\n\u003ctd\u003e1.25\", 31mm, 36mm models\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e2 Years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eZWO EFW-Nikon II Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSpacers\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 4\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.zwoastro.com\/software\/\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e \n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/zwo-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eZWO 2-Year Limited Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ZWO","offers":[{"title":"Default Title","offer_id":44967453720861,"sku":"ZWO-EFW-Nikon-II","price":83.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/ZWO-Nikon-Lens-Adapter-EFW-1__40075.1597108031.1280.1280.jpg?v=1684342354"},{"product_id":"zwo-efw-7-x-50mm-square-filter-wheel","title":"ZWO EFW - 7 x 50mm Square Filter Wheel","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eHolds seven 50mm square unmounted filters\u003c\/li\u003e\n\u003cli\u003eDesigned for large-format sensors like the ZWO ASI461MM Pro\u003c\/li\u003e\n\u003cli\u003eDirect bolt-on connection for maximum rigidity\u003c\/li\u003e\n\u003cli\u003ePowered and controlled via a single USB 2.0 cable\u003c\/li\u003e\n\u003cli\u003eASCOM and ASIAIR compatible\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eZWO 7 Position Electronic Filter Wheel for 50mm Square Filters\u003c\/h2\u003e\n\u003cp\u003eThe ZWO EFW-7X50 holds 7 different 50mm square filters for automated imaging, a format required to prevent vignetting on large medium-format sensors. Its design uses 12 M2.5x6 screws for direct attachment and draws power from a 2m USB 2.0 cable, creating a rigid and reliable imaging train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e7 Positions for 50mm Square Filters\u003c\/h3\u003e\n\u003cp\u003eThis wheel's 7-filter capacity lets you load an entire LRGB and narrowband (SHO) filter set at once, enabling fully automated imaging sequences without manual changes. The 50mm square format is specifically chosen to ensure the light cone fully illuminates large sensors, such as the medium-format chip in the ASI461MM Pro, from corner to corner.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eDirect-Bolt Integration Using 12 M2.5x6 Screws\u003c\/h3\u003e\n\u003cp\u003eUnlike universal filter wheels that rely on threaded connections, the ZWO EFW-7X50 bolts directly to the ZWO ASI461MM Pro camera body and M68 OAG. This connection, secured by the included 12 M2.5x6 screws, forms a single, rigid unit that eliminates the potential for tilt or flexure common in heavy, threaded imaging trains. This design choice prioritizes stability over universal compatibility.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eReliable Filter Changes via USB 2.0\u003c\/h3\u003e\n\u003cp\u003eA high-quality NPM stepper motor ensures precise, repeatable filter positioning with bidirectional movement for the shortest path. The entire unit is powered and controlled through a single USB 2.0 connection, minimizing cable clutter. ZWO includes both a 2m and a 0.5m cable to accommodate different setups, and the wheel is fully supported by ASIAIR and ASCOM platforms for seamless integration with your acquisition software.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eEliminating Vignetting: 50mm Square vs. M48 Threaded Filters\u003c\/h3\u003e\n\u003cp\u003eFor imagers using medium-format sensors, standard 2-inch filters with M48 threads become the bottleneck in the optical path. Their sub-48mm clear aperture physically blocks light from reaching the corners of a large sensor, causing significant vignetting and data loss. The ZWO EFW-7X50 solves this by using unmounted 50mm square filters, which offer a clear aperture wide enough to deliver an evenly illuminated field across the entire sensor, preserving both signal and star shape to the edge of the frame.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy do I need the ZWO EFW-7X50 for a camera like the ASI461MM Pro?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA medium-format sensor like the one in the ASI461MM Pro is physically larger than the clear aperture of a standard 2-inch threaded filter. Using smaller filters will cause vignetting, where the corners of your images are dark. The \u003cstrong\u003eZWO EFW-7X50\u003c\/strong\u003e uses \u003cstrong\u003e50mm square filters\u003c\/strong\u003e to ensure the entire sensor is illuminated, preventing data loss.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use standard 2-inch round threaded filters in the ZWO EFW-7X50?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. This filter wheel is specifically designed for \u003cstrong\u003e50mm x 50mm unmounted square filters\u003c\/strong\u003e. It does not have the M48 threads required to accept standard 2-inch mounted filters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the ZWO EFW-7X50 require a separate 12V power supply?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, it does not. The filter wheel is powered and controlled entirely through its \u003cstrong\u003eUSB 2.0 port\u003c\/strong\u003e, using the included USB cable. This simplifies cable management at the telescope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I control the ZWO EFW-7X50 filter wheel?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou can control the ZWO EFW-7X50 using a \u003cstrong\u003eZWO ASIAIR\u003c\/strong\u003e device or through a computer running any \u003cstrong\u003eASCOM-compatible\u003c\/strong\u003e astrophotography software, such as N.I.N.A. or Sequence Generator Pro.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIf I'm imaging the Andromeda Galaxy (M31) with the ASI461MM, will this filter wheel illuminate the entire sensor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The 50mm square filter format of the ZWO EFW-7X50 is designed for exactly this scenario. It provides an unvignetted field of view for large targets like the Andromeda Galaxy (M31) on large sensors, ensuring even illumination from one edge of the galaxy to the other.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat's the process for an automated LRGB sequence on the Cygnus Loop (NGC 6960) with the ZWO EFW-7X50?