{"product_id":"zwo-efw-7-36-mm-electronic-filter-wheel-7-position-usb-c-wheel-for-36-mm-filters","title":"ZWO EFW-7×36 mm Electronic Filter Wheel | 7-Position USB-C Wheel for 36 mm Filters","description":"\u003ch1 data-start=\"234\" data-end=\"273\"\u003eZWO EFW-7×36 mm (EFW-7x36-25)\u003c\/h1\u003e\n\u003cp data-start=\"274\" data-end=\"349\"\u003eElectronic Filter Wheel · 7 Positions · 36 mm Unmounted Filters · USB-C\u003c\/p\u003e\n\u003cp data-start=\"351\" data-end=\"771\"\u003eDesigned for serious deep-sky imagers using APS-C and full-frame monochrome cameras, the ZWO EFW-7×36 mm provides seven precisely indexed filter positions in ZWO’s newest EFW-25 housing. This next-generation design merges advanced light-leak control, a rigid CNC-machined chassis, and quiet, dependable stepper-motor rotation—all in a slim body engineered for clean, flat-field illumination with 36 mm unmounted filters.\u003c\/p\u003e\n\u003cp data-start=\"773\" data-end=\"992\"\u003eFor imagers running LRGB, SHO, and an additional specialty filter, this wheel gives you the capacity to load an entire workflow at once, reducing setup time and keeping your imaging train sealed, aligned, and automated.\u003c\/p\u003e\n\u003chr data-start=\"994\" data-end=\"997\"\u003e\n\u003ch2 data-start=\"999\" data-end=\"1072\"\u003eImproved Light-Leak Protection for High-Quality Calibration Frames\u003c\/h2\u003e\n\u003cp data-start=\"1074\" data-end=\"1142\"\u003eThe EFW-25 series introduces ZWO’s redesigned light-blocking system:\u003c\/p\u003e\n\u003cul data-start=\"1144\" data-end=\"1386\"\u003e\n\u003cli data-start=\"1144\" data-end=\"1229\"\u003e\n\u003cp data-start=\"1146\" data-end=\"1229\"\u003e\u003cstrong data-start=\"1146\" data-end=\"1174\"\u003eRefined slot-fit chassis\u003c\/strong\u003e for a tighter seal between the front and rear plates\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1230\" data-end=\"1290\"\u003e\n\u003cp data-start=\"1232\" data-end=\"1290\"\u003e\u003cstrong data-start=\"1232\" data-end=\"1260\"\u003eDual light-blocking pads\u003c\/strong\u003e at critical side interfaces\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1291\" data-end=\"1386\"\u003e\n\u003cp data-start=\"1293\" data-end=\"1386\"\u003e\u003cstrong data-start=\"1293\" data-end=\"1329\"\u003eFully enclosed motor compartment\u003c\/strong\u003e preventing light ingress and improving dust resistance\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1388\" data-end=\"1573\"\u003eThese upgrades help maintain uniform flats and consistent background levels—especially important when shooting narrowband filters on large sensors, where gradients are easier to detect.\u003c\/p\u003e\n\u003chr data-start=\"1575\" data-end=\"1578\"\u003e\n\u003ch2 data-start=\"1580\" data-end=\"1638\"\u003eSeven-Position Carousel for 36 mm Unmounted Filters\u003c\/h2\u003e\n\u003cp data-start=\"1640\" data-end=\"1710\"\u003eIdeal for APS-C and many full-frame imaging setups, the wheel accepts:\u003c\/p\u003e\n\u003cul data-start=\"1712\" data-end=\"1747\"\u003e\n\u003cli data-start=\"1712\" data-end=\"1747\"\u003e\n\u003cp data-start=\"1714\" data-end=\"1747\"\u003e\u003cstrong data-start=\"1714\" data-end=\"1747\"\u003eSeven 36 mm unmounted filters\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1749\" data-end=\"1886\"\u003eThis configuration provides complete coverage for \u003cstrong data-start=\"1799\" data-end=\"1830\"\u003eLRGB + SHO + optional extra\u003c\/strong\u003e filters such as IR, continuum, or luminance variations.