{"title":"William Optics Adapters","description":"\u003cp\u003eWilliam Optics adapters connect cameras, correctors and visual accessories to William Optics refractors and other telescopes. Camera adapters include 48mm T-mounts for Nikon Z, Fuji FX and Micro 4\/3, and a high precision copper T-mount for full-frame Canon EOS bodies.\u003c\/p\u003e\u003cp\u003eFor the imaging train there are flattener adapters and extenders, a 4\" extension tube for the FLT series, M48 to M42 adapters and an M48 push-in nosepiece. RotoLock visual backs cover 1.25\", 2\" and SCT connections.\u003c\/p\u003e","products":[{"product_id":"william-optics-flat4-draw-tube-adapter-for-gt102-flt-132-black-for-3-v-power-focuser","title":"William Optics Flat4 Draw Tube Adapter for GT102, FLT 132 - Black for 3\" V-Power Focuser","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConnects William Optics Flat4 Flattener to Draw Tube\u003c\/li\u003e\n\u003cli\u003eDesigned for the 3\" V-Power Focuser\u003c\/li\u003e\n\u003cli\u003eCompatible with GT102 \u0026amp; FLT 132 (2017 Models)\u003c\/li\u003e\n\u003cli\u003eEnsures a Secure, Threaded Imaging Train\u003c\/li\u003e\n\u003cli\u003eColor: Black\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\u003eWilliam Optics Flat4 Draw Tube Adapter for GT102, FLT 132 - Black for 3\" V-Power Focuser\u003c\/h2\u003e\n\u003cp\u003eThis William Optics Flat4 Draw Tube Adapter provides the essential mechanical link for attaching your Flat4 flattener to the 3\" V-Power focuser on Gran Turismo 102 and FLT 132 refractors from the 2017 model year.\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\u003eDedicated Adapter for Flat4 on 3\" V-Power Focusers\u003c\/h3\u003e\n\u003cp\u003eAchieve a rigid, secure connection for your astrophotography setup. This adapter is purpose-built to join the William Optics Flat4 field flattener directly to the draw tube of specific telescopes, eliminating potential flexure or misalignment that can occur with generic solutions.\u003c\/p\u003e\n\u003cp\u003eEngineered exclusively for the 2017 model year William Optics GT102 and FLT 132 refractors equipped with the 3\" V-Power focuser, this component ensures correct spacing and a stable imaging train. Using the correct, manufacturer-specified adapter is critical for capturing sharp, round stars across your entire field of view.\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 telescopes is the WO-AD4-A006-L00BL03 adapter compatible with?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis adapter is specifically designed for the \u003cstrong\u003eWilliam Optics Gran Turismo 102\u003c\/strong\u003e and \u003cstrong\u003eFLT 132\u003c\/strong\u003e refractors from the \u003cstrong\u003e2017 model year\u003c\/strong\u003e that are equipped with the \u003cstrong\u003e3\" V-Power focuser\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the purpose of this William Optics Draw Tube Adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIts sole purpose is to securely connect a William Optics \u003cstrong\u003eFlat4 field flattener\u003c\/strong\u003e to the draw tube of a compatible telescope. This creates a rigid, threaded connection essential for astrophotography, preventing tilt and maintaining optical alignment.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this adapter work with newer William Optics telescopes or different focusers?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, it is not guaranteed to work with models other than the specified 2017 GT102 and FLT 132 with the 3\" V-Power focuser. William Optics produces different adapters for various telescope and focuser combinations to ensure correct mechanical fit and optical 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\u003eModel Number\u003c\/td\u003e\n\u003ctd\u003eWO-AD4-A006-L00BL03\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eDraw Tube Adapter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTelescope Compatibility\u003c\/td\u003e\n\u003ctd\u003eWilliam Optics GT102, FLT 132 (2017 Models)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser Compatibility\u003c\/td\u003e\n\u003ctd\u003e3\" V-Power Focuser\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAccessory Compatibility\u003c\/td\u003e\n\u003ctd\u003eWilliam Optics Flat4 Field Flattener\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eColor\u003c\/td\u003e\n\u003ctd\u003eBlack\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\"\u003eWilliam Optics Flat4 Draw Tube 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\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":44967234404637,"sku":"WO-AD4-A006-L00BL03","price":88.0,"currency_code":"CAD","in_stock":true}]},{"product_id":"william-optics-flat4-draw-tube-adapter-for-gt102-flt-132-blue-for-3-v-power-focuser","title":"William Optics Flat4 Draw Tube Adapter for GT102, FLT 132 - Blue for 3\" V-power Focuser","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConnects Flat4 Flattener to 3\" V-Power Focuser\u003c\/li\u003e\n\u003cli\u003eCompatible with William Optics GT102 \u0026amp; FLT 132\u003c\/li\u003e\n\u003cli\u003eEngineered for 2017 Telescope Models\u003c\/li\u003e\n\u003cli\u003eSecure Threaded Attachment for Imaging\u003c\/li\u003e\n\u003cli\u003eAnodized Blue Finish\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\u003eWilliam Optics Flat4 Draw Tube Adapter for GT102, FLT 132 - Blue for 3\" V-power Focuser\u003c\/h2\u003e\n\u003cp\u003eThis William Optics adapter provides the essential threaded connection between a Flat4 field flattener and the 3\" V-Power focuser drawtube. It is specifically engineered for the 2017 models of the William Optics Gran Turismo 102 and FLT 132 refractors, ensuring a perfect mechanical and cosmetic match.\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-Thread Connection for the 3\" V-Power Focuser\u003c\/h3\u003e\n\u003cp\u003eFor astrophotography, a rigid imaging train is critical to prevent tilt and flexure. This adapter replaces standard compression fittings, creating a solid, direct-thread attachment from your Flat4 flattener to the telescope's 3\" V-Power focuser. This secure link is the foundation for achieving sharp, round stars across your entire image frame.\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\u003eAnodized Blue Finish for 2017 GT102 \u0026amp; FLT 132 Models\u003c\/h3\u003e\n\u003cp\u003eDesigned as an original equipment manufacturer (OEM) component, this adapter is purpose-built for specific William Optics telescopes. The anodized blue finish is formulated to exactly match the livery of the 2017 versions of the GT102 and FLT 132 refractors. If you own one of these models, this is the correct adapter to integrate your Flat4 flattener seamlessly.\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\"\u003eWill the Flat4 adapter fit my William Optics GT102 from 2018?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this specific adapter (WO-AD4-A006-L00BU03) is designed for the \u003cstrong\u003e2017 models\u003c\/strong\u003e of the GT102 and FLT 132 with the 3\" V-Power focuser. Later models may use a different thread pitch or focuser design, requiring a different adapter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhich focuser is this William Optics adapter compatible with?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis adapter is made exclusively for the William Optics \u003cstrong\u003e3\" V-Power focuser\u003c\/strong\u003e that was supplied with the 2017 GT102 and FLT 132 telescopes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat field flattener does the WO-AD4-A006-L00BU03 connect to?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis is a draw tube adapter designed to connect a William Optics \u003cstrong\u003eFlat4 series\u003c\/strong\u003e field flattener or flattener\/reducer to the telescope's focuser.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy do I need this adapter to image with my FLT 132?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eTo ensure a rigid, flex-free imaging train. Using this threaded adapter eliminates the potential for sag or tilt that can occur with slip-fit or compression ring-style adapters, which is critical for maintaining a flat field and sharp focus during long exposures.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs this Flat4 adapter compatible with a William Optics GT81?