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWith the ZWO EFW-7X50 loaded with L, R, G, and B filters, you can use software like the ASIAIR or ASCOM-based programs to create an automated plan. You would define the number and length of exposures for each filter, and the software will command the wheel to switch to the correct filter automatically between sets, allowing you to capture all the data for the Cygnus Loop (NGC 6960) in a single unattended session.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eZWO-EFW-7X50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Positions\u003c\/td\u003e\n\u003ctd\u003e7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupported Filter Size\u003c\/td\u003e\n\u003ctd\u003e50mm Square\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Type\u003c\/td\u003e\n\u003ctd\u003eDrop-In (Unmounted)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Source\u003c\/td\u003e\n\u003ctd\u003eUSB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eElectronic Filter Wheel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e2 Years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e7x50mm Electronic Filter Wheel Body\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e2m USB 2.0 Right-Angle Cable\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e0.5m USB 2.0 Right-Angle Cable\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e2.0x75 mm Phillips Screwdriver\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e50x50mm Filter Masks\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 10\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDarkening Rings Set\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eM2x4 Screws\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 26\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eM2.5x6 Screws\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 12\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.zwoastro.com\/software\/\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/zwo-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eZWO 2-Year Limited Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ZWO","offers":[{"title":"Default Title","offer_id":47152411148573,"sku":"ZWO EFW-7x50","price":849.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/ZWO-EFW-7x50.jpg?v=1700254303"},{"product_id":"zwo-electronic-filter-wheel-efw-gen2-7-x-2","title":"ZWO Electronic Filter Wheel EFW Gen2 - 7 x 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eHolds seven 2\" mounted or 50mm unmounted filters\u003c\/li\u003e\n\u003cli\u003eAdds 20 mm of back focus to the imaging train\u003c\/li\u003e\n\u003cli\u003eStepper motor for precise, quiet filter selection\u003c\/li\u003e\n\u003cli\u003eSingle USB-C cable for power and data\u003c\/li\u003e\n\u003cli\u003eDirectly compatible with ZWO full-frame and APS-C cameras\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eZWO 7 Position Electronic Filter Wheel for 2\" Filters (2025)\u003c\/h2\u003e\n\u003cp\u003eThe ZWO Electronic Filter Wheel EFW Gen2 holds up to 7 different 2\" filters, adding only 20 mm of back focus to your imaging train. This capacity allows you to load entire LRGB and SHO filter sets simultaneously, selecting between any of the 7 positions via a single USB connection for fully automated imaging sequences.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e7-Position Carousel for 2\" Filters\u003c\/h3\u003e\n\u003cp\u003eThe primary function of the EFW Gen2 is its 7-position capacity, which eliminates the need to swap filters manually between imaging sessions. You can install a complete LRGB color set (Luminance, Red, Green, Blue) and a narrowband SHO set (Sulfur-II, Hydrogen-alpha, Oxygen-III) at the same time, with one slot to spare. This is ideal for monochrome imagers who operate remotely or want to capture different data types on the same target in one night without reconfiguring their optical train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eEngineered for a 20 mm Back Focus Path\u003c\/h3\u003e\n\u003cp\u003eThis filter wheel consumes exactly 20 mm of back focus, a critical measurement for planning a correct and rigid imaging train. The body is designed for direct, secure attachment to ZWO APS-C and full-frame cameras, creating a zero-flexure connection. The M54 threads on both the telescope and camera side maintain a wide, unvignetted light path suitable for large sensors, while the included M54-to-M48 and M54-to-M42 adapters ensure compatibility with a wide range of correctors and accessories.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eZWO EFW Gen2 7 x 2\" vs. 5 x 2\"\u003c\/h3\u003e\n\u003cp\u003eThe main advantage of the 7-position EFW over its 5-position sibling is capacity. While both models share the same 20 mm back focus consumption and robust stepper motor design, the choice depends entirely on your imaging workflow.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eZWO EFW 7 x 2\":\u003c\/strong\u003e Choose this model if you frequently switch between broadband (LRGB) and narrowband (SHO) imaging. The 7 slots let you keep both sets installed, making it perfect for automated, multi-night projects on galaxies that have H-alpha regions, like Andromeda (M31) or Triangulum (M33).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eZWO EFW 5 x 2\":\u003c\/strong\u003e A more compact and lighter option, the 5-position wheel is sufficient if you primarily stick to one filter set per session, such as LRGB for galaxies or a dedicated narrowband palette for nebulae. It's a better fit for portable setups where weight and balance are primary concerns.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eUSB-Powered Stepper Motor Control\u003c\/h3\u003e\n\u003cp\u003eA high-precision stepper motor drives the filter carousel, ensuring positional accuracy and quiet operation. The wheel is powered and controlled through a single USB-C cable connected to your camera's USB hub or directly to your control computer. It is fully supported by the ASIAIR ecosystem and has ASCOM drivers for use with third-party software like NINA or Sequence Generator Pro, enabling seamless integration into automated imaging plans.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat types of filters can I install in the ZWO EFW 7 x 2\"?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe ZWO EFW 7 x 2\" accepts standard \u003cstrong\u003e2\" mounted filters\u003c\/strong\u003e with M48x0.75 threads. It can also hold \u003cstrong\u003eunmounted 50 mm filters\u003c\/strong\u003e. This versatility covers the vast majority of astronomical filters from all major manufacturers, making it suitable for full-frame sensors without vignetting.