{"title":"ZWO Adapters","description":"\u003cp\u003eZWO adapters connect ZWO cameras, filter wheels and off-axis guiders to each other and to your telescope at the right back focus. The range covers M42 (T2), M48 and M54 threads: M54 to M48 and M54 to M42 adapters, M48 to M42 adapters, and T2 male to male or female to female couplers.\u003c\/p\u003e\u003cp\u003eExtensions of 16.5mm and 21mm in M42, M48 and M54 fine-tune spacing to your flattener or reducer, and 1.25\" T-mount holders accept eyepiece-size accessories.\u003c\/p\u003e","products":[{"product_id":"zwo-t-mount-adapter-1-25","title":"ZWO T-Mount Adapter - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n    \u003cli\u003eConnects T-threaded cameras to 1.25\" focusers\u003c\/li\u003e\n    \u003cli\u003eStandard M42x0.75 male T-threads\u003c\/li\u003e\n    \u003cli\u003eInternally threaded for 1.25\" astronomy filters\u003c\/li\u003e\n    \u003cli\u003eDurable black anodized aluminum construction\u003c\/li\u003e\n    \u003cli\u003eEnables prime-focus astrophotography\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\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 1.25\" T-Mount Adapter\u003c\/h2\u003e\n                    \u003cp\u003eThe ZWO 1.25\" T-Mount Adapter is the essential link for prime-focus astrophotography, allowing you to connect any camera with standard M42x0.75 T-threads directly to a telescope's 1.25\" focuser or eyepiece holder. Machined from black anodized aluminum, this adapter provides a secure, light-tight connection, turning your telescope into a powerful telephoto lens for your astronomy camera or DSLR (with appropriate T-Ring). Its internal M28.5x0.6 threads also allow you to mount standard 1.25\" filters, perfect for adding light pollution, UV\/IR cut, or narrowband filters to your imaging train without needing a separate filter wheel.\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\u003ePrime-Focus Imaging with M42 Threads\u003c\/h3\u003e\n                    \u003cp\u003eThis adapter is the most direct way to achieve prime-focus imaging. By connecting your camera's T-threads (M42x0.75) to the telescope's 1.25\" focuser, you place the camera sensor at the telescope's focal plane. This configuration maximizes image brightness and field of view, making it ideal for capturing everything from the Moon and planets to faint deep-sky objects.\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\u003eIntegrated 1.25\" Filter Cell\u003c\/h3\u003e\n                    \u003cp\u003eA key feature of the ZWO 1.25\" T-Mount is its internal threading, designed to accept any standard 1.25\" astronomy filter. This lets you easily thread in a light pollution filter for urban imaging or a UV\/IR cut filter to sharpen planetary details with a color camera. This integration simplifies your imaging setup, keeping the optical path short and rigid.\u003c\/p\u003e\n                    \u003cul\u003e\n                        \u003cli\u003e\n\u003cstrong\u003eSecure Connection:\u003c\/strong\u003e Precision-machined from a single piece of aluminum for a flex-free fit between your camera and telescope.\u003c\/li\u003e\n                        \u003cli\u003e\n\u003cstrong\u003eStandard Threads:\u003c\/strong\u003e Features a male M42x0.75 T-thread for universal compatibility with ZWO cameras, other astronomy cameras, and DSLR T-Rings.\u003c\/li\u003e\n                        \u003cli\u003e\n\u003cstrong\u003eMatte Black Finish:\u003c\/strong\u003e The interior is blackened to absorb stray light and prevent reflections, ensuring maximum contrast in your images.\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 cameras can I use with the ZWO 1.25\" T-Mount Adapter?\u003c\/h3\u003e\n        \u003c\/div\u003e\n        \u003cdiv class=\"DAV-accordion-A\"\u003e\n            \u003cp\u003eYou can use any camera that has a female T-thread (M42x0.75). This includes all ZWO astronomy cameras, as well as DSLRs and mirrorless cameras when they are fitted with a brand-specific T-Ring.\u003c\/p\u003e\n        \u003c\/div\u003e\n        \u003cdiv class=\"DAV-accordion\"\u003e\n            \u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I attach a filter to the ZWO T-Mount Adapter?\u003c\/h3\u003e\n        \u003c\/div\u003e\n        \u003cdiv class=\"DAV-accordion-A\"\u003e\n            \u003cp\u003eThe 1.25\" nosepiece barrel is internally threaded with standard M28.5x0.6 filter threads. Simply screw your 1.25\" filter directly into the barrel of the adapter before inserting it into the telescope's focuser.\u003c\/p\u003e\n        \u003c\/div\u003e\n        \u003cdiv class=\"DAV-accordion\"\u003e\n            \u003ch3 class=\"DAV-accordion-Q\"\u003eIs this adapter suitable for visual use with an eyepiece?\u003c\/h3\u003e\n        \u003c\/div\u003e\n        \u003cdiv class=\"DAV-accordion-A\"\u003e\n            \u003cp\u003eNo, this adapter is designed specifically for astrophotography. It connects a camera to a telescope and does not have a holder for an eyepiece. For visual use, you would insert an eyepiece directly into the focuser.\u003c\/p\u003e\n        \u003c\/div\u003e\n        \u003cdiv class=\"DAV-accordion\"\u003e\n            \u003ch3 class=\"DAV-accordion-Q\"\u003eWill I be able to reach focus with the ZWO 1.25\" T-Mount Adapter on my Newtonian reflector?\u003c\/h3\u003e\n        \u003c\/div\u003e\n        \u003cdiv class=\"DAV-accordion-A\"\u003e\n            \u003cp\u003eMany Newtonian reflectors have limited back-focus. While this adapter is very short, you may still need a Barlow lens placed before the adapter to extend the focal point and reach focus with your camera. Refractors and Schmidt-Cassegrain telescopes typically have sufficient focus travel.\u003c\/p\u003e\n        \u003c\/div\u003e\n        \u003cdiv class=\"DAV-accordion\"\u003e\n            \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the difference between a T-Mount and a C-Mount?\u003c\/h3\u003e\n        \u003c\/div\u003e\n        \u003cdiv class=\"DAV-accordion-A\"\u003e\n            \u003cp\u003eA T-Mount uses M42x0.75 threads and has a flange distance of 55mm (when used with a DSLR T-Ring). A C-Mount is smaller (1\"x32 TPI thread) with a 17.526mm flange distance. This ZWO adapter is a T-Mount adapter and is not compatible with C-Mount cameras without an additional adapter.\u003c\/p\u003e\n        \u003c\/div\u003e\n        \u003cdiv class=\"DAV-accordion\"\u003e\n            \u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the ZWO T-Mount Adapter add any magnification?\u003c\/h3\u003e\n        \u003c\/div\u003e\n        \u003cdiv class=\"DAV-accordion-A\"\u003e\n            \u003cp\u003eNo, this adapter does not contain any optics and does not change the magnification. It serves only as a physical connection, allowing your camera to use the native focal length of your telescope.\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-T-MOUNT\u003c\/td\u003e\n                \u003c\/tr\u003e\n                \u003ctr\u003e\n                    \u003ctd\u003eAdapter Type\u003c\/td\u003e\n                    \u003ctd\u003eT-Mount to 1.25\" Nosepiece\u003c\/td\u003e\n                \u003c\/tr\u003e\n                \u003ctr\u003e\n                    \u003ctd\u003eTelescope Connection\u003c\/td\u003e\n                    \u003ctd\u003e1.25\" Barrel\u003c\/td\u003e\n                \u003c\/tr\u003e\n                \u003ctr\u003e\n                    \u003ctd\u003eCamera Connection\u003c\/td\u003e\n                    \u003ctd\u003eMale T \/ T2 Thread (M42x0.75)\u003c\/td\u003e\n                \u003c\/tr\u003e\n                \u003ctr\u003e\n                    \u003ctd\u003eFilter Compatibility\u003c\/td\u003e\n                    \u003ctd\u003eInternal 1.25\" Filter Threads (M28.5x0.6)\u003c\/td\u003e\n                \u003c\/tr\u003e\n                \u003ctr\u003e\n                    \u003ctd\u003eMaterial\u003c\/td\u003e\n                    \u003ctd\u003eBlack Anodized Aluminum\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 1.25\" T-Mount Adapter\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        \u003ca href=\"https:\/\/davidastro.com\/pages\/zwo-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eZWO 2-Year Warranty\u003c\/a\u003e\n    \u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ZWO","offers":[{"title":"Default Title","offer_id":44967383597341,"sku":"ZWO-T-Mount","price":25.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/ZWO-1-25-inch-T-Mount-Adapter.jpg?v=1742409219"},{"product_id":"zwo-t2-adapter-11mm","title":"ZWO T2 Female to Female Adapter - 11mm","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eAdds exactly 11 mm of spacing to your imaging train\u003c\/li\u003e\n\u003cli\u003eFemale M42x0.75 T2 threads on both sides\u003c\/li\u003e\n\u003cli\u003eConnects two male T-threaded components\u003c\/li\u003e\n\u003cli\u003eBlack anodized aluminum construction minimizes reflections\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\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 T2 Female to Female Adapter - 11mm\u003c\/h2\u003e\n\u003cp\u003eThe ZWO T2 to T2 11mm Extender provides a precise 11mm of optical path length, connecting two male-threaded components with its standard female M42x0.75 T-threads. This black anodized adapter is the original equipment spacer included all ZWO 6.5mm backfocus cooled cameras, making it the definitive replacement part for achieving correct back focus with that camera system.\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\u003eAchieve Critical 11mm Spacing\u003c\/h3\u003e\n\u003cp\u003eThis adapter adds exactly 11mm of distance, a critical value for achieving the standard 55mm back focus when using specific ZWO cameras, filter wheels, and off-axis guiders. Its female-to-female design allows you to securely join accessories that both terminate in male T-threads, such as a camera nosepiece and a filter drawer, maintaining perfect optical alignment.\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\u003eDurable M42x0.75 Construction\u003c\/h3\u003e\n\u003cp\u003eMachined from a single piece of black anodized aluminum, the ZWO T2-T2-11 extender is both lightweight and rigid, preventing flexure in the imaging train. The interior surfaces are blackened to absorb stray light and improve contrast by preventing internal reflections from reaching the sensor.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard T-Threads:\u003c\/strong\u003e Features M42x0.75 female threads for universal compatibility with the vast majority of astronomy accessories.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eASI1600 Replacement:\u003c\/strong\u003e Serves as a direct, factory-spec replacement for the 11mm spacer originally included with ASI1600 cameras, ensuring you can restore your original imaging configuration perfectly.\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 primary use for the ZWO T2-T2-11 11mm extender?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe ZWO T2-T2-11 is used to add a precise \u003cstrong\u003e11mm\u003c\/strong\u003e of spacing in an M42x0.75 threaded imaging train. It's most commonly used to help achieve the standard 55mm back focus required by many field flatteners and coma correctors, especially with ZWO cameras like the ASI1600 series.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs this the same 11mm spacer that comes with the ZWO ASI1600MM Pro?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this is the identical 11mm female-to-female T2 spacer that is included as a stock component with all cameras in the ASI1600 series. It is the official replacement part from ZWO.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I use the ZWO 11mm extender to reach 55mm of back focus with an ASI1600 and a 20mm filter wheel?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe standard configuration to achieve 55mm of back focus with an ASI1600 camera and a 20mm thick ZWO filter wheel often uses this extender. The optical path is calculated as follows:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eASI1600 Camera Sensor to Flange: \u003cstrong\u003e6.5mm\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eZWO EFW (Electronic Filter Wheel): \u003cstrong\u003e20mm\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eT2-T2 Adapter (between the EFW and the 11mm extender): \u003cstrong\u003e2mm\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eThis T2-T2 Extender: \u003cstrong\u003e11mm\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eZWO 16.5mm T2 Extender: \u003cstrong\u003e16.5mm\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThis combination totals \u003cstrong\u003e56mm\u003c\/strong\u003e. The extra 1mm compensates for the optical path added by the filter glass, giving an effective 55mm back focus.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eAre the threads on this ZWO adapter male or female?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe ZWO T2-T2-11 extender has \u003cstrong\u003efemale M42x0.75 T-threads on both sides\u003c\/strong\u003e. This allows it to connect two accessories that both have male T-threads.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this ZWO 11mm adapter cause vignetting?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe adapter has a clear aperture consistent with the M42 (T2) standard. It is designed to work without vignetting on sensors up to the Four Thirds format, such as the one used in the ASI1600 camera series. It may cause vignetting on full-frame (36mm x 24mm) sensors, which typically require wider M48 or M54 threads.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat material is the ZWO T2-T2-11 adapter made of?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis extender is machined from lightweight, durable aluminum and has a black anodized finish to minimize weight and prevent unwanted reflections within your optical train.\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-T2-T2-11\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMPN\u003c\/td\u003e\n\u003ctd\u003eZWO T2-T2-11\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnector Type\u003c\/td\u003e\n\u003ctd\u003eM42 x 0.75 (T2) Female, Both Sides\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Length\u003c\/td\u003e\n\u003ctd\u003e11 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eZWO T2 to T2 11mm Extender\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\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":44967384383773,"sku":"ZWO-T2-T2-11","price":25.