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this adapter is not compatible with the GT81. It is designed only for the \u003cstrong\u003eWilliam Optics GT102 and FLT 132 (2017 models)\u003c\/strong\u003e. The GT81 requires a different adapter due to its different focuser and optical design.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the color of this adapter a match for current William Optics telescopes?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis adapter features an anodized \u003cstrong\u003eblue finish\u003c\/strong\u003e intended to match the specific color scheme of the 2017 model year telescopes. It may not be a perfect cosmetic match for newer or older models with different colorways (e.g., red, gold, or space gray).\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\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eWilliam Optics GT102 \u0026amp; FLT 132 (2017 Models)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser Compatibility\u003c\/td\u003e\n\u003ctd\u003e3\" V-Power Focuser\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlattener Compatibility\u003c\/td\u003e\n\u003ctd\u003eWilliam Optics Flat4 Series\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eColor\u003c\/td\u003e\n\u003ctd\u003eBlue\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003eWO-AD4-A006-L00BU03\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\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":44967234502941,"sku":"WO-AD4-A006-L00BU03","price":88.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/William-Optics-Flat4-Draw-Tube-Adapter-for-GT102-FLT-132-Blue-for-3-inch-V-power-Focuser-AD4-A006-L00BU03-1__25851.1596133287.1280.1280.jpg?v=1684339257"},{"product_id":"william-optics-flat4-draw-tube-adapter-for-flt-gold-for-2007-2016-models","title":"William Optics Flat4 Draw Tube Adapter for FLT (Gold) for 2007-2016 Models","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eSecurely connects the Flat4 Field Flattener to the draw tube\u003c\/li\u003e\n\u003cli\u003eDesigned for William Optics FLT 98, 110, 132, and 152 models\u003c\/li\u003e\n\u003cli\u003eCompatible with telescopes manufactured between 2007 and 2016\u003c\/li\u003e\n\u003cli\u003eMachined aluminum construction\u003c\/li\u003e\n\u003cli\u003eAnodized gold finish to match original telescope trim\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\u003eWilliam Optics Flat4 Draw Tube Adapter for FLT (Gold)\u003c\/h2\u003e\n\u003cp\u003eThis William Optics Flat4 Draw Tube Adapter provides the essential mechanical link for attaching a Flat4 series field flattener to specific William Optics FLT refractors. It is engineered for FLT models including the 98, 110, 132, and 152, specifically for telescopes produced between 2007 and 2016. The adapter ensures a secure, threaded connection directly to the focuser's draw tube, establishing the correct spacing and alignment for a flat imaging field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eFor FLT 98, 110, 132 \u0026amp; 152 Telescopes (2007-2016)\u003c\/h3\u003e\n\u003cp\u003eThis adapter is a required component for imagers using older-generation William Optics FLT quadruplet refractors who wish to use the compatible Flat4 flattener. Its threading and dimensions are precisely matched to the focusers on FLT models manufactured from 2007 to 2016, including the FLT98, FLT110, FLT132, and FLT152. The anodized gold finish is designed to cosmetically match the original trim and accents of these classic William Optics telescopes.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecific Compatibility:\u003c\/strong\u003e This part is not universal. It is designed only for the specified FLT models and years; it will not work with other William Optics telescopes or focusers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImaging Requirement:\u003c\/strong\u003e Without this adapter, you cannot properly connect the Flat4 flattener to the telescope's draw tube, making it impossible to achieve a corrected field for astrophotography.\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 purpose of the William Optics WO-AD4-A006-L00GD03 adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis adapter is a specialized mechanical part that allows you to securely thread a \u003cstrong\u003eWilliam Optics Flat4 field flattener\u003c\/strong\u003e onto the focuser draw tube of specific FLT telescopes (models 98, 110, 132, and 152) made between 2007 and 2016. It is required for astrophotography with that combination of equipment.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this Flat4 adapter fit my 2010 William Optics FLT110?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. This adapter is specified for all William Optics FLT 98, 110, 132, and 152 models manufactured from \u003cstrong\u003e2007 through 2016\u003c\/strong\u003e, so your 2010 model is fully compatible.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs this adapter compatible with newer William Optics telescopes made after 2016?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. This adapter is designed specifically for the focuser thread pattern and dimensions of the 2007-2016 generation of FLT telescopes. Newer models use different focuser designs and require different adapters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I install this Flat4 adapter on my FLT132?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eInstallation typically involves unthreading the standard 2\" visual back or eyepiece holder from the end of your FLT132's focuser draw tube. This adapter then threads directly onto the exposed male threads of the draw tube, providing the correct connection for your Flat4 flattener.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the gold color of this adapter match the original telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the gold anodized finish was intentionally chosen to match the distinctive gold trim and lens cell accents found on the William Optics FLT series telescopes from that manufacturing period.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this adapter to connect a different brand of flattener to my FLT98?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis is not recommended. The adapter is designed to provide the correct threading and spacing for the William Optics Flat4 flattener. Using it with another flattener will likely result in incorrect spacing, leading to poor off-axis star shapes and other imaging artifacts.\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 Name\u003c\/td\u003e\n\u003ctd\u003eWilliam Optics Flat4 Draw Tube Adapter for FLT (Gold)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eWO-AD4-A006-L00GD03\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinish\u003c\/td\u003e\n\u003ctd\u003eAnodized Gold\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTelescope Compatibility\u003c\/td\u003e\n\u003ctd\u003eWilliam Optics FLT 98, FLT 110, FLT 132, FLT 152\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel Year Compatibility\u003c\/td\u003e\n\u003ctd\u003e2007 - 2016\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlattener Compatibility\u003c\/td\u003e\n\u003ctd\u003eWilliam Optics Flat4 Series\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\"\u003eWilliam Optics Flat4 Draw Tube Adapter for FLT (Gold)\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\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eNo downloads available for this product.\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\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":44967237091613,"sku":"WO-AD4-A006-L00GD03","price":88.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/William-Optics-Flat4-Draw-Tube-Adapter-for-FLT-Gold-for-2007-2016-Models-AD4-A006-L00GD03-1__03709.1596133287.1280.1280.jpg?v=1684339579"},{"product_id":"william-optics-2-rotolock-adapter-sct","title":"William Optics 2\" RotoLock Adapter - SCT","description":"\u003cul\u003e\n\t\u003cli\u003e\nDesigned for Schmidt-Cassegrain Telescopes (SCT)\n\t\u003c\/li\u003e\n\t\u003cli\u003e\nFeatures a secure RotoLock mechanism for 2\" accessories\n\t\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\t\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cul class=\"tabs-content\"\u003e\n\t\u003cli class=\"active\"\u003e\n\t\t\u003cp\u003e\nThe William Optics 2\" RotoLock Adapter - SCT is a high-quality accessory designed to enhance the versatility and functionality of Schmidt-Cassegrain Telescopes. This adapter allows users to securely attach 2\" accessories to their SCT, while providing the added benefit of rotational adjustment for precise positioning.