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I install both LRGB and SHO 2\" filter sets in the ZWO EFW 7 x 2\" at the same time?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. An LRGB filter set requires 4 slots, and an SHO narrowband set requires 3 slots. The 7-position carousel of the ZWO EFW 7 x 2\" allows you to install both complete sets simultaneously, which is one of its primary advantages for advanced monochrome imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 20 mm back focus of the ZWO EFW 7 x 2\" affect my imaging train?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 20 mm back focus consumption is a fixed distance you must account for in your optical train calculation. For a typical setup requiring 55 mm of back focus, if your ZWO camera has 17.5 mm of native back focus, the EFW (20 mm) and any required adapters must total the remaining 37.5 mm. The included adapters are designed to help achieve this standard spacing with ZWO cameras.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the ZWO EFW 7 x 2\" compatible with non-ZWO cameras?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. While it's designed for direct connection to ZWO cameras, the filter wheel uses standard M54x0.75 threads on its telescope-facing side and includes M54M-to-M48F and M54M-to-M42F adapters. This allows you to connect it to a wide variety of cameras and optical systems that use these common T-thread standards.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the ZWO EFW 7 x 2\" require a separate power cable?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The ZWO EFW 7 x 2\" is powered directly via its USB connection. You can plug it into the integrated USB hub on a cooled ZWO camera or directly into your ASIAIR or control computer. This simplifies cable management at the telescope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I control the ZWO EFW 7 x 2\" for imaging the Orion Nebula (M42)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou can control the filter wheel using software like the ZWO ASIAIR, NINA, or Sequence Generator Pro. For a target like the Orion Nebula (M42), you would create an imaging plan that automatically rotates to your H-alpha filter for capturing the core nebulosity, then to your LRGB filters to gather broadband data for the surrounding stars and dust, all without manual intervention.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eZWO-EFW-7X2-25\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eElectronic Filter Wheel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Size\u003c\/td\u003e\n\u003ctd\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Positions\u003c\/td\u003e\n\u003ctd\u003e7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus Consumption\u003c\/td\u003e\n\u003ctd\u003e20 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Source\u003c\/td\u003e\n\u003ctd\u003eUSB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Mounting\u003c\/td\u003e\n\u003ctd\u003eThreaded or Drop-In\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e2 Years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e7 Position Electronic Filter Wheel for 2\" Filters (2025)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eM54M to M48F 2 mm Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eM54M to M42F Adapter Ring\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eM54M to M48F Adapter Ring\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eM2.5x6 Screws\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 6\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eM2x4 Screws\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 26\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eFilter Masks\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 10\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e2 M USB-C Cable\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e0.5 M USB-C Cable\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003ePhillips Head Screwdriver\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.zwoastro.com\/software\/\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/zwo-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eZWO 2-Year Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ZWO","offers":[{"title":"Default Title","offer_id":50705747509533,"sku":"ZWO-EFW-7x2-25","price":559.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/ZWO-EFW-7x2-25.png?v=1765339680"},{"product_id":"zwo-electronic-filter-wheel-efw-gen2-5-x-2","title":"ZWO Electronic Filter Wheel EFW Gen2 - 5 x 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eHolds 5 x 2\" mounted or 50mm unmounted filters\u003c\/li\u003e\n\u003cli\u003eAdds only 20 mm of back focus to the imaging train\u003c\/li\u003e\n\u003cli\u003eStepper motor for precise, repeatable filter selection\u003c\/li\u003e\n\u003cli\u003eSingle USB-C cable for power and data\u003c\/li\u003e\n\u003cli\u003eASCOM and ASIAIR compatible\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eZWO 5 Position Electronic Filter Wheel for 2\" Filters (2025)\u003c\/h2\u003e\n\u003cp\u003eThe ZWO 5 Position Electronic Filter Wheel automates your imaging sequence by housing up to 5 different 2\" filters in a single, rigid unit. This second-generation wheel adds only 20 mm of back focus to your optical train, making it compatible with a wide range of imaging setups while being fully powered over USB.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eAutomated Access to 5 Full-Size 2\" Filters\u003c\/h3\u003e\n\u003cp\u003eThis wheel's 5-position carousel is ideal for a complete LRGB+Ha or SHO+L set, eliminating the need to manually swap filters in the dark. A high-precision stepper motor rotates the carousel, ensuring the selected filter aligns perfectly with the sensor every time. The system is fully compatible with automation software like NINA or Sequence Generator Pro via its ASCOM driver, as well as native integration with the ZWO ASIAIR.