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/ZWO-11mm-T2-Adapter-1__18970.1596910045.1280.1280.jpg?v=1684341750"},{"product_id":"zwo-m48-m48-adapter-16-5mm","title":"ZWO M48 Extension - 16.5mm","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eAdds exactly 16.5 mm of spacing to an M48 imaging train\u003c\/li\u003e\n\u003cli\u003eM48x0.75 male and female threads\u003c\/li\u003e\n\u003cli\u003eWide 43.2 mm clear aperture prevents vignetting with full-frame sensors\u003c\/li\u003e\n\u003cli\u003eMachined from black anodized aluminum for rigidity and stray light control\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\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 M48 Male to M48 Female Extender - 16.5 mm\u003c\/h2\u003e\n\u003cp\u003eThe ZWO M48 Male to M48 Female Extender adds a precise 16.5 mm of length to your imaging train, solving a critical back focus requirement for many common astrophotography setups. This M48 threaded spacer is the component needed to achieve the standard 55 mm back focus distance with a ZWO cooled camera and its included 21 mm extender, in imaging trains that do not use an off-axis guider.\n\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\u003eAchieving the Standard 55 mm Back Focus\u003c\/h3\u003e\n\u003cp\u003eMost field flatteners and reducers require a rigid 55 mm distance from their flange to the camera sensor for optimal edge-of-field star correction. ZWO cooled cameras typically have 17.5 mm of back focus, and the 21 mm extender included with the camera adds 21 mm. This leaves a 16.5 mm gap that this extender is machined to fill perfectly, eliminating the need to stack multiple adapters and the potential for optical tilt.\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\u003eM48 Threads for Unvignetted, Full-Frame Imaging\u003c\/h3\u003e\n\u003cp\u003eThis extender uses M48x0.75 threads on both the male and female sides, maintaining a wide, unvignetted light path from your corrector to your sensor. Unlike narrower T2 (M42) threads, the 43.2 mm clear aperture is essential for illuminating the corners of full-frame sensors without dimming or clipping the starfield. The single-piece, black anodized aluminum body ensures rigidity and absorbs stray light.\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 this specific 16.5 mm ZWO M48 extension?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis \u003cstrong\u003e16.5 mm\u003c\/strong\u003e length is required to achieve the standard \u003cstrong\u003e55 mm\u003c\/strong\u003e back focus when using specific ZWO components together. A typical ZWO cooled camera (17.5 mm) plus the included 21 mm extender plus this 16.5 mm spacer equals exactly 55 mm.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need the ZWO M48 16.5mm extension if I use an off-axis guider?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The \u003cstrong\u003e16.5 mm extension\u003c\/strong\u003e is used in imaging trains without an off-axis guider (OAG). An OAG adds its own optical length, so it takes the place of this spacer. When you add an OAG or a filter wheel, calculate your spacing from the optical length of each component so the total from the corrector flange to the sensor is 55 mm.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat are M48 threads and why are they important for this ZWO extension?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eM48 threads\u003c\/strong\u003e (also known as \"wide T-threads\" or 2-inch filter threads) have a diameter of 48 mm with a 0.75 mm pitch. They provide a larger clear aperture than older T2 (M42) threads, which is critical for preventing vignetting (darkened corners) on cameras with large sensors, such as full-frame or APS-C formats.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the ZWO M48 16.5mm extension threaded for filters?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this is a spacer extension, not a filter cell. It is not designed to have filters threaded directly into it. Filters should be placed in a dedicated filter wheel, filter drawer, or threaded onto the nosepiece of your camera or the front of your reducer.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs this ZWO 16.5mm spacer compatible with non-ZWO equipment?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. As long as your other components use standard M48x0.75 male and female threads, this extender will connect perfectly. It is a universal part for any imaging train that requires precisely 16.5 mm of M48 spacing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the total length added by this ZWO M48 extension?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe extender provides exactly \u003cstrong\u003e16.5 mm\u003c\/strong\u003e of optical path length. The length of the male threads is not counted, as they seat inside the female connector of the next component in your train.\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-M48-EXT16.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnector Type (Side A)\u003c\/td\u003e\n\u003ctd\u003eM48x0.75 Male\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnector Type (Side B)\u003c\/td\u003e\n\u003ctd\u003eM48x0.75 Female\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength\u003c\/td\u003e\n\u003ctd\u003e16.5 mm\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 16.5 mm M48 Male to M48 Female Spacer Extension\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\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":44967385596189,"sku":"ZWO-M48-EXT16.5","price":32.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/ZWO-M4816.5mm-Extension-1.jpg?v=1697733326"},{"product_id":"zwo-m42-m42-adapter-21mm","title":"ZWO M42 Extension - 21mm","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eAdds exactly 21mm of spacing to an M42 optical train\u003c\/li\u003e\n\u003cli\u003eM42x0.75 female threads on one side, male threads on the other\u003c\/li\u003e\n\u003cli\u003eMachined aluminum with a black anodized finish\u003c\/li\u003e\n\u003cli\u003eSolves critical back focus requirements for cameras and correctors\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\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 21mm M42 to M42 Extension\u003c\/h2\u003e\n\u003cp\u003eThe ZWO 21mm M42 to M42 Extension adds a fixed 21mm of length to any optical train using standard M42x0.75 T-threads. This spacer is a fundamental component for achieving the precise back focus required by field flatteners, coma correctors, and ZWO's own line of cooled cameras which standardize on a 55mm back focus distance.\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\u003eAchieving 55mm Back Focus with a 21mm Spacer\u003c\/h3\u003e\n\u003cp\u003eCorrect spacing is not optional in astrophotography; it's the difference between sharp stars edge-to-edge and distorted, comatic images. This 21mm extension is a key part of the standard ZWO 55mm back focus solution. When combined with a 16.5mm spacer and the 17.5mm sensor-to-flange distance of many ZWO cameras, this 21mm piece completes the required 55mm path, ensuring your corrector performs exactly as designed.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision Machining:\u003c\/strong\u003e Machined from black anodized aluminum to maintain optical alignment and eliminate internal reflections that can reduce contrast.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard M42 T-Threads:\u003c\/strong\u003e Features male M42x0.75 threads on one side and female M42x0.75 threads on the other, making it a universal fit for most astronomy cameras, filter wheels, and off-axis guiders.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFixed, Non-Flexing Length:\u003c\/strong\u003e Unlike variable extenders, this fixed 21mm tube provides a rigid, repeatable connection that prevents tilt in the imaging train.\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 ZWO 21mm M42 Extension used for?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe ZWO 21mm M42 Extension is used to add a precise 21mm of distance in an astrophotography imaging train. Its primary purpose is to help achieve the specific back focus distance required by optical correctors like field flatteners or coma correctors, most of which require a 55mm distance from the corrector's flange to the camera sensor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I use the ZWO 21mm extension to reach 55mm of back focus with my ZWO camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eMany ZWO cameras have a 17.5mm back focus distance from the front flange to the sensor. To achieve the standard 55mm, you need to add 37.5mm of spacers. This is typically done by combining this \u003cstrong\u003e21mm extension\u003c\/strong\u003e with a 16.5mm extension (55 - 17.5 = 37.5; 21 + 16.5 = 37.5). The exact combination depends on your specific camera and other accessories like filter wheels or off-axis guiders.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eAre the threads on the ZWO 21mm M42 Extension the same as T2 threads?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The terms M42, T-thread, and T2-thread all refer to the same metric thread standard: M42x0.75. This 21mm extension is compatible with any accessory that uses this common standard.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I stack multiple ZWO 21mm extensions?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile you can physically thread multiple extensions together, it is generally not recommended. Stacking many spacers can introduce potential tilt and flex into your imaging train. It is always better to use a single extension of the correct length if one is available.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this 21mm extension fit between my ZWO EFW filter wheel and ASI1600MM Pro camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The ZWO EFW and ASI1600MM Pro both use M42 T-threads. This 21mm extension can be placed between them or elsewhere in the M42 train to achieve the necessary spacing for your specific corrector and telescope configuration.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the ZWO 21mm M42 extension made of?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe extension is machined from aluminum and features a black anodized finish. This construction ensures it is lightweight, rigid, and has a non-reflective internal surface to maintain image contrast.\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-T2-EXT-21\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMPN\u003c\/td\u003e\n\u003ctd\u003eZWO T2-EXT-21\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnector Side A\u003c\/td\u003e\n\u003ctd\u003eM42 (T or T2) Female\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnector Side B\u003c\/td\u003e\n\u003ctd\u003eM42 (T or T2) Male\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength\u003c\/td\u003e\n\u003ctd\u003e21 mm\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\"\u003e21mm M42 to M42 Extension\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\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":44967386579229,"sku":"ZWO-T2-EXT-21","price":25.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/ZWO-M42-M42Adapter-21mm-1.jpg?v=1697662917"},{"product_id":"zwo-m42-adapter-for-oag","title":"ZWO M42 Adapter for OAG","description":"\u003c!-- more --\u003e\u003cp\u003e\u003cspan\u003eM4\u003c\/span\u003e\u003cspan\u003e2 adapter for main imaging camera\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/t\/6\/assets\/description_image_ZWO_M42_adapterOAG_ZWO_M42_adapter_1_description.jpeg?v=1684341984\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/t\/6\/assets\/description_image_ZWO_M42_adapterOAG_ZWO_M42_adapter_1_description.jpeg?v=1684341984\" alt=\"M42-adapter-OAG\" width=\"1024\" height=\"717\"\u003e\u003c\/a\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/t\/6\/assets\/description_image_ZWO_M42_adapterOAG_ZWO_M42_adapter_2_description.jpeg?v=1684341986\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/t\/6\/assets\/description_image_ZWO_M42_adapterOAG_ZWO_M42_adapter_2_description.jpeg?v=1684341986\" alt=\"M42-adapter-OAG-SIDE\" width=\"1024\" height=\"717\"\u003e\u003c\/a\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/t\/6\/assets\/description_image_ZWO_M42_adapterOAG_ZWO_M42_adapter_3_description.jpeg?v=1684341989\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/t\/6\/assets\/description_image_ZWO_M42_adapterOAG_ZWO_M42_adapter_3_description.jpeg?v=1684341989\" alt=\"M42adapter-OAGjpg\" width=\"1024\" height=\"853\"\u003e\u003c\/a\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/t\/6\/assets\/description_image_ZWO_M42_adapterOAG_ZWO_M42_adapter_4_description.jpeg?v=1684341991\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/t\/6\/assets\/description_image_ZWO_M42_adapterOAG_ZWO_M42_adapter_4_description.jpeg?v=1684341991\" alt=\"OAG1200x1000adapter\" width=\"1024\" height=\"853\"\u003e\u003c\/a\u003e\u003c\/p\u003e\u003cdiv data-custom-tab\u003e\n\u003cp data-custom-tab-title\u003eSpecifications\u003c\/p\u003e\n\u003cdiv\u003e\u003c\/div\u003e\n\u003c\/div\u003e","brand":"ZWO","offers":[{"title":"Default Title","offer_id":44967441367325,"sku":"ZWO-M42-adapter","price":25.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/ZWO-M42-Adapter-for-OAG-1__63335.1596910057.1280.1280.jpg?v=1684342005"},{"product_id":"zwo-m48-m42-adapter","title":"ZWO M48-M42 Adapter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConverts female M48x0.75 threads to female M42x0.75 T-threads\u003c\/li\u003e\n\u003cli\u003eAdds 0mm of optical path length to the imaging train\u003c\/li\u003e\n\u003cli\u003eStandard accessory with most ZWO cooled cameras\u003c\/li\u003e\n\u003cli\u003eDurable black anodized aluminum construction\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\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 M48 to M42 Adapter\u003c\/h2\u003e\n\u003cp\u003eThe ZWO M48 to M42 Adapter is the essential component for connecting accessories with different thread standards, converting the wider M48 (2-inch filter) thread to the universal M42 T-thread. This simple ring doesn't add any back focus, making it a compact solution for integrating filter wheels, flatteners, and cameras into a single, secure 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\u003eA Zero-Length Solution for Thread Incompatibility\u003c\/h3\u003e\n\u003cp\u003eThis adapter solves one of the most common connection problems in astrophotography. It threads into a female M48 port on an accessory such as a filter drawer or field flattener and presents a female M42 T-thread for a male M42 component such as an off-axis guider or T-ring. The adapter has a male M48 thread on the outside and a female M42 thread on the inside, so it sits within the M48 thread and occupies 0mm of optical distance.