\n\t\t\u003c\/p\u003e\n\t\t\u003cdiv class=\"warning\"\u003e\n\t\t\t\u003cimg alt=\"Disclaimer\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/warning-logo.svg?v=1714663206\" width=\"25px\"\u003e\n\t\t\t\u003cp\u003e\nSpecifically designed for use with Schmidt-Cassegrain Telescopes (SCT).\n\t\t\t\u003c\/p\u003e\n\t\t\u003c\/div\u003e\n\t\t\n\t\t\u003cdiv\u003e\n\t\t\t\u003ch3\u003e\nCompatibility\n\t\t\t\u003c\/h3\u003e\n\t\t\t\u003chr\u003e\n\t\t\t\u003cdiv class=\"two-columns-section\"\u003e\n\t\t\t\t\u003cdiv class=\"text-side-2\"\u003e\n\t\t\t\t\t\u003cp\u003e\nThe RotoLock Adapter is engineered to fit standard Schmidt-Cassegrain Telescopes, providing a secure connection between the telescope and 2\" accessories such as diagonal mirrors, eyepieces, and cameras.\n\t\t\t\t\t\u003c\/p\u003e\n\t\t\t\t\u003c\/div\u003e\n\t\t\t\t\u003cdiv class=\"image-side-2\" data-mce-style=\"text-align: start;\" style=\"text-align: start;\"\u003e\n\t\t\t\t\t\u003cimg alt=\"William Optics 2\" rotolock adapter sct src=\"https:\/\/davidastro.com\/cdn\/shop\/products\/William-Optics-2-inch-RotoLock-Adapter-SCT-D-ROTO-A2-SCT2F-1__24380.1596133288.1280.1280_1028x1028.jpg?v=1684339259\" style=\"margin-bottom: 16px; float: none;\"\u003e\n\t\t\t\t\u003c\/div\u003e\n\t\t\t\u003c\/div\u003e\n\n\t\t\t\u003cdiv data-mce-style=\"backgroundcolor: #0a0001; border-radius: 5px;\" style=\"background-color: #0a0001; border-radius: 5px;\"\u003e\n\t\t\t\t\u003ch3 style=\"color: white!important;\"\u003e\nRotoLock Mechanism\n\t\t\t\t\u003c\/h3\u003e\n\t\t\t\t\u003chr\u003e\n\t\t\t\t\u003cdiv class=\"two-columns-section\"\u003e\n\t\t\t\t\t\u003cdiv class=\"image-side-2\" data-mce-style=\"text-align: start;\" style=\"text-align: start;\"\u003e\n\t\t\t\t\t\t\u003cimg alt=\"William Optics 2\" rotolock adapter sct src=\"https:\/\/davidastro.com\/cdn\/shop\/products\/William-Optics-2-inch-RotoLock-Adapter-SCT-D-ROTO-A2-SCT2F-1__24380.1596133288.1280.1280_1028x1028.jpg?v=1684339259\" style=\"margin-bottom: 16px; float: none;\"\u003e\n\t\t\t\t\t\u003c\/div\u003e\n\t\t\t\t\t\u003cdiv class=\"text-side-2\"\u003e\n\t\t\t\t\t\t\u003cp style=\"color: white!important;\"\u003e\nThe innovative RotoLock mechanism allows for smooth rotation of attached accessories while maintaining a secure grip. This feature enables precise positioning and framing without the need to loosen and retighten the adapter.\n\t\t\t\t\t\t\u003c\/p\u003e\n\t\t\t\t\t\u003c\/div\u003e\n\t\t\t\t\u003c\/div\u003e\n\t\t\t\u003c\/div\u003e\n\t\t\u003c\/div\u003e\n\n\t\t\u003ch3\u003eConstruction and Durability\u003c\/h3\u003e\n\t\t\u003chr\u003e\n\t\t\u003cp\u003e\nCrafted from high-quality materials, typically anodized aluminum, the RotoLock Adapter offers excellent durability and resistance to wear. Its robust construction ensures long-lasting performance and reliability in various observing conditions.\n\t\t\u003c\/p\u003e\n\t\t\n\t\t\u003ch3\u003e\nEase of Use\n\t\t\u003c\/h3\u003e\n\t\t\u003chr\u003e\n\t\t\u003cp\u003e\nDesigned for user-friendly operation, the adapter allows for quick and easy attachment and detachment of accessories. The RotoLock mechanism can be operated with one hand, making equipment changes and adjustments more convenient.\n\t\t\u003c\/p\u003e\n\t\t\n\t\t\u003ch3\u003e\nPrecision Engineering\n\t\t\u003c\/h3\u003e\n\t\t\u003chr\u003e\n\t\t\u003cp\u003e\nManufactured to tight tolerances, the adapter ensures a precise fit with both the telescope and attached accessories. This precision helps maintain optical alignment and reduces the risk of flexure or movement during use.\n\t\t\u003c\/p\u003e\n\n\t\t\u003ch3\u003e\nVersatility\n\t\t\u003c\/h3\u003e\n\t\t\u003chr\u003e\n\t\t\u003cp\u003e\nWhile specifically designed for SCTs, this adapter expands the telescope's compatibility with a wide range of 2\" accessories, enhancing its versatility for various astronomical applications, including visual observation and astrophotography.\n\t\t\u003c\/p\u003e\n\n\t\t\u003ch3\u003e\nSmooth Rotation\n\t\t\u003c\/h3\u003e\n\t\t\u003chr\u003e\n\t\t\u003cp\u003e\nThe rotational capability of the adapter allows for easy framing of celestial objects and convenient positioning of camera or eyepiece orientations without disturbing the telescope's alignment.\n\t\t\u003c\/p\u003e\n\n\t\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":44967237157149,"sku":"WO-D-ROTO-A2-SCT2F","price":143.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/William-Optics-2-inch-RotoLock-Adapter-SCT-D-ROTO-A2-SCT2F-1__24380.1596133288.1280.1280.jpg?v=1684339259"},{"product_id":"william-optics-sct-connection-for-wo-diagonals-gold","title":"William Optics SCT Connection for WO Diagonals - Gold","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConnects M50.8 Male to M48 Female Threads\u003c\/li\u003e\n\u003cli\u003eAdds 13.8 mm of Optical Length\u003c\/li\u003e\n\u003cli\u003eFemale Thread: M50.8\u003c\/li\u003e\n\u003cli\u003eMale Thread: M48\u003c\/li\u003e\n\u003cli\u003eSignature William Optics Gold Anodized Finish\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\u003eWilliam Optics SCT Connection for WO Diagonals - Gold\u003c\/h2\u003e\n\u003cp\u003eThe William Optics SCT Connection for WO Diagonals creates a precise, threaded link between components, featuring a female M50.8 input thread and a male M48 output thread. This robust adapter adds a minimal 13.8 mm of optical length to your imaging train, ensuring a rigid, flex-free connection for your William Optics hardware.\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 M50.8 to M48 Adaptation in 13.8mm\u003c\/h3\u003e\n\u003cp\u003eThis adapter is engineered to establish a secure, non-flexing link within your optical train. It directly converts a male M50.8 thread to a male M48 thread, which is essential for connecting specific William Optics accessories or creating custom imaging configurations where a standard connection is not available.\u003c\/p\u003e\n\u003cp\u003eThe 13.8 mm optical path length is a critical specification for achieving correct spacing with flatteners or reducers that require precise back focus. Its all-metal construction and signature gold anodized finish ensure both durability and a perfect aesthetic match with other William Optics components.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFemale M50.8 Thread:\u003c\/strong\u003e Connects securely to accessories with a male M50.8 output thread, common on some William Optics flatteners and accessories.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMale M48 Thread:\u003c\/strong\u003e Provides a standard 2-inch filter thread for connecting to cameras, filter wheels, or other M48-threaded accessories.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptical Path (13.8 mm):\u003c\/strong\u003e Adds a defined and minimal length, a known value critical for maintaining proper back focus calculations in an imaging 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\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat are the exact thread types on the William Optics SCT Connection adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe adapter features a \u003cstrong\u003efemale M50.8 thread\u003c\/strong\u003e on the side that accepts incoming light and a \u003cstrong\u003emale M48 thread\u003c\/strong\u003e on the output side.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow much length does the William Optics SCT Connection add to an optical path?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis adapter adds exactly \u003cstrong\u003e13.8 mm\u003c\/strong\u003e of optical length to your setup. This is a critical measurement to factor into your back focus calculations when using reducers or flatteners.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this William Optics adapter to connect a flattener with a male M50.8 thread to my camera's M48 T-ring?