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA Minimal 20 mm of Back Focus Consumption\u003c\/h3\u003e\n\u003cp\u003eBy consuming just 20 mm of back focus, the EFW-5x2 leaves critical space in your imaging train for other accessories like off-axis guiders or adaptive optics. This slim profile is achieved through a design that allows direct, secure mounting to ZWO's full-frame and APS-C cameras. For other configurations, the included M54-to-M48 and M54-to-M42 adapters provide flexible connection options to achieve standard 55mm back focus spacing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eZWO EFW 5x2\" vs. 7x2\": Choosing Your Capacity\u003c\/h3\u003e\n\u003cp\u003eThe primary advantage of ZWO's 7x2\" EFW is capacity, holding two extra filters for complex palettes (e.g., LRGB + Ha, SII, OIII). This is ideal if you need your entire filter collection online at once. However, the 5x2\" EFW is significantly more compact and weighs less, making it a better choice for smaller mounts or portable setups where every gram counts. For most imagers using standard LRGB or narrowband sets, the 5 positions are ample, and the reduced system weight is a clear advantage.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eRobust Gen2 Design with USB-C Control\u003c\/h3\u003e\n\u003cp\u003eThis second-generation EFW features an improved housing with enhanced light-blocking seals to prevent stray light from contaminating your exposures. The entire unit is controlled and powered through a single, reliable USB-C connection to your control PC or ASIAIR unit. This simplifies cable management and reduces potential snag points at the telescope, leading to more reliable, automated imaging sessions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat types of filters can I use with the ZWO 5x2\" EFW?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe filter wheel accepts standard \u003cstrong\u003e2\" mounted filters\u003c\/strong\u003e with M48x0.75 threads. It can also hold unmounted \u003cstrong\u003e50mm filters\u003c\/strong\u003e. The design accommodates most common filter cell heights and thicknesses, making it compatible with a wide range of brands.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I connect the ZWO 5x2\" EFW to my ZWO camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor many ZWO cooled cameras, the filter wheel can be bolted directly to the camera body for the most rigid, secure connection. The package also includes M54-to-M48 and M54-to-M42 adapters to facilitate threaded connections and achieve the correct 55mm back focus with various camera spacers and accessories.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the ZWO 5x2\" EFW require a separate 12V power supply?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, it does not. The filter wheel is powered entirely through its \u003cstrong\u003eUSB connection\u003c\/strong\u003e. This simplifies your cabling setup, as it draws all necessary power for the motor and electronics from the same cable used for data communication.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat software is compatible with the ZWO 5x2\" EFW?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe ZWO 5x2\" EFW is compatible with a broad range of astrophotography software. It works natively within the \u003cstrong\u003eZWO ASIAIR\u003c\/strong\u003e ecosystem for plug-and-play operation. For Windows-based control, it is fully supported by an \u003cstrong\u003eASCOM driver\u003c\/strong\u003e, allowing it to be used with popular applications like NINA, Sequence Generator Pro (SGP), and Maxim DL.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the ZWO 5x2\" EFW for imaging the Orion Nebula (M42) with a color camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. While often used for monochrome imaging, a filter wheel is a powerful tool for one-shot-color cameras too. For M42, you could load the 5 positions with:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eUV\/IR Cut Filter:\u003c\/strong\u003e For standard broadband imaging.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual-Band Filter (Ha\/OIII):\u003c\/strong\u003e To isolate nebula gases and fight light pollution.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUHC\/LPR Filter:\u003c\/strong\u003e For general light pollution reduction.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eL-eXtreme\/L-eNhance Filter:\u003c\/strong\u003e For more aggressive narrowband capture with your color camera.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThis allows you to switch between different filtering strategies to capture both the bright core and faint outer structures of the nebula without altering your imaging train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI have an 8\" SCT with a 0.63x reducer. Is the 20mm back focus of the ZWO 5x2\" EFW an issue?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, the 20mm back focus is perfectly manageable. Most focal reducers for SCTs require a specific back focus distance, typically 105mm from the reducer's rear thread. The 20mm consumed by the filter wheel fits easily within this budget, leaving 85mm for your off-axis guider and camera spacers, which is a very common configuration.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eZWO-EFW-5X2-25\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eElectronic Filter Wheel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Capacity\u003c\/td\u003e\n\u003ctd\u003e5 Positions\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAccepted Filter Size\u003c\/td\u003e\n\u003ctd\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Mounting\u003c\/td\u003e\n\u003ctd\u003eAccepts Both Threaded \u0026amp; Drop-In\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus Consumption\u003c\/td\u003e\n\u003ctd\u003e20 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Source\u003c\/td\u003e\n\u003ctd\u003eUSB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e5x2\" Electronic Filter Wheel Body\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e2m USB-C Cable\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e0.5m USB-C Cable\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eM54M to M48F Adapter (2mm)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eM54M to M48F Adapter Ring\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eM54M to M42F Adapter Ring\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eM2.5x6 Screws\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 6\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eM2x4 Screws\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 26\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eFilter Masks for Unmounted Filters\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 10\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003ePhillips Head Screwdriver\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.zwoastro.com\/software\/\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/zwo-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eZWO 2-Year Limited Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ZWO","offers":[{"title":"Default Title","offer_id":50706845630749,"sku":"ZWO-EFW-5x2-25","price":419.