\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\u003eDesigned for ZWO Pro Camera Systems\u003c\/h3\u003e\n\u003cp\u003eWhile universally useful, this M48-M42 adapter is the same unit included with most ZWO cooled cameras. It's specifically designed to work with other ZWO accessories like the 16.5mm extender or an Off-Axis Guider (OAG). When used in these specific configurations, it provides the correct thread type without altering the designed total back focus of the system, ensuring you can reach the required 55 mm spacing without complex calculations.\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 primary use for the ZWO M48-M42 Adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIts primary function is to convert the larger M48x0.75 female thread, commonly found on 2-inch filter holders and field flatteners, into the smaller M42x0.75 female T-thread used by most astronomy cameras, T-rings, and off-axis guiders. This allows you to connect components that would otherwise be incompatible.\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 M48-M42 Adapter use?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe adapter itself has an optical path length of \u003cstrong\u003e0mm\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs this the same adapter that comes with ZWO cameras?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this is the same stock M48-M42 adapter ring that is included with most ZWO cooled cameras. It is offered here as a replacement part or for users who need to adapt other non-ZWO hardware.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the ZWO M48-M42 Adapter to connect a 2\" filter wheel to my camera's T-ring?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this is a perfect application. If your 2\" filter wheel or drawer has a female M48 thread and your T-ring has a male M42 thread, this adapter threads into the M48 port and accepts the M42 T-ring, consuming no additional back focus.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this ZWO adapter cause vignetting on my full-frame camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eBecause this adapter steps down from the larger M48 format to the smaller M42 T-thread, it can introduce vignetting on full-frame (24x36mm) sensors, especially in fast optical systems (f\/5 or lower). The M42 thread has a smaller clear aperture than M48, which can clip the light cone before it reaches the corners of a large sensor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat are the threads on the ZWO M48-M42 Adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe adapter has a male M48x0.75 thread on the outside and a female M42x0.75 T-thread on the inside.\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-M48-M42\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThread Conversion\u003c\/td\u003e\n\u003ctd\u003eM48x0.75 (Male) to M42x0.75 (Female)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Length\u003c\/td\u003e\n\u003ctd\u003e0 mm\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 M48 to M42 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\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":44967441563933,"sku":"ZWO-M48-M42","price":17.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/ZWO-M48-M42-Adapter.jpg?v=1732988275"},{"product_id":"zwo-adapter-2mm-m54m-m48f","title":"ZWO Adapter - 2mm M54(M)\/M48(F)","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConnects M54 Filter Wheels to M48 Accessories\u003c\/li\u003e\n\u003cli\u003eAdds Only 2 mm to Optical Path\u003c\/li\u003e\n\u003cli\u003eMaintains 55 mm Back Focus Standard\u003c\/li\u003e\n\u003cli\u003eKnurled Edge for Secure Grip\u003c\/li\u003e\n\u003cli\u003eDesigned for ZWO 2\" EFW and M54 Filter Drawer\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\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 M54 - M48 Adapter (2mm)\u003c\/h2\u003e\n\u003cp\u003eThe ZWO M54-M48 Adapter steps down the M54 threads on your 2-inch ZWO EFW or M54 filter drawer to the M48 standard for connecting M48-threaded correctors and accessories, adding only 2 mm of thickness to help maintain the critical 55 mm back focus distance required by most correctors.\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\u003eAchieve 55 mm Back Focus with a 2 mm Adapter\u003c\/h3\u003e\n\u003cp\u003eConnecting M48-threaded correctors and accessories to ZWO's larger M54 filter wheels presents a spacing challenge. This 2 mm adapter solves it by providing the exact thread conversion needed without consuming significant back focus. Its minimal 2 mm thickness is a deliberate design choice; a thicker adapter could make it impossible to reach the required 55 mm distance when using off-axis guiders or other 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\u003ePrecision Fit for ZWO's 2-inch Filter Wheels\u003c\/h3\u003e\n\u003cp\u003eThis adapter is purpose-built for ZWO's ecosystem, ensuring a secure, no-flex fit between the M54 female port on the 2\" EFW or M54 Filter Drawer and the M48 male threads of your flattener, corrector, or extension tube. The knurled outer edge gives you a firm grip for easy installation and removal, even in cold weather with gloves on, preventing accidental drops or cross-threading.\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 ZWO M54-M48 2mm Adapter used for?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis adapter connects a ZWO filter wheel or filter drawer that has a female M54 thread to a flattener, corrector or accessory that has a male M48 thread. Its primary purpose is to make these components compatible while using only \u003cstrong\u003e2 mm\u003c\/strong\u003e of the optical path, preserving precious 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 are compatible with this M54-M48 adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis adapter is specifically designed for ZWO accessories that use the M54 thread standard. This includes the \u003cstrong\u003eZWO 2\" Electronic Filter Wheel (EFW)\u003c\/strong\u003e and the \u003cstrong\u003eZWO M54 Filter Drawer\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI have a ZWO 2\" EFW and a refractor flattener with M48 threads. Will this adapter let me reach the 55 mm back focus?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this adapter is ideal for that scenario. It joins the telescope side of the EFW to your M48 flattener or adapter, and its thin \u003cstrong\u003e2 mm\u003c\/strong\u003e profile is specifically designed to be part of a standard \u003cstrong\u003e55 mm\u003c\/strong\u003e back focus imaging train. It lets you integrate the larger filter wheel without preventing you from reaching focus with a flattener or reducer.\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 a full-frame camera, will this ZWO adapter cause vignetting?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The M54 and M48 thread diameters are large enough to fully illuminate full-frame sensors without causing vignetting. This adapter maintains a clear light path, ensuring even illumination from edge to edge when imaging large targets like the Andromeda Galaxy (M31) or the North America Nebula (NGC 7000).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is the ZWO M54-M48 adapter only 2 mm thick?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e2 mm\u003c\/strong\u003e thickness is a critical design feature to preserve back focus. Many correctors require a precise 55 mm distance to the sensor. By being extremely thin, this adapter allows you to use a large-format filter wheel in an imaging train that might also include an off-axis guider, rotator, or other accessories that consume back focus.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I install the ZWO M54-M48 adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe adapter has male M54 threads and female M48 threads. Simply screw the male M54 side into the telescope-side M54 female port of your ZWO 2\" EFW or M54 Filter Drawer. Then, screw your M48 male-threaded flattener, corrector, or extension tube into the female M48 side of the adapter. The knurled edge provides a secure grip for hand-tightening.\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-M54M-M48F-2\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\u003eOptical Length\u003c\/td\u003e\n\u003ctd\u003e2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMale Thread\u003c\/td\u003e\n\u003ctd\u003eM54 x 0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFemale Thread\u003c\/td\u003e\n\u003ctd\u003eM48 x 0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eZWO 2\" EFW, ZWO M54 Filter Drawer\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\"\u003eZWO M54 (Male) to M48 (Female) 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\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 Manufacturer Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ZWO","offers":[{"title":"Default Title","offer_id":44967442055453,"sku":"ZWO-M54M-M48F-2","price":17.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/ZWO-M54M-M48F-2mm-Adapter-1__85158.1596910058.1280.1280.jpg?v=1684342017"},{"product_id":"zwo-t2-male-to-t2-male-adapter","title":"ZWO T2 Male to T2 Male Adapter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConnects two female M42 T-threaded components\u003c\/li\u003e\n\u003cli\u003eAdds a fixed 2mm of optical path length\u003c\/li\u003e\n\u003cli\u003eMale-to-male M42x0.75 thread on both sides\u003c\/li\u003e\n\u003cli\u003eDurable black anodized metal construction reduces reflections\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\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 T2 Male to T2 Male Adapter\u003c\/h2\u003e\n\u003cp\u003eThe ZWO T2 to T2 Male Adapter provides a rigid, secure connection between female M42 T-threaded accessories while adding exactly 2mm of back focus to your imaging train. Each side features 3 mm of thread depth, ensuring a stable, non-flexing link between critical components like filter wheels, off-axis guiders, and camera bodies.\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\u003eAchieve Precise 2mm Spacing\u003c\/h3\u003e\n\u003cp\u003eThis adapter serves a dual purpose: it converts any female T2 port into a male T2 port and functions as a precise 2mm spacer. This fixed length is critical for hitting the standard 55mm back focus distance required by many field flatteners and coma correctors when combining accessories of known thicknesses. Its machined metal body ensures your optical path length remains fixed and repeatable every time you set up.\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\u003eUniversal M42 T-Thread Standard\u003c\/h3\u003e\n\u003cp\u003eBuilt around the universal M42x0.75 T-thread standard, this adapter is compatible with the vast majority of astrophotography cameras, filter wheels, off-axis guiders, and other accessories. The black anodized finish minimizes stray light reflections inside your imaging train, protecting image contrast. This is a fundamental component for configuring a robust and modular imaging setup.\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 ZWO T2 Male to T2 Male Adapter typically used for?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis adapter is primarily used to connect two accessories that both have female T2 (M42x0.75) threads. It also acts as a spacer, adding a fixed \u003cstrong\u003e2 mm\u003c\/strong\u003e of length to the optical path, which is often necessary to achieve the correct back focus distance for a specific corrector or flattener.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this 2mm adapter help me achieve 55mm back focus with my ZWO camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt can be a key component. Achieving the standard 55mm back focus requires adding up the optical path length of every item in your imaging train (camera sensor depth, filter wheel, off-axis guider, and all spacers). This \u003cstrong\u003e2 mm\u003c\/strong\u003e adapter helps you reach that total when combined with other T-threaded spacers and accessories.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the ZWO T2 adapter to connect a ZWO filter wheel to a ZWO OAG?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this is a common application. If both your ZWO filter wheel and ZWO Off-Axis Guider present female T2 threads that need to be joined, this male-to-male adapter will bridge the connection while adding 2 mm of spacing between them.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the difference between T2, T-thread, and M42 threads?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn the context of astronomy, these terms are often used interchangeably to refer to the same standard: a metric thread with a \u003cstrong\u003e42 mm diameter\u003c\/strong\u003e and a \u003cstrong\u003e0.75 mm thread pitch\u003c\/strong\u003e (M42x0.75). This adapter conforms to that universal standard.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs this ZWO adapter made of metal or plastic?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe ZWO T2 to T2 adapter is machined from a single piece of \u003cstrong\u003eblack anodized metal\u003c\/strong\u003e for maximum rigidity and durability. This prevents flexure in the imaging train that could tilt your camera sensor and compromise your images.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the 2 mm length of the ZWO T2 adapter include the threads?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The adapter is \u003cstrong\u003e8 mm\u003c\/strong\u003e long overall, including 3 mm of thread on each side. Because those threads screw into the mating parts, it adds only \u003cstrong\u003e2 mm\u003c\/strong\u003e to the optical path. The 2 mm value is the one to use when calculating your total back focus distance.\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-T2-T2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnector Type (Side A)\u003c\/td\u003e\n\u003ctd\u003eMale M42x0.75 (T2-Thread)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnector Type (Side B)\u003c\/td\u003e\n\u003ctd\u003eMale M42x0.75 (T2-Thread)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Path Length\u003c\/td\u003e\n\u003ctd\u003e2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThread Depth\u003c\/td\u003e\n\u003ctd\u003e3 mm ± 0.1 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConstruction\u003c\/td\u003e\n\u003ctd\u003eBlack Anodized Metal\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 T2 Male to T2 Male Adapter (2 mm)\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\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":44967446806813,"sku":"ZWO-T2-T2","price":17.