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this adapter is designed for that specific purpose. The female M50.8 side will thread onto your flattener, and the male M48 side will connect to any accessory with a female M48 thread, such as a 2\" filter wheel or a camera-specific M48 adapter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this William Optics adapter connect my 2\" diagonal to a Celestron 8\" SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eBased on the specified threads (M50.8 female and M48 male), this adapter is \u003cstrong\u003enot\u003c\/strong\u003e designed to connect a standard William Optics diagonal to a standard SCT rear cell, which typically requires a female 2\"-24 TPI SCT thread. This adapter is intended for connecting components within an existing M50.8\/M48 threaded system. Always verify the threads on your specific diagonal and telescope before purchasing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the benefit of a threaded connection over a slip-fit adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA fully threaded connection, like the one provided by the William Optics SCT Connection, prevents any sag, tilt, or wobble in the optical train. This rigidity is critical for astrophotography to ensure stars remain sharp and round across the entire image field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the \"Gold\" in the William Optics SCT Connection name signify?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \"Gold\" refers to the durable, gold-anodized finish. This not only protects the CNC-machined aluminum adapter from scratches and corrosion but also provides a premium, aesthetic match to other William Optics telescopes and accessories.\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\u003eLight-In Side (Female Thread)\u003c\/td\u003e\n\u003ctd\u003eM50.8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLight-Out Side (Male Thread)\u003c\/td\u003e\n\u003ctd\u003eM48\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Length\u003c\/td\u003e\n\u003ctd\u003e13.8 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eCNC-Machined Aluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinish\u003c\/td\u003e\n\u003ctd\u003eGold 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\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eWilliam Optics SCT Connection Adapter - Gold\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\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":44967237222685,"sku":"WO-D-SCT-TA","price":62.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/William-Optics-SCT-Connection-for-WO-Diagonals-Gold-D-SCT-TA-G-1__46435.1596133290.1280.1280.jpg?v=1684339278"},{"product_id":"william-optics-2-1-25-rotolock-visual-back-adapter","title":"William Optics 2\"-1.25\" RotoLock Visual Back Adapter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConverts 2\" focusers to a 1.25\" holder\u003c\/li\u003e\n\u003cli\u003eInnovative RotoLock self-centering mechanism\u003c\/li\u003e\n\u003cli\u003eDual input: 2\" push-in barrel and female M48 threads\u003c\/li\u003e\n\u003cli\u003eAdds 38 mm of optical length\u003c\/li\u003e\n\u003cli\u003ePrevents marring of eyepiece barrels\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\u003eWilliam Optics 2\"-1.25\" RotoLock Visual Back Adapter\u003c\/h2\u003e\n\u003cp\u003eThe William Optics 2\"-1.25\" RotoLock Visual Back Adapter replaces standard thumbscrew holders, converting your 2\" focuser or M48 threaded accessory port into a precision 1.25\" eyepiece clamp. With a minimal optical path length of just 38 mm, this adapter provides a perfectly centered, rigid connection that eliminates eyepiece wobble and protects your equipment from scratches.\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\u003eThe RotoLock Advantage: Secure, Self-Centering 1.25\" Grip\u003c\/h3\u003e\n\u003cp\u003eThe core of this adapter is the William Optics RotoLock system. A simple twist of the knurled locking ring activates an internal compression band that applies even, concentric pressure around the entire 1.25\" barrel of your eyepiece or camera nosepiece. This design guarantees your accessory is held perfectly on the optical axis, a critical factor for maintaining sharp, coma-free views and achieving precise collimation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eDual-Input Versatility: 2\" Push-in and M48 Threading\u003c\/h3\u003e\n\u003cp\u003eThis adapter is engineered for maximum compatibility with your existing gear. The light-in side features both a standard 2\" male barrel for push-in connection to any 2\" focuser or diagonal, and internal M48 female threads. This threaded connection allows you to securely attach the RotoLock directly to field flatteners, reducers, or other accessories that use the common 2\" filter thread standard, creating a solid, flex-free imaging train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eRotoLock vs. Thumbscrew Adapters: A Difference in Precision\u003c\/h3\u003e\n\u003cp\u003eA standard thumbscrew adapter pushes an eyepiece barrel off-center and can easily mar its surface with repeated use. The RotoLock system solves both problems definitively.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePerfect Centering:\u003c\/strong\u003e Thumbscrews introduce tilt by pushing from a single point. The RotoLock's 360° compression ring ensures your eyepiece is always aligned with the optical axis, preserving the view quality of your telescope.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo Barrel Damage:\u003c\/strong\u003e The soft, uniform grip of the compression ring will not scratch, dent, or leave set-screw marks on your expensive eyepiece barrels, preserving their condition and resale value.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuperior Hold:\u003c\/strong\u003e The RotoLock provides a far more secure hold than a single thumbscrew, preventing heavy eyepieces or cameras from shifting or rotating unexpectedly as you move the telescope.\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 benefit of the William Optics RotoLock over a standard 1.25\" adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary benefit is \u003cstrong\u003eperfectly centered, secure clamping\u003c\/strong\u003e. Unlike thumbscrew adapters that push eyepieces off-axis and can cause them to wobble, the RotoLock's internal compression ring grips the barrel from all sides simultaneously, ensuring perfect optical alignment and a much stronger hold without marring the barrel.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I use the M48 thread on the William Optics RotoLock adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe female M48 (48mm x 0.75mm) thread is located inside the 2\" barrel. You can thread the adapter directly onto accessories like field flatteners or reducers that have a male M48 thread. This creates a more rigid and secure connection than a simple push-fit adapter, which is ideal for astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the 38mm optical length of the William Optics RotoLock cause focusing issues?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor most telescopes, the 38 mm optical length is easily accommodated by the focuser's travel range. However, if your telescope has very limited back focus, particularly in an imaging setup with multiple accessories, you should measure your available focus travel to ensure you can reach infinity focus with this adapter in the optical train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the William Optics RotoLock adapter with my 2\" diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. Simply insert the RotoLock's 2\" barrel into your diagonal's eyepiece holder, just as you would with a 2\" eyepiece. This instantly upgrades your diagonal to a premium, self-centering 1.25\" holder, which is especially useful for high-magnification planetary viewing where precise centering is critical.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the RotoLock mechanism wear out over time?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe William Optics RotoLock is a robust mechanical system designed for longevity. With normal use, the internal compression mechanism is highly durable and will provide years of reliable, trouble-free operation without any significant wear.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the William Optics RotoLock adapter difficult to use in the dark or with gloves?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, it's often easier than fumbling with small thumbscrews. The large, knurled locking ring is easy to grip and turn, even with light gloves on. A short, intuitive twist is all that's needed to lock or unlock an eyepiece, making it a very field-friendly upgrade.