\u003c\/p\u003e\n\u003cp data-start=\"1888\" data-end=\"2166\"\u003eThe internal disk is machined from \u003cstrong data-start=\"1923\" data-end=\"1946\"\u003e6061 aluminum alloy\u003c\/strong\u003e, giving the wheel excellent rigidity with minimal weight.\u003cbr data-start=\"2004\" data-end=\"2007\"\u003eDespite its larger format, the wheel maintains a slim \u003cstrong data-start=\"2061\" data-end=\"2081\"\u003e~20 mm thickness\u003c\/strong\u003e, helping preserve backfocus in imaging trains using OAGs, tilt plates, and reducers.\u003c\/p\u003e\n\u003chr data-start=\"2168\" data-end=\"2171\"\u003e\n\u003ch2 data-start=\"2173\" data-end=\"2222\"\u003ePower, Connectivity \u0026amp; Software Integration\u003c\/h2\u003e\n\u003cp data-start=\"2224\" data-end=\"2287\"\u003eThe EFW-7×36 mm uses a single USB-C port for power and control:\u003c\/p\u003e\n\u003cul data-start=\"2289\" data-end=\"2412\"\u003e\n\u003cli data-start=\"2289\" data-end=\"2322\"\u003e\n\u003cp data-start=\"2291\" data-end=\"2322\"\u003e\u003cstrong data-start=\"2291\" data-end=\"2306\"\u003ePower draw:\u003c\/strong\u003e ~120 mA at 5V\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2323\" data-end=\"2374\"\u003e\n\u003cp data-start=\"2325\" data-end=\"2374\"\u003e\u003cstrong data-start=\"2325\" data-end=\"2345\"\u003eCables included:\u003c\/strong\u003e 0.5 m \u0026amp; 2 m USB-A to USB-C\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2375\" data-end=\"2412\"\u003e\n\u003cp data-start=\"2377\" data-end=\"2412\"\u003e\u003cstrong data-start=\"2377\" data-end=\"2412\"\u003eNo external 12V supply required\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"2414\" data-end=\"2433\"\u003eFully supported by:\u003c\/p\u003e\n\u003cul data-start=\"2435\" data-end=\"2526\"\u003e\n\u003cli data-start=\"2435\" data-end=\"2449\"\u003e\n\u003cp data-start=\"2437\" data-end=\"2449\"\u003e\u003cstrong data-start=\"2437\" data-end=\"2447\"\u003eASIAIR\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2450\" data-end=\"2467\"\u003e\n\u003cp data-start=\"2452\" data-end=\"2467\"\u003e\u003cstrong data-start=\"2452\" data-end=\"2465\"\u003eASIStudio\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2468\" data-end=\"2489\"\u003e\n\u003cp data-start=\"2470\" data-end=\"2489\"\u003e\u003cstrong data-start=\"2470\" data-end=\"2487\"\u003eASCOM drivers\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2490\" data-end=\"2526\"\u003e\n\u003cp data-start=\"2492\" data-end=\"2526\"\u003e\u003cstrong data-start=\"2492\" data-end=\"2526\"\u003eZWO SDK-based imaging software\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"2528\" data-end=\"2651\"\u003eThe internal high-precision stepper motor offers accurate, bidirectional indexing for fully automated workflow integration.\u003c\/p\u003e\n\u003chr data-start=\"2653\" data-end=\"2656\"\u003e\n\u003ch2 data-start=\"2658\" data-end=\"2678\"\u003eCompatibility\u003c\/h2\u003e\n\u003cp data-start=\"2680\" data-end=\"2713\"\u003eThis wheel is an ideal match for:\u003c\/p\u003e\n\u003cul data-start=\"2715\" data-end=\"2945\"\u003e\n\u003cli data-start=\"2715\" data-end=\"2755\"\u003e\n\u003cp data-start=\"2717\" data-end=\"2755\"\u003e\u003cstrong data-start=\"2717\" data-end=\"2734\"\u003eASI2600MM Pro\u003c\/strong\u003e (APS-C monochrome)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2756\" data-end=\"2776\"\u003e\n\u003cp data-start=\"2758\" data-end=\"2776\"\u003e\u003cstrong data-start=\"2758\" data-end=\"2774\"\u003eASI533MM