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/ZWO-T2-to-T2-Adapter-1__84161.1648822466.1280.1280.jpg?v=1684342148"},{"product_id":"zwo-t2-1-25-holder","title":"ZWO T2-1.25\" Holder","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConnects T2 (M42x0.75) Male Threads to 1.25\" Barrels\u003c\/li\u003e\n\u003cli\u003eNon-Marring Brass Compression Ring\u003c\/li\u003e\n\u003cli\u003eSecure Single-Screw Locking Mechanism\u003c\/li\u003e\n\u003cli\u003eDurable, Low-Profile Aluminum Construction\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 T2 to 1.25\" Holder\u003c\/h2\u003e\n\u003cp\u003eThe ZWO T2 to 1.25\" Holder provides a secure, non-marring connection between any component with T2 female threads and standard 1.25\" accessory barrels. This essential adapter allows you to integrate 1.25\" eyepieces, guide cameras, or Barlow lenses into an imaging train built around the M42x0.75 standard.\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 Secure Lock for Any 1.25\" Accessory\u003c\/h3\u003e\n\u003cp\u003eThis adapter bridges the gap between the common T2 thread standard used on filter wheels, off-axis guiders, and camera bodies, and the ubiquitous 1.25\" barrel format. A single, oversized thumbscrew makes it easy to lock and unlock accessories, even with gloves on, ensuring your camera or eyepiece is held firmly in the optical path without wobble or tilt.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eUniversal T2 Interface:\u003c\/strong\u003e The male T2 (M42x0.75) threads ensure compatibility with a vast ecosystem of astrophotography equipment from ZWO and other manufacturers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecise Centering:\u003c\/strong\u003e The compression ring design provides a uniform grip around the circumference of the barrel, which helps maintain better optical alignment compared to a simple set screw.\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\u003eBrass Compression Ring Protects 1.25\" Barrels\u003c\/h3\u003e\n\u003cp\u003eInstead of a steel screw driving directly into your accessory, this holder uses a soft brass compression ring. When you tighten the thumbscrew, the ring gently and evenly squeezes the barrel, holding it securely without leaving the scratches and gouges that devalue your equipment. This is the standard for connecting premium accessories where preserving the finish is as important as the connection itself.\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 ZWO T2-1.25\" Holder primarily used for?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe ZWO T2-1.25\" Holder is used to connect any 1.25\" accessory, such as an eyepiece, a small guide camera like the ASI120MM Mini, or a Barlow lens, to a component that has female T2 (M42x0.75) threads, like a filter wheel or an off-axis guider.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the ZWO T2-1.25\" Holder scratch my eyepieces or camera nosepieces?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The key feature of this holder is its \u003cstrong\u003ebrass compression ring\u003c\/strong\u003e. Unlike basic adapters that use a set screw to dig into the barrel, the compression ring provides a firm, even grip around the entire barrel without marring its surface.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I use the ZWO T2-1.25\" Holder to connect my ASI120MM camera to a ZWO filter wheel?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou would thread the T2 male side of this holder into the T2 female port on the camera-side of your ZWO filter wheel. Then, you can slide the 1.25\" nosepiece of your ASI120MM camera into the holder and tighten the thumbscrew to secure it for use as a guide camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the ZWO T2-1.25\" Holder to put a 1.25\" Barlow lens in my imaging train?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this is a common application. For example, you could thread this holder into a camera-facing T2 female port, such as the camera side of a filter wheel or T2 extension, slide the 1.25\" Barlow barrel into the holder, and then insert your camera's 1.25\" nosepiece into the Barlow to increase magnification for planetary imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat are T2 threads?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eT2 threads, also known as M42x0.75 threads, are a de facto standard in astrophotography for connecting cameras, filter wheels, off-axis guiders, and other accessories. They have a diameter of 42 mm and a thread pitch of 0.75 mm.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the ZWO T2-1.25\" Holder add to my back focus distance?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, like any adapter, it adds to the optical path length. While the body itself is low-profile, you must account for its length plus the insertion depth of your 1.25\" accessory when calculating your total back focus, especially if you are using a reducer or flattener with critical spacing requirements.\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-T2-1.25M\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Connection\u003c\/td\u003e\n\u003ctd\u003eT2 (M42x0.75) Male Thread\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Connection\u003c\/td\u003e\n\u003ctd\u003e1.25\" Barrel Receptacle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLocking Mechanism\u003c\/td\u003e\n\u003ctd\u003eBrass Compression Ring with Thumbscrew\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\"\u003eT2 to 1.25\" Holder\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":44967447658781,"sku":"ZWO-T2-1.25M","price":35.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/ZWO-T2-1-25-inch-Holder-1__69296.1596910061.1280.1280.jpg?v=1684342151"},{"product_id":"zwo-m54m-m48f-adapter-21mm","title":"ZWO M54(M)-M48(F) Adapter - 21mm","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eAdds exactly 21mm of optical path length\u003c\/li\u003e\n\u003cli\u003eConnects M54 male threads to M48 female threads\u003c\/li\u003e\n\u003cli\u003eStandard 2-inch filter threading on the M48 side\u003c\/li\u003e\n\u003cli\u003eBlack anodized aluminum construction minimizes reflections\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\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 M54(M)-M48(F) Adapter - 21mm\u003c\/h2\u003e\n\u003cp\u003eThe ZWO M54 to M48 adapter provides a fixed 21mm of extension, bridging the connection between full-frame ZWO cameras with M54 threads and correctors or accessories with standard M48 male threads. This adapter is a critical component for achieving precise back focus in imaging trains that require specific, non-standard spacing to reach the sensor at the correct distance.\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\u003eAchieving Precise 21mm Back Focus Spacing\u003c\/h3\u003e\n\u003cp\u003eIn astrophotography, hitting the exact back focus distance specified by your flattener or reducer is non-negotiable for a sharp, flat field. This adapter adds exactly 21mm of length, allowing you to fine-tune the spacing in your optical train. It's an essential tool when your camera, filter wheel, and off-axis guider combination doesn't add up to the required 55mm or other custom back focus distances.\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\u003eConnecting M54 Cameras to M48 Correctors\u003c\/h3\u003e\n\u003cp\u003eZWO's full-frame cameras use a wide M54 thread to minimize vignetting, while many flatteners, reducers, and correctors terminate in the M48x0.75 standard. This ZWO adapter screws into the camera with its M54 male thread and presents an M48 female thread for your corrector, ensuring broad compatibility across your equipment.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eM54 Male Thread:\u003c\/strong\u003e Connects directly to a ZWO full-frame camera with M54 threads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM48 Female Thread:\u003c\/strong\u003e Accepts standard 2-inch filters and connects to the M48 male thread of your corrector, flattener, or reducer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable Construction:\u003c\/strong\u003e Machined from black anodized aluminum to reduce internal reflections and provide a rigid connection that prevents flexure.\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's 21mm vs. Other M54-M48 Adapters\u003c\/h3\u003e\n\u003cp\u003eZWO offers a range of M54 to M48 adapters, and choosing the correct length is critical. The 21mm adapter is not a universal solution but a specific tool for a specific spacing requirement.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. ZWO 16.5mm Extender:\u003c\/strong\u003e The two lengths are often used together. In a train without an off-axis guider, a ZWO camera with 17.5mm of back focus, a 21mm extension, and the 16.5mm M48 extender give 17.5 + 21 + 16.5 = 55mm. Whether you need one, the other, or both depends entirely on the optical path length of the other components in your imaging train.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFixed Length Trade-off:\u003c\/strong\u003e Unlike a variable spacer, this 21mm adapter provides a fixed, rigid extension. This rigidity is a benefit, as it eliminates potential tilt, but it means you must calculate your required back focus precisely before purchasing.\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 purpose of the ZWO M54-M48 21mm adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis adapter serves two primary functions: it connects a camera with M54 threads to a corrector with the more common M48 male thread, and it adds a precise \u003cstrong\u003e21mm\u003c\/strong\u003e of spacing to help you achieve the correct back focus for your imaging system.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I use the ZWO 21mm adapter to achieve 55mm back focus with my ZWO camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou would use this 21mm adapter as part of a calculated imaging train. With a ZWO full-frame camera that has 17.5mm of back focus, this adapter brings the total to 38.5mm. Adding a 16.5mm M48 extender completes the train at 17.5mm + 21mm + 16.5mm = 55mm. If you add a filter wheel or off-axis guider, subtract its optical length and adjust your other spacers accordingly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I thread a 2-inch filter into the ZWO M54-M48 adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The female \u003cstrong\u003eM48\u003c\/strong\u003e side of the adapter is threaded to accept standard 2-inch astronomy filters (M48x0.75). This allows you to place a filter within the adapter itself, which can be useful in specific imaging configurations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this 21mm adapter connect my Sky-Watcher Quattro corrector to a full-frame ZWO camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, if your Sky-Watcher Quattro coma corrector terminates in an M48 male thread. The adapter's M48 female side threads onto the corrector and its M54 male side threads into the camera, all while adding 21mm to the optical path.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the ZWO M54-M48 21mm adapter compatible with non-ZWO equipment?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. As long as your equipment uses the standard M54x0.75 male thread and M48x0.75 female thread conventions, this adapter will work regardless of the brand. It is a universal part for connecting these two common astronomy thread sizes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy would I choose this fixed 21mm adapter instead of a variable spacer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA fixed adapter like this 21mm ZWO model offers superior rigidity and eliminates the risk of tilt that can be introduced by some variable or helical spacers. When you know the exact spacing you need, a fixed adapter is the most stable and reliable way to achieve it.\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-M54-M48-21\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnector Side A\u003c\/td\u003e\n\u003ctd\u003eM54 Male (camera side)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnector Side B\u003c\/td\u003e\n\u003ctd\u003eM48 Female (2\" Filter Thread, corrector side)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength\u003c\/td\u003e\n\u003ctd\u003e21 mm\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 M54 to M48 Extension - 21 mm\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\u003ca href=\"https:\/\/davidastro.com\/pages\/zwo-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eZWO 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ZWO","offers":[{"title":"Default Title","offer_id":44967454802205,"sku":"ZWO-M54-M48-21","price":35.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/ZWO-M54-M48-Adapter-21mm__10349.1597109851.1280.1280.jpg?v=1684342390"},{"product_id":"zwo-m42-m48-adapter-16-5mm","title":"ZWO M42-M48 Adapter - 16.5mm","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eAdds a precise 16.5mm of optical path length\u003c\/li\u003e\n\u003cli\u003eConnects male M42 (T2) threads to female M48 threads\u003c\/li\u003e\n\u003cli\u003eEssential for achieving standard 55mm back focus with specific ZWO accessories\u003c\/li\u003e\n\u003cli\u003eMachined from black anodized aluminum to minimize internal reflections\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\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 M42-M48 Adapter - 16.5mm\u003c\/h2\u003e\n\u003cp\u003eThe ZWO M42-M48 Adapter adds a precise 16.5mm of extension to your imaging train, converting the standard M42x0.75 T-thread to the larger M48x0.75 format used by 2-inch filters and many flatteners and reducers. This specific length is a critical component for achieving the standard 55mm back focus with ZWO cooled cameras in imaging trains without an off-axis guider.