\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\u003eInput Connection\u003c\/td\u003e\n\u003ctd\u003e2\" Push-in (male) \/ M48x0.75 (female)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Connection\u003c\/td\u003e\n\u003ctd\u003e1.25\" Push-in with RotoLock (female)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Length\u003c\/td\u003e\n\u003ctd\u003e38 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\"\u003eWilliam Optics 2\"-1.25\" RotoLock 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\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Gold","offer_id":44967237255453,"sku":"WO-F-ROTO-A2-125GDII","price":80.0,"currency_code":"CAD","in_stock":true},{"title":"Red","offer_id":44967237288221,"sku":"WO-F-ROTO-A2-125RDII","price":80.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/William-Optics-2-inch-1-25-inch-RotoLock-Visual-Back-Adapter-F-ROTO-A2-125-1__18533.1596133290.1280.1280.jpg?v=1684339282"},{"product_id":"william-optics-1-25-rotolock-visual-back-adapter-sct","title":"William Optics 1.25\" RotoLock Visual Back Adapter - SCT","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eSecurely holds 1.25\" eyepieces and accessories\u003c\/li\u003e\n\u003cli\u003eRotoLock system provides self-centering, even grip\u003c\/li\u003e\n\u003cli\u003eAttaches to standard SCT rear threads (M50.8 female input)\u003c\/li\u003e\n\u003cli\u003eAdds 50.7 mm of optical length\u003c\/li\u003e\n\u003cli\u003eReplaces standard visual backs with a non-marring design\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\u003eWilliam Optics 1.25\" RotoLock Visual Back Adapter - SCT\u003c\/h2\u003e\n\u003cp\u003eThe William Optics 1.25\" RotoLock Visual Back Adapter replaces your telescope's standard visual back with a secure, self-centering mechanism that adds just 50.7 mm of optical length. Its M50.8 female input and 1.25\" female output create a solid, single-twist connection for your eyepieces and accessories, designed for standard Schmidt-Cassegrain Telescope threads.\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\u003eThe 50.7mm RotoLock System: One Twist for Perfect 1.25\" Centering\u003c\/h3\u003e\n\u003cp\u003eThe core of this adapter is the innovative RotoLock mechanism. A simple twist of the red, knurled ring activates an internal compression band that closes evenly around your 1.25\" eyepiece or camera nosepiece. This ensures your accessory is held perfectly on the optical axis, eliminating the tilt and sag common with single-thumbscrew designs.\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 1.25\" Grip: Eliminating Thumbscrew Wobble and Scratches\u003c\/h3\u003e\n\u003cp\u003eStandard visual backs rely on one or two thumbscrews that push an accessory barrel off-center and can easily scratch or mar its surface. The RotoLock adapter solves both problems by applying uniform pressure around the entire circumference. This not only provides a more secure and stable connection but also protects your investment in high-quality eyepieces and cameras from damage.\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 main benefit of the William Optics 1.25\" RotoLock Adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary benefit is its \u003cstrong\u003eself-centering, non-marring grip\u003c\/strong\u003e. Unlike thumbscrews that push an eyepiece to one side and can scratch the barrel, the RotoLock system provides a secure, perfectly aligned hold with a simple twist, protecting your gear and ensuring optimal optical alignment.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the William Optics RotoLock SCT Adapter work on my Celestron 8\" SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. This adapter is designed to thread directly onto the standard rear cell threads found on most Schmidt-Cassegrain telescopes, including popular models from Celestron and Meade.\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 William Optics RotoLock SCT Adapter use?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe adapter adds \u003cstrong\u003e50.7 mm of optical length\u003c\/strong\u003e to your imaging or visual train. You should ensure you have sufficient back focus available, particularly if you plan to use it with other accessories like a focal reducer or filter wheel.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the William Optics 1.25\" RotoLock Adapter secure enough for a small camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. The even, compressive grip of the RotoLock system is significantly more secure than a single thumbscrew, making it an excellent choice for lightweight 1.25\" planetary cameras and guide cameras. It prevents flexure and ensures the camera sensor remains stable and aligned.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the William Optics RotoLock Adapter damage my eyepiece barrels?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The adapter uses an internal compression ring that distributes pressure evenly around the barrel's surface. This design avoids the focused pressure point of a metal thumbscrew, which is the primary cause of scratches and scoring on eyepiece barrels.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the William Optics RotoLock Adapter improve imaging of Jupiter with a 1.25\" camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor high-resolution planetary imaging of targets like Jupiter or Saturn, maintaining perfect optical alignment is critical. The RotoLock adapter ensures your 1.25\" camera sensor is held perfectly parallel to the focal plane, preventing any tilt that could soften one side of the image. This leads to consistently sharper results across the entire planetary disk.\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\u003eInput Connection\u003c\/td\u003e\n\u003ctd\u003eM50.8 (female) - SCT Thread\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Connection\u003c\/td\u003e\n\u003ctd\u003e1.25\" RotoLock (female)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Length\u003c\/td\u003e\n\u003ctd\u003e50.7 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\"\u003e1.25\" RotoLock Visual Back Adapter for SCT\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\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":44967237386525,"sku":"WO-F-ROTO-A2-125-SCT-TA","price":135.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/William-Optics-1-25-inch-RotoLock-SCT-F-ROTO-A2-125GDII-D-SCT-TA-1__15415.1596133291.1280.1280.jpg?v=1684339289"},{"product_id":"william-optics-3-5-2-rotolock-visual-back-adapter","title":"William Optics 3.5\"-2\" RotoLock Visual Back Adapter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eAdapts 3.5\" William Optics focusers to a 2\" receiver\u003c\/li\u003e\n\u003cli\u003eFeatures the secure, self-centering RotoLock mechanism\u003c\/li\u003e\n\u003cli\u003eConnects via M92 x 1 male threads\u003c\/li\u003e\n\u003cli\u003eAdds only 25 mm to the optical path\u003c\/li\u003e\n\u003cli\u003eCNC-machined from high-grade 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\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\u003eWilliam Optics 3.5\"-2\" RotoLock Visual Back Adapter\u003c\/h2\u003e\n\u003cp\u003eThe William Optics 3.5\"-2\" RotoLock Visual Back Adapter converts the M92 x 1 male thread of a 3.5\" William Optics focuser into a secure, self-centering 2\" female receiver. This precision-machined adapter adds just 25 mm of optical length, creating a mar-free grip on your most valuable eyepieces and accessories without the hassle of traditional thumbscrews.\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\u003eThe 2\" RotoLock System: A Secure, Self-Centering Grip\u003c\/h3\u003e\n\u003cp\u003eThe RotoLock system replaces conventional thumbscrews with a simple, intuitive rotating collar. A gentle twist of the knurled ring engages an internal compression band, applying uniform pressure around the barrel of your 2\" diagonal, eyepiece, or camera nosepiece. This design ensures your accessories are perfectly centered on the optical axis, preventing tilt and maintaining sharp focus from edge to edge.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo More Scratches:\u003c\/strong\u003e The compression band provides a firm hold without gouging or marring the finish on your accessory barrels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePerfect Axial Alignment:\u003c\/strong\u003e By applying even pressure, the RotoLock automatically centers the accessory in the drawtube, which is critical for imaging and high-power visual observation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOne-Handed Operation:\u003c\/strong\u003e The large, knurled ring is easy to operate even with gloves on, and there are no small thumbscrews to drop or lose in the dark.