Pro\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2777\" data-end=\"2815\"\u003e\n\u003cp data-start=\"2779\" data-end=\"2815\"\u003e\u003cstrong data-start=\"2779\" data-end=\"2813\"\u003eASI071 \/ similar APS-C sensors\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2816\" data-end=\"2874\"\u003e\n\u003cp data-start=\"2818\" data-end=\"2874\"\u003eFast refractors where 36 mm filters prevent vignetting\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2875\" data-end=\"2945\"\u003e\n\u003cp data-start=\"2877\" data-end=\"2945\"\u003eSystems requiring compact spacing around a ZWO OAG or tilt adapter\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"2947\" data-end=\"3014\"\u003eCompatible with the entire line of \u003cstrong data-start=\"2982\" data-end=\"3013\"\u003eZWO 36 mm unmounted filters\u003c\/strong\u003e.\u003c\/p\u003e\n\u003chr data-start=\"3016\" data-end=\"3019\"\u003e\n\u003ch2 data-start=\"3021\" data-end=\"3047\"\u003eWhat’s in the Box\u003c\/h2\u003e\n\u003cp data-start=\"3048\" data-end=\"3130\"\u003e\u003cem data-start=\"3048\" data-end=\"3130\"\u003e(Based on standard EFW-25 packaging; exact contents may vary slightly by model.)\u003c\/em\u003e\u003c\/p\u003e\n\u003cul data-start=\"3132\" data-end=\"3373\"\u003e\n\u003cli data-start=\"3132\" data-end=\"3144\"\u003e\n\u003cp data-start=\"3134\" data-end=\"3144\"\u003eEFW Body\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3145\" data-end=\"3167\"\u003e\n\u003cp data-start=\"3147\" data-end=\"3167\"\u003e36 mm Filter Masks\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3168\" data-end=\"3232\"\u003e\n\u003cp data-start=\"3170\" data-end=\"3232\"\u003eThreaded Adapter (M54 or M42 configuration depending on kit)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3233\" data-end=\"3271\"\u003e\n\u003cp data-start=\"3235\" data-end=\"3271\"\u003eM2, M2.5, and M4 Screw Assortments\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3272\" data-end=\"3304\"\u003e\n\u003cp data-start=\"3274\" data-end=\"3304\"\u003e3×75 mm Phillips Screwdriver\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3305\" data-end=\"3325\"\u003e\n\u003cp data-start=\"3307\" data-end=\"3325\"\u003eMounting Bracket\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3326\" data-end=\"3349\"\u003e\n\u003cp data-start=\"3328\" data-end=\"3349\"\u003eUSB 2.0 Cable (2 m)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3350\" data-end=\"3373\"\u003e\n\u003cp data-start=\"3352\" data-end=\"3373\"\u003eUSB 2.0 Cable (0.5 m)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"3375\" data-end=\"3378\"\u003e\n\u003ch2 data-start=\"3380\" data-end=\"3398\"\u003eImaging Tip\u003c\/h2\u003e\n\u003cp data-start=\"3400\" data-end=\"3780\"\u003eWhen installing 36 mm unmounted filters, always use the included masks to center each filter precisely. Proper alignment ensures optimal edge illumination—especially critical for APS-C sensors where even slight decentering can create off-axis gradients. After installing your filter set, run a full flat-calibration sequence to confirm uniform response across all seven positions.\u003c\/p\u003e","brand":"ZWO","offers":[{"title":"Default Title","offer_id":55346154078281,"sku":"EFW73625","price":299.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0573\/7974\/9961\/files\/7X36.jpg?v=1765908197","url":"https:\/\/astronomics.com\/products\/zwo-efw-7-36-mm-electronic-filter-wheel-7-position-usb-c-wheel-for-36-mm-filters","provider":"Astronomics","version":"1.0","type":"link"}