\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\u003eAchieve 55mm Back Focus with ZWO Components\u003c\/h3\u003e\n\u003cp\u003eThis 16.5mm adapter is not an arbitrary length; it is specifically engineered to solve a common spacing problem. In an imaging train without an off-axis guider, a ZWO camera with 17.5mm of back focus plus the 21mm T2 extender included with ZWO cooled cameras leaves exactly 16.5mm to reach the 55mm back focus standard required by most field flatteners and coma correctors. This adapter fills that gap perfectly (17.5mm + 21mm + 16.5mm = 55mm).\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\u003eStep Up from 42mm T-Threads to a 48mm Clear Aperture\u003c\/h3\u003e\n\u003cp\u003eConnecting an M42-threaded camera directly to a 2-inch filter wheel or corrector can act as a bottleneck for the light cone, potentially causing vignetting on larger sensors. By converting the M42 thread to the wider M48 format over its 16.5mm length, this adapter ensures the optical path remains as unobstructed as possible, preserving field illumination and image quality from edge to edge.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eM42 Male Interface:\u003c\/strong\u003e Threads into the M42 female T-thread on ZWO cameras, filter wheels, and other M42 accessories.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM48 Female Interface:\u003c\/strong\u003e Accepts field flatteners, reducers, and other accessories with an M48x0.75 male thread.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable Construction:\u003c\/strong\u003e Machined from a single piece of black anodized aluminum, it provides a rigid, non-reflective connection that prevents flexure and stray light.\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 primary use for the ZWO 16.5mm M42-M48 adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIts primary function is to correctly space a ZWO astronomy camera relative to other accessories to achieve the standard \u003cstrong\u003e55mm back focus\u003c\/strong\u003e. Combined with a camera with 17.5mm of native back focus and the 21mm T2 extender, it provides the remaining \u003cstrong\u003e16.5mm\u003c\/strong\u003e to complete the optical train (17.5mm + 21mm + 16.5mm = 55mm) in setups without an off-axis guider.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this ZWO adapter work with my full-frame camera and reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt is not the right part for a full-frame sensor. The camera side is still an \u003cstrong\u003eM42\u003c\/strong\u003e thread, which limits the clear aperture, so full-frame sensors such as the ASI6200 or ASI2400 would show vignetting. ZWO full-frame cameras use M54 connections instead. For APS-C and smaller sensors, the \u003cstrong\u003eM48\u003c\/strong\u003e female output lets you connect directly to M48 flatteners and reducers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need the 16.5mm length for a ZWO ASI camera with 6.5mm of back focus?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this adapter is intended for cameras with \u003cstrong\u003e17.5mm of back focus\u003c\/strong\u003e. If your ZWO camera has 6.5mm of back focus, you would typically use a different combination of spacers, often including the 11mm T2 ring that comes with the camera, to reach your target back focus distance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this 16.5mm adapter with non-ZWO equipment?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. As long as your components use the standard M42x0.75 (T2) and M48x0.75 threads, this adapter will function perfectly as a \u003cstrong\u003e16.5mm\u003c\/strong\u003e extension and thread converter, regardless of the manufacturer.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the difference between M42 and M48 threads?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eBoth are common standards in astrophotography, but they differ in diameter.\n\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eM42 (T2-thread):\u003c\/strong\u003e 42mm diameter with a 0.75mm thread pitch. It is the long-standing standard on most cameras and 1.25\" accessories.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM48 (Wide-T):\u003c\/strong\u003e 48mm diameter with a 0.75mm thread pitch. It is used for 2-inch filters and accessories to provide a wider, less restrictive clear aperture for larger sensors.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the ZWO M42-M48 adapter threaded for filters?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this adapter itself is not designed to hold filters. It is a spacer and thread converter. The M48 female thread is intended to accept an M48 male accessory, such as a field flattener or reducer.\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-T2-M48-16.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Length\u003c\/td\u003e\n\u003ctd\u003e16.5 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Side Connector\u003c\/td\u003e\n\u003ctd\u003eM42 x 0.75 (T2) Male\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTelescope Side Connector\u003c\/td\u003e\n\u003ctd\u003eM48 x 0.75 Female\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\"\u003e16.5mm M42 to M48 Extension Adapter\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\u003ca href=\"https:\/\/davidastro.com\/pages\/zwo-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eZWO 2-Year Manufacturer Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ZWO","offers":[{"title":"Default Title","offer_id":44967915094301,"sku":"ZWO-T2-M48-16.5","price":25.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/ZWO-t2-M48-16-5mm-Adapter.jpg?v=1742409006"},{"product_id":"zwo-m54-adapter-replacing-efw","title":"ZWO M54 Adapter replacing EFW","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eReplaces the ZWO EFW to achieve 55mm back focus with the OAG-L\u003c\/li\u003e\n\u003cli\u003eAdds only 15 mm of optical length to the imaging train\u003c\/li\u003e\n\u003cli\u003eFeatures an internal thread for a single 2-inch mounted filter\u003c\/li\u003e\n\u003cli\u003eProvides rigid M54 connections and includes an M54 to M48 adapter\u003c\/li\u003e\n\u003cli\u003e70 mm diameter body matches ZWO cooled 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 M54 ASI Cooled Camera Adapter for OAG-L - 70 mm Diameter\u003c\/h2\u003e\n\u003cp\u003eThe ZWO M54 ASI Cooled Camera Adapter is the definitive solution for integrating the ZWO OAG-L into your imaging train without a filter wheel, adding just 15 mm of optical path to achieve a precise 55mm back focus. This 70 mm diameter adapter provides a rigid M54 connection directly to your ZWO cooled camera and includes an M54 to M48 adapter for broad compatibility with common correctors. It also features an internal thread, allowing you to mount a single 2-inch filter for streamlined one-shot-color imaging.\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\u003eAchieve 55mm Back Focus with the OAG-L\u003c\/h3\u003e\n\u003cp\u003eThis adapter solves a common spacing challenge for astrophotographers using the ZWO OAG-L. Instead of coupling the OAG-L with a 20 mm thick electronic filter wheel (EFW), this adapter, together with a 5 mm sensor tilt adapter, provides the correct spacing needed to hit the standard 55 mm back focus required by most field flatteners and coma correctors. It creates a lighter, simpler, and more rigid connection for imagers who don't need the complexity of a full filter wheel, particularly those using one-shot-color (OSC) cameras.\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\u003eIntegrated Holder for a Single 2-inch Filter\u003c\/h3\u003e\n\u003cp\u003eMore than just a spacer, this adapter is machined with internal threads to accept a single 2-inch mounted filter. This is the ideal setup for OSC imagers who need to use one primary filter (such as a UV\/IR Cut, a dual-band, or a light pollution filter) without the weight, cost, and power requirements of an EFW. The adapter securely holds the filter in the light path, maintaining rigidity and preventing tilt.\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\u003eRigid 70mm Body with M54 and M48 Threads\u003c\/h3\u003e\n\u003cp\u003eEngineered for a perfect fit, the adapter's 70 mm diameter body matches the profile of ZWO's cooled cameras, ensuring a solid, seamless connection. It features M54 female threads on both sides for direct attachment to the OAG-L and camera. For maximum flexibility, ZWO includes an M54 male to M48 female adapter, allowing you to connect your imaging train to the widely used M48 standard on flatteners and reducers.\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 does the ZWO D70-M54F adapter help achieve 55mm back focus?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis adapter is designed to be used with the ZWO OAG-L. It has an optical path of \u003cstrong\u003e15 mm\u003c\/strong\u003e. When combined with the OAG-L, a 5 mm sensor tilt adapter and a ZWO cooled camera's native back focus, it correctly sets the total distance to the \u003cstrong\u003e55 mm\u003c\/strong\u003e required by most telescope correctors. It effectively replaces the 20 mm ZWO EFW in the imaging train for setups that do not require a filter wheel.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use filters with this ZWO M54 adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The adapter features internal threads designed to hold one standard \u003cstrong\u003e2-inch mounted filter\u003c\/strong\u003e. This is perfect for using a single light pollution, narrowband, or UV\/IR cut filter with a one-shot-color camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy would I use the ZWO D70-M54F adapter instead of a ZWO EFW?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis adapter is for imagers who want a simpler, lighter, and more rigid setup. If you use a \u003cstrong\u003eone-shot-color camera\u003c\/strong\u003e and only need a single filter, this adapter provides the correct spacing for the OAG-L without the cost, weight, and complexity of a full electronic filter wheel (EFW).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI have a ZWO ASI2600MC camera and an OAG-L. Will this adapter work with my setup?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this is the exact component designed for that scenario. The \u003cstrong\u003e70 mm\u003c\/strong\u003e body of the ZWO D70-M54F adapter matches the ASI2600MC, and with a 5 mm sensor tilt adapter its \u003cstrong\u003e15 mm\u003c\/strong\u003e spacing achieves 55 mm back focus when used between the OAG-L and the camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the purpose of the included M54 to M48 adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe main body of the adapter uses M54 threads. However, many telescope flatteners, reducers, and coma correctors use the more common M48x0.75 (\"2-inch filter\") thread standard. The included \u003cstrong\u003eM54 Male to M48 Female adapter\u003c\/strong\u003e allows you to connect the entire OAG-L and camera assembly to an M48 threaded corrector.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this ZWO adapter work with non-ZWO 2-inch filters?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it is designed to be compatible with standard 2-inch mounted filters from most manufacturers. As long as the filter cell meets the standard M48x0.75 thread and height specifications, it should fit correctly inside the adapter.\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-D70-M54F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Length\u003c\/td\u003e\n\u003ctd\u003e15 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Diameter\u003c\/td\u003e\n\u003ctd\u003e70 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnection (Camera Side)\u003c\/td\u003e\n\u003ctd\u003eM54 Female\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnection (Telescope Side)\u003c\/td\u003e\n\u003ctd\u003eM54 Female\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Compatibility\u003c\/td\u003e\n\u003ctd\u003e1x 2-inch Mounted Filter (M48x0.75)\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 70 mm M54 ASI Cooled Camera Adapter for OAG-L\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\"\u003eM54 Male to M48 Female 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\"\u003eL8 Screws\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 8\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 Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ZWO","offers":[{"title":"Default Title","offer_id":44967993147677,"sku":"ZWO-D70-M54F","price":41.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/ZWO-D70-M54F__63224.1648049713.1280.1280.jpg?v=1684347677"},{"product_id":"zwo-m54-male-to-m42-female-adapter","title":"ZWO M54 Male to M42 Female Adapter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n    \u003cli\u003e\n        Thread Compatibility\n    \u003c\/li\u003e\n    \u003cli\u003e\n        Durable Construction\n    \u003c\/li\u003e\n    \u003cli\u003e\n        Precision Engineering\n    \u003c\/li\u003e\n    \u003cli\u003e\n        Lightweight Design\n    \u003c\/li\u003e\n    \u003cli\u003e\n        Versatile Applications\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\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\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 M54 Male to M42 Female Adapter - Overview\u003c\/h2\u003e\n                    \u003cimg src=\"https:\/\/davidastro.com\/cdn\/shop\/products\/zw-m54-m42-0__51995.1680279836.1280.1280_400x400.jpg?v=1684348754\" alt=\"Astrophotography Product\" class=\"DAV-img-banner\"\u003e\n                    \u003cp\u003e\n                        The ZWO M54 Male to M42 Female Adapter is a practical and versatile accessory designed to connect components with differing thread sizes in your astrophotography setup. It allows for seamless integration of M54 male threads with M42 female threads, ensuring a secure and precise connection for various imaging configurations.\n                    \u003c\/p\u003e\n                \u003c\/div\u003e\n            \u003c\/div\u003e\n\n            \u003c!-- Features Grid --\u003e\n            \u003cdiv class=\"DAV-feature-grid\"\u003e\n                \u003c!-- Feature Box 1 --\u003e\n                \u003cdiv class=\"DAV-feature-box\"\u003e\n                    \u003ch3\u003eThread Compatibility\u003c\/h3\u003e\n                    \u003cp\u003e\n                      Male Thread: M54 x 0.75   \n                      \u003cbr\u003e\n                      Female Thread: M42 x 0.75\n                      \u003cbr\u003e\n                      Provides compatibility between components with these common thread standards, making it ideal for many telescopes, cameras, and accessories.