\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\u003eM92 Threads for 3.5\" William Optics FLT Focusers\u003c\/h3\u003e\n\u003cp\u003eThis adapter is engineered specifically as an upgrade for William Optics refractors equipped with their robust 3.5\" rack-and-pinion focuser. The male M92 x 1 threads ensure a rigid, direct connection to the focuser drawtube, eliminating any potential for flexure. Consuming only 25 mm of optical length, the RotoLock is an efficient solution for visual observers and imagers who require a solid 2\" connection without sacrificing significant back focus. Available in multiple anodized colors, it allows you to match the aesthetic trim of your William Optics telescope for a seamless, integrated look.\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\"\u003eWill this William Optics RotoLock adapter fit a non-William Optics telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this adapter is designed specifically for the \u003cstrong\u003eM92 x 1 male thread\u003c\/strong\u003e found on William Optics 3.5\" focusers, typically included with their FLT series refractors. It is not compatible with standard SCT threads or other focuser brands.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the RotoLock system on this 3.5\"-2\" adapter work?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe RotoLock adapter uses a rotating collar that tightens an internal, split compression ring. As you twist the collar, the ring gently and evenly squeezes the barrel of your 2\" accessory. This provides a secure, self-centering grip that is superior to the single-point pressure of a thumbscrew.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the advantage of the RotoLock adapter over a standard 2\" visual back?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary advantages are:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelf-Centering:\u003c\/strong\u003e Ensures perfect alignment of your diagonal or camera with the telescope's optical axis.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo Marring:\u003c\/strong\u003e It will not leave scratches or gouges on your eyepiece and accessory barrels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSecure Grip:\u003c\/strong\u003e Provides a stronger, more reliable hold on heavy accessories, preventing sag or wobble.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI use a William Optics FLT132 for imaging. How does this RotoLock adapter affect my 25 mm optical path?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe adapter's \u003cstrong\u003e25 mm optical length\u003c\/strong\u003e must be factored into your total back focus calculation. You must subtract this 25 mm from the available back focus of your telescope and flattener combination to determine the remaining distance for your camera and other accessories.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the RotoLock adapter with a heavy 2\" diagonal on my William Optics FLT refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. The RotoLock mechanism is ideal for heavy accessories like 2\" dielectric diagonals loaded with large eyepieces. The uniform grip provides a much more secure and stable connection than a single thumbscrew, significantly reducing the risk of wobble or accidental slippage.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I install the William Optics M92 RotoLock adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eInstallation is straightforward. Simply unthread the existing visual back or adapter from the end of your 3.5\" focuser's drawtube and carefully thread the M92 RotoLock adapter on in its place until it is snug.\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\u003eFocuser-Side Connection\u003c\/td\u003e\n\u003ctd\u003eM92 x 1 Male Thread\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAccessory-Side Connection\u003c\/td\u003e\n\u003ctd\u003e2\" RotoLock Receiver (Female)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Path Length\u003c\/td\u003e\n\u003ctd\u003e25 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\"\u003eWilliam Optics 3.5\"-2\" RotoLock Visual Back 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\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Gold","offer_id":44967237419293,"sku":"WO-F-ROTO-A3.5-2GD","price":315.0,"currency_code":"CAD","in_stock":true},{"title":"Blue","offer_id":44967237452061,"sku":"WO-F-ROTO-A3.5-2BU","price":315.0,"currency_code":"CAD","in_stock":true},{"title":"Red","offer_id":44967237484829,"sku":"WO-F-ROTO-A3.5-2RD","price":315.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/William-Optics-3-5-inch-2-inch-RotoLock-Visual-Back-Adapter-F-ROTO-A3.5-2-1__00187.1596133292.1280.1280.jpg?v=1684339296"},{"product_id":"william-optics-2-rotolock-m63","title":"William Optics 2\" RotoLock - M63","description":"\u003cul\u003e\n    \u003cli\u003e\n        2\" RotoLock adapter designed for M63 threads\n    \u003c\/li\u003e\n    \u003cli\u003e\n        Ensures a secure and precise connection for 2\" accessories\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\u003c\/ul\u003e\n\n\u003cul class=\"tabs-content\"\u003e\n    \u003cli class=\"active\"\u003e\n        \u003cp\u003e\n            The William Optics 2\" RotoLock - M63 is a high-quality adapter designed to provide a secure and precise connection for 2\" accessories to M63 threaded focusers. This innovative RotoLock design ensures a tight grip, minimizing any unwanted movement or flex, and making it an essential accessory for astrophotographers and visual observers seeking optimal performance.\n        \u003c\/p\u003e\n        \u003cdiv class=\"warning\"\u003e\n            \u003cimg alt=\"Disclaimer\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/warning-logo.svg?v=1714663206\" width=\"25px\"\u003e\n            \u003cp\u003e\n                Telescopes and accessories sold separately.\n            \u003c\/p\u003e\n        \u003c\/div\u003e\n        \n        \u003cdiv\u003e\n            \u003ch3\u003e\n                Features\n            \u003c\/h3\u003e\n            \u003chr\u003e\n            \u003cdiv class=\"two-columns-section\"\u003e\n                \u003cdiv class=\"text-side-2\"\u003e\n                    \u003cp\u003e\n                        Designed to fit M63 threaded focusers, ensuring compatibility with a wide range of telescopes.\n                    \u003c\/p\u003e\n                    \u003cp\u003e\n                        Provides a secure and precise connection for 2\" accessories, enhancing stability and performance.\n                    \u003c\/p\u003e\n                \u003c\/div\u003e\n                \u003cdiv class=\"image-side-2\" style=\"text-align: start;\"\u003e\n                    \u003cimg alt=\"William Optics 2\\\" rotolock m63 src=\"https:\/\/davidastro.com\/cdn\/shop\/files\/William-Optics-2-inch-RotoLock-M63-F-ROTO-A63SL-2__64123.1596133293.1280.1280_832x832.jpg?v=1684339300\"\u003e\n                \u003c\/div\u003e\n            \u003c\/div\u003e\n\n            \u003cdiv style=\"background-color: #0a0001; border-radius: 5px;\"\u003e\n                \u003ch3 style=\"color: white!important;\"\u003e\n                    High-Quality Construction\n                \u003c\/h3\u003e\n                \u003chr\u003e\n                \u003cdiv class=\"two-columns-section\"\u003e\n                    \u003cdiv class=\"image-side-2\" style=\"text-align: start;\"\u003e\n                        \u003cimg alt=\"William Optics 2\\\" rotolock m63 src=\"https:\/\/davidastro.com\/cdn\/shop\/files\/William-Optics-2-inch-RotoLock-M63-F-ROTO-A63SL-1__85254.1596133293.1280.1280_832x832.jpg?v=1684339298\"\u003e\n                    \u003c\/div\u003e\n                    \u003cdiv class=\"text-side-2\"\u003e\n                        \u003cp style=\"color: white!important;\"\u003e\n                            Made from durable materials to ensure longevity and reliable performance in various astrophotography setups.\n                        \u003c\/p\u003e\n                    \u003c\/div\u003e\n                \u003c\/div\u003e\n            \u003c\/div\u003e\n        \u003c\/div\u003e\n\n        \u003ch3\u003e\n            Ease of Use\n        \u003c\/h3\u003e\n        \u003chr\u003e\n        \u003cp\u003e\n            Simple to attach and detach, with the RotoLock mechanism providing quick and secure adjustments.