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/ZWO-EFW-5x2-25.png?v=1765338722"},{"product_id":"zwo-electronic-filter-wheel-efw-gen2-8-x-1-25","title":"ZWO Electronic Filter Wheel EFW Gen2 - 8 x 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eHolds 8 x 1.25\" mounted or 31mm unmounted filters\u003c\/li\u003e\n\u003cli\u003eAdds 20 mm of back focus to the imaging train\u003c\/li\u003e\n\u003cli\u003eUSB-powered stepper motor for precise filter selection\u003c\/li\u003e\n\u003cli\u003eRedesigned housing for improved light leak prevention\u003c\/li\u003e\n\u003cli\u003eASCOM and ASIAIR compatible for full automation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eZWO EFW 8-Position Filter Wheel for 1.25\" and 31 mm Filters (2025)\u003c\/h2\u003e\n\u003cp\u003eThe ZWO EFW Gen2 automates your imaging sequence with an 8-position carousel designed for both 1.25\" and 31mm filters. This USB-powered wheel consumes a minimal 20 mm of back focus, making it a straightforward addition to most optical trains while enabling full LRGB and narrowband filter sets to be loaded simultaneously.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eAutomate 8 Filters for LRGB and SHO Sequences\u003c\/h3\u003e\n\u003cp\u003eThe 8-position carousel is the core of this wheel's efficiency, allowing you to load a complete LRGB filter set (Luminance, Red, Green, Blue) and a full SHO narrowband set (Sulfur-II, Hydrogen-alpha, Oxygen-III) with a position to spare for a UV\/IR cut or dark filter. This capacity eliminates the need to swap filters between imaging sessions, enabling fully automated, multi-night projects controlled via ASIAIR or ASCOM-compliant software.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA Consistent 20 mm Back Focus Path\u003c\/h3\u003e\n\u003cp\u003eZWO engineered this filter wheel to consume exactly 20 mm of back focus. This fixed optical path length simplifies the process of integrating it with reducers and flatteners that have strict spacing requirements. By maintaining a known, slim profile, you can calculate your adapter and spacer needs without the complexity introduced by bulkier filter solutions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eDual 1.25\" and 31mm Filter Support\u003c\/h3\u003e\n\u003cp\u003eThe wheel is designed to accept both industry-standard 1.25\" mounted filters and 31mm unmounted filters. This flexibility ensures compatibility with a vast range of filters from nearly every manufacturer, protecting your investment in glass. Whether you use threaded filters for convenience or unmounted filters to maximize the clear aperture for a specific sensor, the EFW Gen2 accommodates both formats securely.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eZWO EFW Gen2 vs. First Generation\u003c\/h3\u003e\n\u003cp\u003eThis second-generation model introduces key structural improvements over its predecessor. The most significant is a redesigned housing that provides superior light leak protection, critical for long-exposure narrowband imaging. The internal stepper motor is also refined for quieter, more reliable operation, ensuring precise filter alignment every time without disturbing the telescope's balance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow many filters can the ZWO EFW Gen2 8-position wheel hold?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe ZWO EFW Gen2 8-position filter wheel is designed to hold up to \u003cstrong\u003e8 individual filters\u003c\/strong\u003e. It is compatible with both standard 1.25\" mounted filters and 31mm unmounted filters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the back focus of the ZWO EFW 8 x 1.25\" filter wheel?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe filter wheel adds exactly \u003cstrong\u003e20 mm\u003c\/strong\u003e of back focus to your imaging train. This measurement is crucial for correctly spacing your camera sensor from any field flattener or focal reducer.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the ZWO EFW 8-position wheel for an LRGB + SHO filter set with my ASI1600MM Pro?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, absolutely. The 8-filter capacity is ideal for this exact scenario. You can load a full LRGB set (4 filters) and a full SHO narrowband set (3 filters), leaving one slot free for a dark filter, a UV\/IR Cut filter, or another specialized filter. This allows you to run fully automated sequences for both broadband and narrowband targets like the Orion Nebula (M42) without ever opening the imaging train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I power the ZWO EFW Gen2 filter wheel when connected to my imaging PC?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe ZWO EFW Gen2 is powered directly via its \u003cstrong\u003eUSB\u003c\/strong\u003e connection. No separate 12V power supply is required. You can connect it to your ZWO cooled camera's integrated USB hub or directly to your ASIAIR, laptop, or control PC.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the ZWO EFW Gen2 support both 1.25\" mounted and 31mm unmounted filters?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the wheel is designed to accept both formats. Mounted 1.25\" filters thread directly into the carousel, while 31mm unmounted filters are held in place by the included filter masks and screws, giving you flexibility in your filter choices.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat improvements does the ZWO EFW Gen2 have over the previous version?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary improvements in the Gen2 model are a redesigned body for enhanced light leak prevention and an upgraded stepper motor for quieter and more precise operation. These changes make it more robust for demanding long-exposure astrophotography where stray light and mechanical reliability are critical.