\n                    \u003c\/p\u003e\n                \u003c\/div\u003e\n                \u003c!-- Feature Box 2 --\u003e\n                \u003cdiv class=\"DAV-feature-box\"\u003e\n                    \u003ch3\u003ePrecision Engineering\u003c\/h3\u003e\n                    \u003cp\u003e\n                        Ensures a secure and wobble-free connection for stable imaging setups, critical for astrophotography's long-exposure requirements.\n                    \u003c\/p\u003e\n                \u003c\/div\u003e\n                \u003c!-- Feature Box 3 --\u003e\n                \u003cdiv class=\"DAV-feature-box\"\u003e\n                    \u003ch3\u003eDurable Construction\u003c\/h3\u003e\n                    \u003cp\u003e\n                        Made from premium aluminum alloy with an anodized finish, the adapter is lightweight yet robust, offering excellent durability and corrosion resistance.\n                    \u003c\/p\u003e\n                \u003c\/div\u003e\n\n                \u003c!-- Feature Box 3 --\u003e\n                \u003cdiv class=\"DAV-feature-box\"\u003e\n                    \u003ch3\u003eLightweight and Compact\u003c\/h3\u003e\n                    \u003cp\u003e\n                        Its lightweight design minimizes additional load on your imaging train while maintaining ease of use and portability.\n                    \u003c\/p\u003e\n                \u003c\/div\u003e\n\n                \u003c!-- Feature Box 3 --\u003e\n                \u003cdiv class=\"DAV-feature-box\"\u003e\n                    \u003ch3\u003eVersatile Use\u003c\/h3\u003e\n                    \u003cp\u003e\n                        Perfect for integrating reducers, flatteners, and other optical accessories with cameras or filter wheels, enhancing the adaptability of your setup.\n                    \u003c\/p\u003e\n                \u003c\/div\u003e\n            \u003c\/div\u003e\n\n            \u003c!-- image text --\u003e\n            \u003cdiv class=\"DAV-section-container\"\u003e\n                \u003c!-- Image Section --\u003e\n                \u003cdiv class=\"DAV-section-img\"\u003e\n                    \u003cimg src=\"https:\/\/davidastro.com\/cdn\/shop\/products\/zw-m54-m42-0__51995.1680279836.1280.1280_400x400.jpg?v=1684348754\" alt=\"Why Choose This Product\"\u003e\n                \u003c\/div\u003e\n\n                \u003c!-- Text Section --\u003e\n                \u003cdiv class=\"DAV-section-text\"\u003e\n                    \u003ch3\u003eApplications\u003c\/h3\u003e                \n                    \u003cp\u003e\n                        \u003c\/p\u003e\n\u003cul\u003e\n                            \u003cli\u003e\n\u003cb\u003eConnecting Optical Accessories:\u003c\/b\u003e This adapter bridges the gap between M54 and M42 threaded components, enabling you to combine different accessories without compatibility issues.\u003c\/li\u003e\n                            \u003cli\u003e\n\u003cb\u003eCustom Imaging Trains:\u003c\/b\u003e Build a customized imaging train with components from various manufacturers, ensuring flexibility in your astrophotography equipment.\u003c\/li\u003e\n                            \u003cli\u003e\n\u003cb\u003ePrecise Alignments:\u003c\/b\u003e Achieve secure and stable connections for long exposure astrophotography, ensuring sharp and clear captures of deep-sky objects.\u003c\/li\u003e\n                       \u003c\/ul\u003e   \n                    \n                \u003c\/div\u003e\n            \u003c\/div\u003e\n\n            \u003c!-- image text --\u003e\n            \u003cdiv class=\"DAV-section-container\"\u003e\n                \u003c!-- Text Section --\u003e\n                \u003cdiv class=\"DAV-section-text\"\u003e\n                    \u003ch3\u003eWhy Choose the ZWO M54 Male to M42 Female Adapter?\u003c\/h3\u003e                \n                    \u003cp\u003e\n                        Astrophotographers demand precision and reliability when building imaging setups. The ZWO M54 Male to M42 Female Adapter delivers both, making it an essential accessory for connecting components with different thread sizes. Its durable construction and precision design provide peace of mind for professional and amateur astrophotographers alike.                        \u003cbr\u003e\n                        \u003cbr\u003e\n                        Streamline your astrophotography setup with the ZWO M54 Male to M42 Female Adapter. It bridges thread compatibility issues effortlessly, ensuring that your imaging train works seamlessly.\n                        \u003cbr\u003e    \n                        Choose the ZWO M54 Male to M42 Female Adapter for reliable connections and enhanced versatility in your celestial imaging endeavors.\n                    \u003c\/p\u003e            \n                \u003c\/div\u003e\n                \u003c!-- Image Section --\u003e\n                \u003cdiv class=\"DAV-section-img\"\u003e\n                    \u003cimg src=\"https:\/\/davidastro.com\/cdn\/shop\/products\/zw-m54-m42-0__51995.1680279836.1280.1280_400x400.jpg?v=1684348754\" alt=\"Why Choose This Product\"\u003e\n                \u003c\/div\u003e\n            \u003c\/div\u003e\n\n        \u003c\/div\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:\/\/davidastro.com\/cdn\/shop\/products\/zw-m54-m42-0__51995.1680279836.1280.1280_400x400.jpg?v=1684348754\" alt=\"Item 1\" class=\"DAV-img-box\"\u003e\n                \u003cdiv\u003e\n                    \u003cp class=\"DAV-item-title\"\u003eZWO M54 Male to M42 Female Adapter\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\u003c\/ul\u003e","brand":"ZWO","offers":[{"title":"Default Title","offer_id":44968076378397,"sku":"ZWO-M54M-M42F-0","price":22.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/zw-m54-m42-0__51995.1680279836.1280.1280.jpg?v=1684348754"},{"product_id":"zwo-m42-to-m48-extension-22-5mm","title":"ZWO M42e to M48i Extension - 22.5mm","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eEstablishes precise 55mm back focus with specific ZWO camera\/filter wheel combinations\u003c\/li\u003e\n\u003cli\u003eProvides exactly 22.5 mm of optical path length\u003c\/li\u003e\n\u003cli\u003eConnects M42 accessories to M48 telescope-side components\u003c\/li\u003e\n\u003cli\u003eMale M42x0.75 threads on one side\u003c\/li\u003e\n\u003cli\u003eFemale M48x0.75 threads on the other side\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 22.5mm M42 to M48 Extender\u003c\/h2\u003e\n\u003cp\u003eThe ZWO 22.5mm M42 Male to M48 Female Extender is a purpose-built adapter designed to achieve the standard 55mm back focus when connecting a ZWO ASI2600MM Pro camera to a 7x36mm ZWO Electronic Filter Wheel. This adapter's precise 22.5mm length bridges the exact spacing gap required in this popular imaging train. It converts the EFW's M42 thread to the common M48 thread used by most correctors, simplifying your connection chain.\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 55mm Back Focus Solution for the ASI2600MM\u003c\/h3\u003e\n\u003cp\u003eThis 22.5mm extender is the key component for building a compact, rigid imaging train with the ASI2600MM Pro and 36mm EFW. By using this adapter, you can reach the critical 55mm back focus distance without needing to add a ZWO Off-Axis Guider into the optical path. This creates a shorter, lighter setup ideal for portable rigs or mounts where moment arm is a concern.\u003c\/p\u003e\n\u003cul\u003e\n \u003cli\u003e\n\u003cstrong\u003eOptimized Spacing:\u003c\/strong\u003e Provides the exact 22.5mm needed for the ASI2600MM and 7x36mm EFW combination to total 55mm of back focus.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eStreamlined Imaging Train:\u003c\/strong\u003e Eliminates the need for an OAG-L in this specific configuration, reducing complexity and weight.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eRigid Connection:\u003c\/strong\u003e A single, solid adapter prevents flexure better than a stack of multiple thin spacers.\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\u003eM42 and M48 Threads with ASI2600MM Installation\u003c\/h3\u003e\n\u003cp\u003eThe adapter features male M42x0.75 threads on one side that connect directly to the ZWO EFW. The opposite side has female M48x0.75 threads, ready to attach to your telescope's field flattener or reducer. For proper installation with the ASI2600MM camera, the camera's sensor tilt plate must first be unscrewed and removed; the filter wheel is then attached directly to the camera using the same screws and the extender threads onto the filter wheel, shortening the filter-to-sensor distance as required.\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 primary purpose of the ZWO 22.5mm M42-M48 extender?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis extender is specifically designed to set the correct \u003cstrong\u003e55mm back focus distance\u003c\/strong\u003e when pairing a ZWO ASI2600MM Pro camera with a ZWO 7x36mm Electronic Filter Wheel (EFW). It provides the exact 22.5mm of spacing needed for this combination.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I install the ZWO 22.5mm extender with an ASI2600MM Pro?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eTo achieve the correct spacing, you must first \u003cstrong\u003eunscrew and remove the sensor tilt plate\u003c\/strong\u003e from the front of the ASI2600MM Pro camera body. You then use the screws from the tilt plate to attach the filter wheel directly to the camera, and thread this 22.5mm extender onto the telescope side of the filter wheel.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the ZWO OAG-L with this 22.5mm extender?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. This 22.5mm extender is designed as an alternative to achieve 55mm of back focus in configurations \u003cstrong\u003ewithout an Off-Axis Guider\u003c\/strong\u003e. If you need to use an OAG-L, you will need a different combination of spacers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat are the thread types on the ZWO 22.5mm extender?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe extender has \u003cstrong\u003emale M42x0.75 threads\u003c\/strong\u003e on the side that connects to the filter wheel and \u003cstrong\u003efemale M48x0.75 threads\u003c\/strong\u003e on the side that connects to the telescope's corrector or flattener.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the ZWO 22.5mm extender work with my telescope's M48 corrector?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The female M48 threads on this extender are the standard \"wide T-thread\" size used by most 2-inch field flatteners, reducers, and coma correctors, ensuring a direct and secure connection.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this 22.5mm extender for other cameras or spacing needs?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile designed for the ASI2600MM Pro, it can be used in any imaging train where you need exactly \u003cstrong\u003e22.5mm of spacing\u003c\/strong\u003e and need to adapt a male M42 thread to a female M48 thread. Always verify your own back focus calculations before using it in other configurations.\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-M42-M48-22.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera-Side Thread\u003c\/td\u003e\n\u003ctd\u003eM42 x 0.75 Male\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTelescope-Side Thread\u003c\/td\u003e\n\u003ctd\u003eM48 x 0.75 Female\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Length\u003c\/td\u003e\n\u003ctd\u003e22.5 mm\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\"\u003e22.5 mm M42 Male to M48 Female Extender\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":47390892720413,"sku":"ZWO-M42-M48-22.5","price":35.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/image_2474b127-8aeb-4a87-94f3-5f7ba0b592f1.jpg?v=1704381617"},{"product_id":"zwo-sony-e-adapter-for-asi-cameras","title":"ZWO Sony E Adapter for ASI Cameras","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConnects Sony NEX (E-mount) lenses to ZWO ASI cameras\u003c\/li\u003e\n\u003cli\u003eStandard M42x0.75 female thread for direct camera attachment\u003c\/li\u003e\n\u003cli\u003eEnables wide-field astrophotography with camera lenses\u003c\/li\u003e\n\u003cli\u003eCompatible with popular small-sensor cameras like the ASI1600 and ASI294\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 Sony E-mount Adapter for ASI Cameras\u003c\/h2\u003e\n\u003cp\u003eThe ZWO Sony E-mount Adapter connects your high-quality Sony NEX lenses directly to ZWO's most sensitive astronomy cameras, including the ASI1600, ASI294, ASI183, and ASI533 models. This adapter attaches securely to the camera's M42x0.75 female thread, creating a rigid, lightweight imaging train for capturing vast nebulae and dense star fields. With a 2-year warranty, it's the definitive link between your existing photographic lenses and the night sky.\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\u003eM42x0.75 Thread for a Secure Connection\u003c\/h3\u003e\n\u003cp\u003eThis adapter isn't a generic converter; it's a purpose-built link between two specific systems. The male Sony E-mount (NEX) bayonet provides a positive lock to your lens, while the female M42x0.75 T-thread screws directly onto the housing of compatible ZWO cameras. This direct-thread connection eliminates the flexure and tilt that can plague more complex adapter chains, ensuring your sensor remains perfectly parallel to the focal plane of your lens.\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\u003eUnlock Wide-Field Imaging with Your Camera Lenses\u003c\/h3\u003e\n\u003cp\u003eWhile telescopes excel at high magnification, many of the sky's largest and most impressive targets, like the Andromeda Galaxy (M31) or the Rho Ophiuchi Cloud Complex, are too large to fit in their field of view. By pairing your ZWO camera with a wide-angle or telephoto Sony lens, you can create a fast, portable instrument perfectly suited for these expansive celestial landscapes. This adapter makes that combination possible, turning your existing camera gear into a dedicated astrophotography system.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast Optics:\u003c\/strong\u003e Use fast f\/1.8 or f\/2.8 lenses to capture significant signal in a fraction of the time required by a typical f\/7 refractor.\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePortability:\u003c\/strong\u003e An ASI camera and a 135mm lens weigh significantly less than a telescope, making this an ideal setup for travel or grab-and-go imaging.