\n        \u003c\/p\u003e\n\n    \u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":44967237550365,"sku":"WO-F-ROTO-A63SL","price":127.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/William-Optics-2-inch-RotoLock-M63-F-ROTO-A63SL-1__85254.1596133293.1280.1280.jpg?v=1684339298"},{"product_id":"william-optics-4-extension-tube-for-flt-series","title":"William Optics 4\" Extension Tube for FLT Series","description":"\u003cul\u003e\n    \u003cli\u003e\n        4\" extension tube designed for William Optics FLT Series\n    \u003c\/li\u003e\n    \u003cli\u003e\n        Provides additional back focus for various optical setups\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\u003c\/ul\u003e\n\n\u003cul class=\"tabs-content\"\u003e\n    \u003cli class=\"active\"\u003e\n        \u003cp\u003e\n            The William Optics 4\" Extension Tube for FLT Series is a precision-engineered accessory designed to provide additional back focus for your William Optics FLT telescopes. This extension tube is essential for achieving the correct focus when using various imaging accessories, ensuring optimal performance and flexibility in your astrophotography setup.\n        \u003c\/p\u003e\n        \u003cdiv class=\"warning\"\u003e\n            \u003cimg alt=\"Disclaimer\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/warning-logo.svg?v=1714663206\" width=\"25px\"\u003e\n            \u003cp\u003e\n                Telescopes and accessories sold separately.\n            \u003c\/p\u003e\n        \u003c\/div\u003e\n        \n        \u003cdiv\u003e\n            \u003ch3\u003e\n                Features\n            \u003c\/h3\u003e\n            \u003chr\u003e\n            \u003cdiv class=\"two-columns-section\"\u003e\n                \u003cdiv class=\"text-side-2\"\u003e\n                    \u003cp\u003e\n                        Specifically designed for use with William Optics FLT Series telescopes, ensuring compatibility and a secure fit.\n                    \u003c\/p\u003e\n                    \u003cp\u003e\n                        Provides an additional 4 inches of back focus, allowing for the integration of various optical accessories such as cameras, focal reducers, and filters.\n                    \u003c\/p\u003e\n                \u003c\/div\u003e\n                \u003cdiv class=\"image-side-2\" style=\"text-align: start;\"\u003e\n                    \u003cimg alt=\"William Optics 4\\\" extension tube for flt series src=\"https:\/\/davidastro.com\/cdn\/shop\/products\/William-Optics-4-inch-Extension-Tube-for-FLT-Series-P-EXFLT-2__44358.1596133295.1280.1280_832x832.jpg?v=1684339595\"\u003e\n                \u003c\/div\u003e\n            \u003c\/div\u003e\n\n            \u003cdiv style=\"background-color: #0a0001; border-radius: 5px;\"\u003e\n                \u003ch3 style=\"color: white!important;\"\u003e\n                    High-Quality Construction\n                \u003c\/h3\u003e\n                \u003chr\u003e\n                \u003cdiv class=\"two-columns-section\"\u003e\n                    \u003cdiv class=\"image-side-2\" style=\"text-align: start;\"\u003e\n                        \u003cimg alt=\"William Optics 4\\\" extension tube for flt series src=\"https:\/\/davidastro.com\/cdn\/shop\/products\/William-Optics-4-inch-Extension-Tube-for-FLT-Series-P-EXFLT-1__16520.1596133295.1280.1280_832x832.jpg?v=1684339595\"\u003e\n                    \u003c\/div\u003e\n                    \u003cdiv class=\"text-side-2\"\u003e\n                        \u003cp style=\"color: white!important;\"\u003e\n                            Made from durable materials to ensure longevity and reliable performance in various astrophotography setups.\n                        \u003c\/p\u003e\n                    \u003c\/div\u003e\n                \u003c\/div\u003e\n            \u003c\/div\u003e\n        \u003c\/div\u003e\n\n        \u003ch3\u003e\n            Ease of Use\n        \u003c\/h3\u003e\n        \u003chr\u003e\n        \u003cp\u003e\n            Simple to attach and detach, making it a user-friendly addition to your astrophotography equipment.\n        \u003c\/p\u003e\n\n    \u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":44967237746973,"sku":"WO-P-EXFLT","price":92.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/William-Optics-4-inch-Extension-Tube-for-FLT-Series-P-EXFLT-1__16520.1596133295.1280.1280.jpg?v=1684339595"},{"product_id":"william-optics-m63m-to-m48m-photo-adapter","title":"William Optics M63(M) to M48(M) Photo Adapter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eAdds 80mm of Optical Length\u003c\/li\u003e\n\u003cli\u003eConnects to M63 Female Threads\u003c\/li\u003e\n\u003cli\u003eOutputs to M48 Male T-Threads\u003c\/li\u003e\n\u003cli\u003eEnables Focus Without a Field Flattener\u003c\/li\u003e\n\u003cli\u003eDesigned for William Optics Doublet \u0026amp; Triplet Refractors\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\u003eWilliam Optics M63(M) to M48(M) Photo Adapter\u003c\/h2\u003e\n\u003cp\u003eThe William Optics M63 to M48 Photo Adapter provides a precise 80 mm of optical length, creating the correct spacing to achieve focus when imaging without a field flattener. This adapter features M63 female threads on the telescope side and standard M48 male threads on the camera side, making it an essential component for direct-to-camera imaging with many William Optics doublet and triplet refractors.\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\u003eThe 80mm Solution for Flattener-Free Imaging\u003c\/h3\u003e\n\u003cp\u003eWhen you remove a field flattener from your imaging train, the focal plane of your telescope shifts significantly inward. This adapter compensates by adding exactly 80 mm of extension, pushing your camera sensor back to the new point of sharp focus. It's the ideal solution for visual-first observers who want to attach a camera for planetary work or casual deep-sky imaging without reinvesting in a full corrective setup.\u003c\/p\u003e\n\u003cp\u003eThe trade-off is straightforward: you achieve focus, but without the edge-of-field correction a flattener provides. For imagers using cameras with smaller sensors or those targeting central objects like Jupiter or the Ring Nebula (M57), this is often an acceptable compromise to get a camera attached and working.\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\u003eM63 Female to M48 Male: Direct Camera Connection\u003c\/h3\u003e\n\u003cp\u003eThis adapter is engineered for a specific, secure fit. The M63 female threads on the light-in side are designed to screw onto focusers or accessories that terminate in a male M63 thread. The light-out side provides a standard M48x0.75 male thread, the universal standard for connecting to DSLR\/mirrorless T-rings and dedicated astronomy cameras.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTelescope Side Connection:\u003c\/strong\u003e M63 Female Thread (screws onto an M63 male thread).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCamera Side Connection:\u003c\/strong\u003e M48 Male Thread (screws into a female T-ring or camera nosepiece).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuild:\u003c\/strong\u003e Machined from black-anodized aluminum to minimize internal reflections and maintain a rigid connection.\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\"\u003eWhy do I need the 80mm William Optics Photo Adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou need this adapter specifically when you want to do photography \u003cstrong\u003ewithout a field flattener or reducer\u003c\/strong\u003e in the optical path. Removing those components changes the focus point, and this 80 mm extension tube provides the exact distance required to bring a camera sensor to the new focal plane on many William Optics doublet and triplet refractors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhich telescopes is the WO-P-PAM-63-48 adapter designed for?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis adapter is designed specifically for William Optics doublet and triplet refractors that use an M63 thread on their focuser assembly. It is not a universal part; its 80 mm length is calculated to match the optical requirements of these specific telescopes when a flattener is removed.