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eZWO-EFW-8X125-25\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eElectronic Filter Wheel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Capacity\u003c\/td\u003e\n\u003ctd\u003e8 Positions\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupported Filter Sizes\u003c\/td\u003e\n\u003ctd\u003e1.25\" or 31mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Mounting\u003c\/td\u003e\n\u003ctd\u003eAccepts Both Threaded \u0026amp; Drop-In\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus Consumption\u003c\/td\u003e\n\u003ctd\u003e20 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Source\u003c\/td\u003e\n\u003ctd\u003eUSB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003eZWO - 2 Years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e8-Position Filter Wheel Body\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eM42M to M42M Adapter (T2 to T2)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e1.25\" Nosepiece\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e1.25\" Camera Connection\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eM2.5x6 Screws\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 6\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eM2x4 Screws\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 26\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eM4x12 Screws\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 2\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eFilter Masks\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 10\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e2 M USB-C Cable\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e0.5 M USB-C Cable\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003ePhillips Head Screwdriver\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e1.25\" Cover \u0026amp; Cap\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.zwoastro.com\/software\/\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e \n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/zwo-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eZWO 2-Year Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ZWO","offers":[{"title":"Default Title","offer_id":50706886164765,"sku":"ZWO-EFW-8x1.25-25","price":419.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/ZWO-EFW-8x1-25-25.png?v=1765339633"},{"product_id":"zwo-electronic-filter-wheel-efw-gen2-5-x-1-25","title":"ZWO Electronic Filter Wheel EFW Gen2 - 5 x 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e5 filter positions for 1.25\" or 31mm filters\u003c\/li\u003e\n\u003cli\u003eAdds 20 mm of back focus to the imaging train\u003c\/li\u003e\n\u003cli\u003eUSB-C powered and controlled\u003c\/li\u003e\n\u003cli\u003eRedesigned housing for improved light leak prevention\u003c\/li\u003e\n\u003cli\u003eCompatible with ASIAIR and ASCOM drivers\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eZWO EFW 5-Position Filter Wheel for 1.25\" and 31 mm Filters (2025)\u003c\/h2\u003e\n\u003cp\u003eThe ZWO EFW 5-Position Filter Wheel automates your imaging sequences by holding a full LRGB or narrowband filter set, accepting both 1.25\" and 31mm formats across its 5 positions. This second-generation wheel is powered entirely via USB and consumes only 20 mm of back focus, making it a compact addition to nearly any imaging train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eAutomated Imaging with 5 Filter Positions\u003c\/h3\u003e\n\u003cp\u003eThis wheel holds up to 5 different filters, allowing you to load a complete LRGB (Luminance, Red, Green, Blue) or SHO (Sulphur-II, Hydrogen-alpha, Oxygen-III) set for monochrome imaging. The internal stepper motor rotates the carousel with high precision, ensuring each filter centers perfectly in the light path every time. Once installed, you can control filter changes remotely via ASIAIR or ASCOM, eliminating the need to manually disturb the telescope for filter swaps during an imaging session.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e20mm Back Focus with Redesigned Housing\u003c\/h3\u003e\n\u003cp\u003eThe Gen2 design adds exactly 20 mm to your optical train, a critical measurement for planning correct spacing with reducers and flatteners. ZWO has redesigned the housing with an improved slot-style closure and a sealed motor compartment to eliminate stray light that could otherwise compromise long exposures. The move to a modern USB-C port provides a more reliable connection for both power and data and is easier to plug in while working in the dark.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eFlexible Integration with M42 and 1.25\" Adapters\u003c\/h3\u003e\n\u003cp\u003eThe filter wheel is designed for maximum compatibility with common astronomy equipment. It features female M42x0.75 (T2) threads on both the telescope and camera sides for a secure, threaded connection. For added flexibility, the package includes a 1.25\" nosepiece to connect to a standard focuser and a 1.25\" eyepiece holder for the camera side, allowing you to build your imaging train using multiple connection standards.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat types of filters fit in the ZWO EFW 5-Position Filter Wheel?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis filter wheel accepts two standard sizes. You can install up to 5 standard \u003cstrong\u003e1.25\" mounted filters\u003c\/strong\u003e with male threads, or up to 5 \u003cstrong\u003e31mm unmounted filters\u003c\/strong\u003e. This covers the most common filter formats for small-to-medium format astronomy cameras.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow much back focus does the ZWO EFW Gen2 add to an imaging train?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe filter wheel body itself consumes precisely \u003cstrong\u003e20 mm of back focus\u003c\/strong\u003e. This is the distance from the front flange to the rear flange of the main housing. You must account for this distance when calculating the spacing for your field flattener or reducer.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the ZWO EFW 5-Position Filter Wheel compatible with the ASIAIR Plus?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The ZWO EFW is fully compatible with all ASIAIR models. You can connect it via its USB-C port directly to the ASIAIR, where it will be automatically recognized. This allows you to select filters and build automated imaging plans directly within the ASIAIR app.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need an external power supply for the ZWO EFW Gen2?