\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMechanical Simplicity:\u003c\/strong\u003e This is a fully manual adapter. There is no electronic control of focus or aperture, a deliberate trade-off for mechanical rigidity and reliability in the field.\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\u003eCompatibility with 6+ ZWO Small-Sensor Cameras\u003c\/h3\u003e\n\u003cp\u003eThe ZWO Sony E-mount Adapter is engineered to achieve correct focus with a range of ZWO's most popular cameras. It is confirmed to work with the ASI1600, ASI294, ASI183, ASI533, ASI174, ASI432, and ASI585 series. This broad compatibility means a single adapter can serve multiple cameras in your collection, from deep-sky monochrome imagers to high-frame-rate planetary cameras used for wide-field video.\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\"\u003eWhich ZWO cameras are compatible with the Sony E-mount Adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis adapter is designed for ZWO's small-sensor cameras that use a standard M42x0.75 T-thread interface. It is officially compatible with the \u003cstrong\u003eASI1600, ASI294, ASI183, ASI533, ASI174, ASI432, and ASI585\u003c\/strong\u003e camera series.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the ZWO Sony E-mount Adapter allow for autofocus or aperture control?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. This is a purely mechanical adapter with no electronic contacts. You must set the lens aperture manually (ideally using a lens with a physical aperture ring) and achieve focus manually using your imaging software's focus aids. This design prioritizes a rigid, reliable connection over electronic features.\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 Orion Nebula (M42)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eTo image the Orion Nebula (M42) with the ZWO Sony E-mount Adapter, you would attach a telephoto lens (e.g., 135mm or 200mm) to the adapter, and then thread the adapter onto your ASI camera like the ASI183MC Pro. Mount this setup on a star tracker or equatorial mount. The wide field of view will allow you to frame the entire nebula, including the surrounding dust clouds and the Running Man Nebula, in a single shot.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this adapter work with a full-frame Sony lens and my ASI1600 camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. You can use a full-frame Sony E-mount lens with this adapter and an ASI1600 (a Micro Four Thirds sensor). The camera will simply use the sharpest central portion of the lens's image circle, effectively \"cropping\" the view. This often results in excellent performance, as you are not using the extreme edges of the lens where optical aberrations can be more prominent.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the thread type on the camera side of the ZWO Sony E-mount Adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe adapter features a female \u003cstrong\u003eM42x0.75\u003c\/strong\u003e thread, commonly known as a T-thread or T2-thread in astronomy. This allows it to screw directly onto the male threads on the front of compatible ZWO cameras.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need any additional spacers or extenders with this adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The adapter is designed to place the camera sensor at the correct distance from the lens flange to achieve infinity focus without any additional parts. Simply connect your lens to the adapter and screw the adapter directly onto the camera body of compatible cameras with sensors smaller than APS-C, such as the ASI533MC and ASI585MC.\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-SONY-NEX\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Mount\u003c\/td\u003e\n\u003ctd\u003eSony NEX (E-mount)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Connection\u003c\/td\u003e\n\u003ctd\u003eM42x0.75 Female Thread (T\/T2)\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 Sony NEX Lens to ASI Small-Sensor Camera Adapter\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":48681400828189,"sku":"ZWO-Sony-NEX","price":49.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/99568c93f79821c97e738c7c516fd988.jpg?v=1718815368"},{"product_id":"zwo-m42-plate-for-caa-rotator","title":"ZWO M42 Plate for CAA Rotator","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConverts ZWO CAA Rotator to M42 T-Threads\u003c\/li\u003e\n\u003cli\u003eMaintains 55mm Backfocus Standard\u003c\/li\u003e\n\u003cli\u003eZero-Profile Design Adds No Optical Path Length\u003c\/li\u003e\n\u003cli\u003eIdeal for ASI533, ASI2600, and Other M42-Thread 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\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 M42 Plate for CAA Rotator\u003c\/h2\u003e\n\u003cp\u003eThe ZWO CAA M42 Adapter Plate directly converts the native M48 or M54 thread of the ZWO Camera Angle Adjuster (CAA) to a male M42x0.75 T-thread. This zero-profile plate replaces the rotator's stock adapter, enabling a direct connection to M42-threaded cameras and accessories while preserving the critical 55mm backfocus distance required by most imaging systems.\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\u003eAchieve Precise 55mm Backfocus with M42 Cameras\u003c\/h3\u003e\n\u003cp\u003eFor imagers using popular cameras like the ASI533 or ASI2600 series, which often rely on M42 spacers to achieve the standard 55mm backfocus, this adapter is essential. Instead of stacking multiple M48-to-M42 step-down rings that add unwanted length and potential tilt, this plate creates a single, rigid M42 connection point on the CAA itself. The result is a mechanically simpler and more stable imaging train that meets the 55mm specification without compromise.\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 6-Screw Installation\u003c\/h3\u003e\n\u003cp\u003eSwapping the adapter plate on your ZWO CAA is a straightforward mechanical task. The plate installs using the same six mounting screws as the original M48\/M54 plate, ensuring perfect alignment and a secure fit.\n\u003c\/p\u003e\n\u003cul\u003e\n \u003cli\u003e\n\u003cstrong\u003eRemove Stock Plate:\u003c\/strong\u003e Use the hex wrench included with your ZWO CAA to undo the six screws holding the existing adapter plate.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eInstall M42 Plate:\u003c\/strong\u003e Place the CAA M42 Adapter Plate onto the rotator body, aligning the six screw holes.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eSecure and Image:\u003c\/strong\u003e Reinstall the six screws to lock the plate in place. Your CAA is now fully configured for any M42-threaded camera or accessory.\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\"\u003eDoes the ZWO CAA M42 Adapter Plate add any backfocus to my imaging train?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The ZWO CAA M42 Adapter Plate is a zero-profile replacement for the stock plate on the ZWO Camera Angle Adjuster. It does not add any optical path length, ensuring you can maintain the standard 55mm backfocus when connecting M42 cameras and accessories.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy use this M42 plate instead of a standard M48-to-M42 step-down ring?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA standard step-down ring adds at least 1-2mm of backfocus, which can prevent your optical train from reaching the required 55mm distance. This plate replaces the stock M48\/M54 plate on the CAA, providing a native M42 connection with zero added length, which is the mechanically simplest and most precise solution.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs this adapter compatible with the ZWO ASI533MC Pro camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this is the ideal adapter for using a ZWO ASI533MC Pro or ASI533MM Pro with the ZWO CAA. Since those cameras use M42 threads, this plate allows you to connect the camera directly to the rotator as part of a standard 55mm backfocus configuration.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this M42 plate work with any brand of camera rotator?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this adapter plate is designed specifically for the ZWO Camera Angle Adjuster (CAA). It uses a proprietary 6-screw mounting pattern and is not compatible with rotators from other manufacturers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat tools are needed to install the ZWO CAA M42 plate?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eInstallation requires the small hex wrench that was originally included with your ZWO CAA rotator. No other tools are necessary.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the ZWO CAA M42 plate with an Off-Axis Guider (OAG)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. If your imaging train is configured for 55mm of backfocus and includes an M42-threaded OAG, this plate allows you to place the ZWO CAA rotator in front of the OAG without altering the required spacing.\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-CAA-PLATE-M42\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Thread\u003c\/td\u003e\n\u003ctd\u003eM42x0.75 Male (T2-Thread)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eZWO Camera Angle Adjuster (CAA)\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 CAA M42 Adapter Plate\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\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":50033434493213,"sku":"ZWO-CAA-PLATE-M42","price":41.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/ZWO-CAA-PLATE-M42.jpg?v=1748971994"},{"product_id":"zwo-m54-m48-adapter","title":"ZWO M54-M48 Adapter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eM54 male threads on one side, M48 female threads on the other\u003c\/li\u003e\n\u003cli\u003eZero-profile design preserves critical back focus\u003c\/li\u003e\n\u003cli\u003eConverts larger M54 ports to the common M48 standard\u003c\/li\u003e\n\u003cli\u003eBlack anodized aluminum construction\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 M54 to M48 Adapter\u003c\/h2\u003e\n\u003cp\u003eThe ZWO M54 to M48 Adapter provides a direct, zero-length conversion from the M54 thread standard to the widely used M48 format. This adapter features M54 male threads on one side and M48 female threads on the other, allowing you to connect M48 accessories directly without altering your back focus distance. This component is covered by a ZWO 2-year warranty.\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 Zero-Profile M54 to M48 Connection\u003c\/h3\u003e\n\u003cp\u003eThis adapter is engineered to solve a common connection problem without introducing new ones. By stepping M54 threads down to M48 with no flange or added optical length, it ensures your carefully calculated back focus remains unchanged. This is critical when connecting correctors, flatteners, or filter wheels where every millimeter of spacing counts for maintaining a flat field and sharp stars edge-to-edge.\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\u003eIntegrating M48 Accessories into Larger Imaging Trains\u003c\/h3\u003e\n\u003cp\u003eMany modern focusers and full-frame cameras utilize a larger M54 connection to prevent vignetting. However, the vast majority of flatteners, reducers, and filter wheels are standardized on the M48 (2-inch filter) thread. This black-anodized adapter bridges that gap, allowing you to securely integrate your existing M48 accessories into a larger-format imaging train without compromising mechanical rigidity or optical spacing.\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 primary use for the ZWO M54 to M48 Adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIts primary use is to connect an accessory with male M48 threads, such as a 2\" filter wheel or field flattener, to a camera, focuser, or corrector that has female M54 threads. It adapts the thread size without adding any length to the optical path.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the ZWO M54 to M48 Adapter affect back focus?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt has \u003cstrong\u003ezero effect on back focus\u003c\/strong\u003e. The adapter is designed without a flange or shoulder, meaning it does not add any optical path length. Your back focus distance is preserved exactly as if the two connected components had matching native threads.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this ZWO adapter to attach a ZWO EFW with M48 threads to an ASI camera with an M54 tilt plate?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this is an ideal scenario for this adapter. It allows a direct, rigid, and spacing-neutral connection between a camera's M54 interface and an M48-threaded accessory like a ZWO electronic filter wheel (EFW).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy use this ZWO M54 to M48 adapter instead of a generic M54 to T2 adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eM48 threads (often called \"Wide T\") have a larger clear aperture than standard T2 (M42) threads. Using this adapter maintains the larger M48 light path, which is crucial for preventing vignetting on full-frame or large APS-C sensors. A T2 adapter would create a bottleneck in the light path.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the physical length of the ZWO M54-M48 adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile it has a physical length, its \u003cstrong\u003eoptical length is zero\u003c\/strong\u003e. The design ensures that when you thread an M48 accessory into it, the shoulder of that accessory meets the shoulder of the M54 component, exactly as if they were connected directly. This prevents any change in critical back focus spacing.\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-M54-M48\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnector Side A\u003c\/td\u003e\n\u003ctd\u003eM54 Male\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnector Side B\u003c\/td\u003e\n\u003ctd\u003eM48 Female (Wide T)\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 M54 Male to M48 Female Adapter\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 Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ZWO","offers":[{"title":"Default Title","offer_id":50045835968797,"sku":"ZWO-M54-M48","price":17.