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The filter wheel is powered entirely through its \u003cstrong\u003eUSB\u003c\/strong\u003e connection. A single USB-C cable connected to your control computer, ASIAIR, or a powered USB hub provides both power and data for the unit, simplifying cable management at the telescope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this EFW for imaging the Orion Nebula (M42) with a monochrome camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. For a target like the Orion Nebula (M42), you could load the ZWO EFW with Luminance, Red, Green, and Blue filters for a full-color LRGB image. Alternatively, for a narrowband image from light-polluted skies, you could load H-alpha, O-III, and S-II filters to capture the distinct ionized gases within the nebula.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the ZWO EFW 5-Position wheel cause vignetting with an APS-C sensor camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile designed for smaller sensors, 1.25\" and 31mm filters can often be used with APS-C sensors without significant vignetting, especially on slower telescopes (f\/7 or higher). On faster systems (f\/5 or lower), you may see some darkening in the corners of your images. For full-frame sensors or very fast optics, a larger filter wheel using 2\" or 36mm filters is recommended.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eZWO-EFW-5X125-25\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eElectronic Filter Wheel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Positions\u003c\/td\u003e\n\u003ctd\u003e5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupported Filter Sizes\u003c\/td\u003e\n\u003ctd\u003e1.25\" or 31mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus Consumption\u003c\/td\u003e\n\u003ctd\u003e20 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Source\u003c\/td\u003e\n\u003ctd\u003eUSB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting Style\u003c\/td\u003e\n\u003ctd\u003eAccepts Both Threaded or Drop-In\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e2 Years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eEFW 5-Position Filter Wheel (2025)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eM42M to M42M (T2) Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e1.25\" Nosepiece\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e1.25\" Connection Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eM2.5x6 Screws\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 6\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eM2x4 Screws\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 26\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eM4x12 Screws\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 2\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eFilter Masks\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 10\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e2 M USB-C Cable\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e0.5 M USB-C Cable\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003ePhillips Head Screwdriver\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e1.25\" Cover \u0026amp; Cap\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.zwoastro.com\/software\/\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/zwo-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eZWO 2-Year Limited Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ZWO","offers":[{"title":"Default Title","offer_id":50706899796253,"sku":"ZWO-EFW-5x1.25-25","price":279.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/ZWO-EFW-5x1-25-25.png?v=1765339028"},{"product_id":"zwo-electronic-filter-wheel-efw-gen2-7-x-36mm","title":"ZWO Electronic Filter Wheel EFW Gen2 - 7 x 36mm","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eHouses seven 36mm unmounted filters\u003c\/li\u003e\n\u003cli\u003eAdds a minimal 20mm of back focus to the imaging train\u003c\/li\u003e\n\u003cli\u003e7-position carousel for LRGB, narrowband, or custom sets\u003c\/li\u003e\n\u003cli\u003ePowered and controlled via a single USB-C cable\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eZWO EFW 7-Position Filter Wheel for 36mm Filters (2025)\u003c\/h2\u003e\n\u003cp\u003eThe ZWO EFW Gen2 automates your imaging sequence with a 7-position carousel designed specifically for 36mm unmounted filters. This wheel consumes only 20mm of back focus, making it a slim and efficient core component for APS-C sensor imaging trains. All power and control are handled through a single USB connection, simplifying cable management in the field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e7-Position Capacity for 36mm Filters\u003c\/h3\u003e\n\u003cp\u003eThe internal carousel holds up to seven 36mm unmounted filters, providing enough capacity to house a full LRGB set and a 3-filter narrowband SHO set simultaneously. This eliminates the need to swap filters between targets, allowing for fully automated, multi-palette imaging sessions. The 36mm filter size is the optimal choice for cameras with APS-C format sensors, providing full sensor illumination without the cost or vignetting risk of undersized filters, or the unnecessary expense of 2\" filters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eRedesigned Housing to Reduce Light Leaks\u003c\/h3\u003e\n\u003cp\u003eThis second-generation EFW features a redesigned body focused on reducing internal reflections and stray light. A re-engineered internal design helps reduce light leakage, and the included filter masks hold each unmounted filter securely in the carousel. These improvements ensure that long exposures, especially with narrowband filters, are protected from gradients and artifacts caused by stray light.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eUSB-Powered Simplicity with 2 Included Cables\u003c\/h3\u003e\n\u003cp\u003eThe filter wheel is powered and controlled entirely through its USB-C port, drawing minimal power and requiring no separate 12V supply. This simplifies cable routing and reduces potential failure points at the telescope. ZWO includes both a 0.5 M and a 2 M USB-C cable, giving you flexible options for connecting to an ASIAIR, a camera's USB hub, or a computer.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNative ASIAIR Control:\u003c\/strong\u003e Integrates seamlessly with the ZWO ASIAIR ecosystem for control via your smartphone or tablet.\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eASCOM Compliant:\u003c\/strong\u003e A standard ASCOM driver ensures compatibility with N.I.N.A., SGP, and other popular acquisition software on Windows.\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect Connection:\u003c\/strong\u003e Bolt-through holes allow for a rigid, direct attachment to ZWO cameras, creating a solid imaging train with minimal flexure.\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eZWO EFW Gen2 vs. First-Generation EFW\u003c\/h3\u003e\n\u003cp\u003eThis 2025 model introduces several key upgrades over the original ZWO EFW design. While both provide reliable filter changes, the Gen2 model is engineered for more demanding imaging applications.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStray Light Control:\u003c\/strong\u003e The Gen2's primary advantage is its superior light-leak protection, thanks to its re-engineered internal design. This is a critical improvement for imagers working under light-polluted skies or capturing faint signals.\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnectivity:\u003c\/strong\u003e The move from a legacy USB port to a modern USB-C port provides a more reliable and easier-to-use connection, especially in the dark.\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMechanical Precision:\u003c\/strong\u003e An upgraded stepper motor and internal mechanism deliver precise, repeatable filter placement, ensuring flats calibrate correctly every time.\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main advantage of the ZWO EFW Gen2 7x36mm over the previous version?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary advantage of the Gen2 model is its significantly improved \u003cstrong\u003estray light protection\u003c\/strong\u003e. Its re-engineered internal design helps reduce light leakage, which is critical for long-exposure narrowband imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use 1.25\" filters with the ZWO EFW 7x36mm filter wheel?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this filter wheel is specifically designed for \u003cstrong\u003e36mm unmounted filters\u003c\/strong\u003e. Using 1.25\" filters would require custom adapters and would likely cause significant vignetting on most sensors the wheel is designed for.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 20mm back focus of the ZWO EFW 7x36mm affect my imaging train with a ZWO ASI2600MM Pro?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 20mm back focus is a key measurement for achieving the standard 55mm distance from your flattener\/reducer. With an ASI2600MM Pro (which has 17.5mm of back focus), you would typically attach the EFW directly to the camera (20mm + 17.5mm = 37.5mm). You would then add 17.5mm of spacers between the filter wheel and your flattener to reach the 55mm target.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI want to image the Andromeda Galaxy (M31) in LRGB. Is the ZWO EFW 7x36mm a good choice?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it's an excellent choice. The 7-position capacity allows you to load Luminance, Red, Green, and Blue filters with three extra slots to spare. You can automate the entire capture sequence for M31 without having to manually change filters, and the 36mm size is ideal for the large sensors found in cameras well-suited for capturing our galactic neighbor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the ZWO EFW 7x36mm require an external 12V power supply?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, it does not. The ZWO EFW is powered entirely by the \u003cstrong\u003eUSB\u003c\/strong\u003e connection to your ASIAIR, camera USB hub, or computer. This simplifies your setup and reduces cable clutter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I connect the ZWO EFW 7x36mm to my telescope's 1.25\" focuser?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe filter wheel includes a \u003cstrong\u003e1.25\" nosepiece\u003c\/strong\u003e. You can thread this directly onto the T2 (M42) threads of the filter wheel's front plate, allowing you to insert the entire assembly into any standard 1.25\" focuser or visual back.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eZWO-EFW-7X36-25\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eElectronic Filter Wheel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupported Filter Size\u003c\/td\u003e\n\u003ctd\u003e36mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Capacity\u003c\/td\u003e\n\u003ctd\u003e7 Positions\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Mounting\u003c\/td\u003e\n\u003ctd\u003eDrop-In (Unmounted)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus Consumption\u003c\/td\u003e\n\u003ctd\u003e20 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Source\u003c\/td\u003e\n\u003ctd\u003eUSB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eEFW 7x36mm Filter Wheel Body\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eM42M-M42M (T2-T2) Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e1.25\" Nosepiece\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e1.25\" Cover \u0026amp; Cap\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e0.5 Meter USB-C Cable\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e2 Meter USB-C Cable\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eFilter Masks\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 10\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eM2.5x6 Screws\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 6\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eM2x4 Screws\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 26\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eM4x12 Screws\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 2\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003ePhillips Head Screwdriver\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.zwoastro.com\/software\/\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/zwo-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eZWO 2-Year Limited Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ZWO","offers":[{"title":"Default Title","offer_id":50706906808605,"sku":"ZWO-EFW-7x36-25","price":419.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/ZWO-EFW-7x36-25.png?v=1765339601"}],"url":"https:\/\/davidastro.com\/en-us\/collections\/zwo-efw-electronic-filter-wheels.oembed","provider":"David Astro","version":"1.0","type":"link"}