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/ZWO-M54-M48-1.jpg?v=1749238780"},{"product_id":"zwo-m54-extension-16-5mm","title":"ZWO M54 Extension - 16.5mm","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eOptical Length: 16.5mm\u003c\/li\u003e\n\u003cli\u003eConnection Side 1: M54x0.75 Male Thread\u003c\/li\u003e\n\u003cli\u003eConnection Side 2: M54x0.75 Female Thread\u003c\/li\u003e\n\u003cli\u003eMaterial: Anodized Aluminum\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\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\u003ePrecision Back Focus for ZWO Full-Frame Systems: The M54 Extension 16.5mm\u003c\/h2\u003e\n\u003cp\u003eThe ZWO M54 Extension 16.5mm tube is a purpose-built spacer designed to solve one of the most critical steps in astrophotography: achieving the standard 55mm back focus distance for full-frame ZWO imaging systems. This is not just a generic spacer. It is the specific component designed to sit between a ZWO 2” Filter Wheel (M54) and your telescope or corrector in a train built around a full-frame camera like the ASI6200 or ASI2400, completing the optical train with mechanical rigidity and precise spacing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-section-container\"\u003e\n\u003cdiv class=\"DAV-section-img\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/ZWO-M54-Cameras-55mm-Backfocus.jpg?v=1778870039\" alt=\"Diagram showing the ZWO M54 16.5mm Extension in a 55mm back focus imaging train.\"\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-section-text\"\u003e\n\u003ch3\u003eAchieve the Critical 55mm Back Focus Distance\u003c\/h3\u003e\n\u003cp\u003eMost field flatteners and coma correctors require a sensor distance of exactly 55mm to deliver sharp stars across the frame. The ZWO M54 Extension 16.5mm is a key part of the ZWO system solution. When combined with a ZWO full-frame camera (17.5mm back focus) and a ZWO 21mm M54 spacer, this 16.5mm extension provides the final piece, summing to a perfect 55mm. \u003c\/p\u003e\n\u003cp\u003eThis precision eliminates the need for stacking multiple, less-stable adapters. By using a single, solid spacer, you reduce the potential for optical tilt that can ruin an otherwise perfect image, especially with the demanding tolerances of large, full-frame sensors. It simplifies your setup and provides a reliable, repeatable connection every time you assemble your gear.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-section-container\"\u003e\n\u003cdiv class=\"DAV-section-text\"\u003e\n\u003ch3\u003eSecure M54 Threading for Full-Frame Payloads\u003c\/h3\u003e\n\u003cp\u003eThe ZWO M54 Extension uses M54x0.75 threads on both its male and female ends. This larger diameter provides a more rigid and stable connection than the older M48 standard, which is critical when supporting the weight of a filter wheel and a heavy, cooled full-frame camera. The wider aperture also helps prevent vignetting on large sensors, ensuring the light cone from the corrector reaches the entire sensor without being clipped.\u003c\/p\u003e\n\u003cp\u003eThe male M54 thread connects directly to the filter wheel or camera tilt adapter, while the female side connects to your corrector or off-axis guider. This creates a seamless, all-ZWO train where every component is designed to work together mechanically, preserving the integrity of your optical alignment throughout a long imaging session.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-section-img\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/ZWOM54-M54-16.5.jpg?v=1768507530\" alt=\"Close-up of the M54 threads on a ZWO adapter.\"\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eInternal Light Baffling for Maximum Contrast\u003c\/h3\u003e\n\u003cp\u003eThe interior of the extension tube is machined with a matte-black, anodized finish. This surface treatment is designed to absorb stray light that might otherwise reflect off internal surfaces and reduce image contrast. While a small component, its contribution to a clean final image is significant, preventing faint, off-axis light from scattering and washing out the delicate details in nebulae and galaxies.\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 Note on System Compatibility\u003c\/h3\u003e\n\u003cp\u003eThis extension is engineered as part of the ZWO ecosystem for achieving 55mm back focus. Its 16.5mm length is highly specific to the optical path lengths of ZWO's own cameras and filter wheels. If you are using components from other manufacturers, you must measure your required spacing carefully, as this part may not be the correct length for a mixed-brand imaging train. It represents a trade-off: perfect integration within the ZWO system in exchange for less universal applicability.\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\u003eLightweight and Durable Construction\u003c\/h3\u003e\n\u003cp\u003eMachined from aircraft-grade aluminum, the adapter adds minimal weight to the imaging train. This helps reduce the overall load on your focuser and mount, which is always a consideration with heavy full-frame systems. \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\"\u003eWhich ZWO cameras need the 16.5mm M54 extension for 55mm back focus?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis spacer is designed for ZWO full-frame cameras like the ASI6200 and ASI2400 when used with the ZWO 2\" EFW (20mm path length). The camera's 17.5mm sensor depth plus the 20mm EFW and this 16.5mm spacer (placed between the EFW and your corrector) totals 54mm, so about 1mm of additional spacing is needed to reach the 55mm standard.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs this the right spacer if I don't use a filter wheel?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, as part of a pair. If you connect a ZWO full-frame camera (17.5mm back focus) directly to your corrector, combining this 16.5mm extension with a 21mm M54 extension gives 17.5mm + 21mm + 16.5mm = 55mm.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this M54 extension cause vignetting?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, the M54 diameter is large enough to pass the full light cone from a 2-inch corrector to a full-frame sensor without clipping the edges. It is the preferred standard over M48 for full-frame imaging to prevent vignetting.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this adapter with non-ZWO cameras or filter wheels?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou can, but only if the total optical path length of your components requires exactly 16.5mm of spacing. You must calculate your back focus needs precisely, as this adapter is not a universal solution and is optimized for the ZWO ecosystem.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the ZWO M54 Extension 16.5mm add any tilt?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAs a single, solid-machined component, it is designed to minimize tilt. Using one 16.5mm extension is mechanically more stable and less prone to tilt than stacking multiple smaller spacers to achieve the same distance.\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\u003eProduct Code\u003c\/td\u003e\n\u003ctd\u003eM54-M54-16.5L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Length\u003c\/td\u003e\n\u003ctd\u003e16.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMale Thread\u003c\/td\u003e\n\u003ctd\u003eM54x0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFemale Thread\u003c\/td\u003e\n\u003ctd\u003eM54x0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eAluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinish\u003c\/td\u003e\n\u003ctd\u003eMatte Black Anodized\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\u003cimg class=\"DAV-img-box\" alt=\"ZWO M54 Extension - 16.5mm\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/ZWOM54-M54-16.5.jpg?v=1768507530\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eZWO M54 to M54 Extension Tube (16.5mm)\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\u003ca href=\"https:\/\/davidastro.com\/pages\/zwo-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eZWO 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ZWO","offers":[{"title":"Default Title","offer_id":50843662188829,"sku":"ZWO-M54-M54-16.5","price":25.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/ZWOM54-M54-16.5.jpg?v=1768507530"},{"product_id":"zwo-m54-extension-21mm","title":"ZWO M54 Extension - 21mm","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eAdds precisely 21mm of optical path length\u003c\/li\u003e\n\u003cli\u003eM54x0.75 male and female threads for secure connections\u003c\/li\u003e\n\u003cli\u003ePrevents vignetting with full-frame sensors\u003c\/li\u003e\n\u003cli\u003eMachined from black anodized aluminum to reduce reflections\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\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\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 M54 Extension - 21mm\u003c\/h2\u003e\n      \u003cp\u003eThe ZWO M54 Extension Tube adds exactly 21mm of optical path length, providing a critical spacing solution for achieving perfect 55mm back focus with full-frame cameras. Machined from a single piece of black anodized aluminum, this 21mm extender ensures a rigid, tilt-free connection in your M54 imaging train, preventing flexure that can compromise edge-of-field star shapes.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eAchieve 55mm Back Focus with Full-Frame Cameras\u003c\/h3\u003e\n      \u003cp\u003eMost field flatteners and coma correctors require a precise sensor distance of 55mm to deliver sharp stars across the frame. This 21mm extension is a key component in the ZWO ecosystem for reaching that standard. When combined with a ZWO full-frame camera (which typically has 17.5mm of back focus) and a ZWO 16.5mm extension, this 21mm piece completes the 55mm requirement without stacking multiple, less stable adapters.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eSecure M54 Threading for Large-Sensor Payloads\u003c\/h3\u003e\n      \u003cp\u003eThe ZWO 21mm Extension uses M54x0.75 threads on both its male and female ends. This large-diameter connection provides a more rigid and stable optical train than the older M48 standard, which is critical when supporting the weight of a filter wheel and a heavy, cooled camera. The wider M54 aperture also prevents vignetting on large sensors, ensuring the corrected light cone from your optics reaches the entire sensor without being clipped at the edges.\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eSolid, Single-Piece Construction:\u003c\/strong\u003e Eliminates the potential for optical tilt that can occur when stacking multiple shorter, thinner adapters to achieve the same distance.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eInternal Matte-Black Finish:\u003c\/strong\u003e The interior of the extension tube is anodized and baffled to absorb stray light, preventing internal reflections from reducing image contrast.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eSeamless Integration:\u003c\/strong\u003e Designed to thread directly and securely onto other ZWO M54 components like filter wheels, off-axis guiders, and camera tilt adapters for a reliable, repeatable setup.\u003c\/li\u003e\n      \u003c\/ul\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhy do I need the ZWO M54 21mm Extension?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYou need this 21mm extension to achieve the standard \u003cstrong\u003e55mm back focus\u003c\/strong\u003e required by most flatteners and correctors, especially when using a ZWO full-frame camera. It provides a precise, solid spacer that prevents optical tilt and ensures sharp stars across your entire image.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow does this 21mm extension fit into a standard ZWO full-frame imaging train?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eA typical ZWO full-frame setup to achieve 55mm back focus consists of the camera's native 17.5mm back focus, a 16.5mm M54 extension, and this 21mm M54 extension. The total (17.5mm + 16.5mm + 21mm) equals 55mm, the ideal distance for most optical correctors.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWill the ZWO M54 21mm extension cause vignetting with my full-frame camera?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eNo. The M54 thread standard has a larger diameter than M48, specifically to accommodate the light cone required by full-frame (36mm x 24mm) sensors. This 21mm extension maintains that clear aperture, preventing the clipping of light that can cause vignetting.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIs the ZWO M54 21mm extension made of plastic or metal?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe ZWO M54 21mm Extension is precision CNC-machined from a single piece of \u003cstrong\u003eaircraft-grade aluminum\u003c\/strong\u003e. It is then black anodized to increase durability and minimize internal reflections.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I thread a 2-inch filter into this ZWO 21mm extension?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThis specific M54-to-M54 extension does not have filter threads. ZWO produces other adapters, often with an M54-to-M48 conversion, that are designed to accept 2-inch (M48x0.75) filters. This piece is designed purely for adding 21mm of spacing while maintaining a robust M54 connection.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003ctable class=\"DAV-specifications\"\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003ctd\u003eOptical Length\u003c\/td\u003e\n\u003ctd\u003e21mm\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMale Thread\u003c\/td\u003e\n\u003ctd\u003eM54x0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eFemale Thread\u003c\/td\u003e\n\u003ctd\u003eM54x0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eAluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eFinish\u003c\/td\u003e\n\u003ctd\u003eBlack Anodized\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/li\u003e\n\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 21mm M54 to M54 Extension Tube\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\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/zwo-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eZWO 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ZWO","offers":[{"title":"Default Title","offer_id":50843678540061,"sku":"ZWO-M54-M54-21","price":25.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/ZWOM54-M54-21.jpg?v=1768507587"}],"url":"https:\/\/davidastro.com\/en-us\/collections\/zwo-adapters.oembed","provider":"David Astro","version":"1.0","type":"link"}