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of camera can I attach with this M63 to M48 adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe adapter terminates in a standard \u003cstrong\u003eM48 male thread\u003c\/strong\u003e (also known as a \"wide T-mount\"). This allows you to connect any camera that can be fitted with a female M48 T-ring, including:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDSLR and mirrorless cameras (with the appropriate M48 T-ring for your camera brand).\u003c\/li\u003e\n\u003cli\u003eMost dedicated CMOS and CCD astronomy cameras.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the William Optics Photo Adapter correct for field curvature?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, it does not. This is purely a mechanical extension tube. Its sole purpose is to add 80 mm of length to achieve focus. It contains no optics and will not flatten the field of view. You will see star distortion at the edges of the field, especially with larger camera sensors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I install the William Optics M63 to M48 adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe adapter's \u003cstrong\u003eM63 female threads\u003c\/strong\u003e screw directly onto the corresponding M63 male thread on your telescope's focuser drawtube or visual back. You then thread your M48 T-ring and camera onto the adapter's M48 male threads.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 80mm length of the WO-P-PAM-63-48 adapter adjustable?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, it is a fixed-length adapter. The 80 mm optical length is a precise value required to achieve focus on specific William Optics telescopes when their flatteners are removed. It is not designed for general-purpose use where variable spacing is needed.\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\u003eLight-In Side\u003c\/td\u003e\n\u003ctd\u003eM63 (female)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLight-Out Side\u003c\/td\u003e\n\u003ctd\u003eM48 (male)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Length\u003c\/td\u003e\n\u003ctd\u003e80 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\"\u003eWilliam Optics M63 to M48 Photo 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\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eNo downloads available for this product.\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\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":44967237878045,"sku":"WO-P-PAM-63-48","price":92.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/William-Optics-M63-Male-to-M48-Male-Photo-Adapter-P-PAM63-48-1__24722.1596133296.1280.1280.jpg?v=1684339318"},{"product_id":"william-optics-stl-adapter-for-flt-flattener","title":"William Optics STL Adapter for FLT Flattener","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConnects SBIG STL-11000 Series CCD Cameras\u003c\/li\u003e\n\u003cli\u003eAttaches to P-FLAT68 Field Flatteners via M80 Female Thread\u003c\/li\u003e\n\u003cli\u003eProvides a Precise 69 mm Optical Path Length\u003c\/li\u003e\n\u003cli\u003eSolid, Single-Piece Machined 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\u003eWilliam Optics STL Adapter for FLT Flattener\u003c\/h2\u003e\n\u003cp\u003eThe William Optics STL Adapter for FLT Flattener provides a dedicated, secure connection between your SBIG STL-11000 series camera and a William Optics P-FLAT68 field flattener. This precision-machined component establishes the exact 69 mm optical length required for optimal performance, connecting to the flattener via its female M80 threads.\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 Connection and 69mm Spacing for the P-FLAT68 Flattener\u003c\/h3\u003e\n\u003cp\u003eThis adapter is engineered to solve the specific connection and spacing challenge of pairing the P-FLAT68 field flattener with large-format SBIG STL cameras. The female M80 threads ensure a direct, rigid attachment to the flattener body, eliminating the potential for image-degrading flexure that can occur with stacked generic adapters.\u003c\/p\u003e\n\u003cp\u003eAchieving correct back focus is critical for a perfectly flat field, and this adapter delivers the required 69 mm of optical length in a single, solid component. This guarantees that the distance from the flattener's final lens element to your STL-11000's sensor plane is precisely set for sharp, pinpoint stars from corner to corner.\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 function of the William Optics STL Adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis adapter is designed specifically to connect an \u003cstrong\u003eSBIG STL-11000 series CCD camera\u003c\/strong\u003e to a \u003cstrong\u003eWilliam Optics P-FLAT68 field flattener\u003c\/strong\u003e. It serves two critical roles: providing a secure mechanical connection and establishing the precise \u003cstrong\u003e69 mm optical spacing\u003c\/strong\u003e required for optimal flat-field correction.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the WO-P-STL adapter compatible with other flatteners or cameras?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this is a dedicated adapter. It is engineered with \u003cstrong\u003eM80 female threads\u003c\/strong\u003e specifically for the P-FLAT68 flattener and the unique flange mount of the SBIG STL-11000 camera. Using it with other components is not recommended as it will likely result in an incorrect back focus distance and an inability to physically connect.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI have a William Optics FLT refractor and a P-FLAT68 flattener. Is this the right adapter for my SBIG STL-11000 camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this is the exact component you need for that setup. The WO-P-STL adapter bridges the M80 thread on the P-FLAT68 flattener to the SBIG STL camera body and sets the critical \u003cstrong\u003e69 mm back focus distance\u003c\/strong\u003e required by that specific optical combination.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is the 69 mm optical length of the WO-P-STL adapter so important?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eField flatteners like the P-FLAT68 must be placed at a very specific distance from the camera sensor to function correctly. The \u003cstrong\u003e69 mm optical length\u003c\/strong\u003e of this adapter is the prescribed spacing needed to ensure stars are sharp across the entire large sensor of an STL-11000, effectively correcting for the field curvature introduced by the telescope's main optics.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I image large targets like the Andromeda Galaxy (M31) with the WO-P-STL adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. By correctly connecting your P-FLAT68 flattener to your STL-11000 camera with this adapter, you will achieve the flat field necessary to capture large deep-sky objects like the \u003cstrong\u003eAndromeda Galaxy (M31)\u003c\/strong\u003e or the \u003cstrong\u003eNorth American Nebula (NGC 7000)\u003c\/strong\u003e without distorted stars at the edges of your frame.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy can't I just use generic M80 adapters to create 69 mm of spacing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile theoretically possible, stacking multiple generic adapters introduces several threaded junctions, which are potential sources of tilt and flexure. This single, solid adapter provides a much more rigid and reliable connection, which is critical to maintaining optical alignment when imaging with a heavy camera like the \u003cstrong\u003eSBIG STL-11000\u003c\/strong\u003e.\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\u003eWO-P-STL\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Side Connection\u003c\/td\u003e\n\u003ctd\u003eSBIG STL-11000 CCD Mount\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTelescope Side Connection\u003c\/td\u003e\n\u003ctd\u003eM80 (female)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Length\u003c\/td\u003e\n\u003ctd\u003e69 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\"\u003eWilliam Optics STL Adapter for FLT Flattener\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\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":44967237910813,"sku":"WO-P-STL","price":190.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/William-Optics-STL-1100-Adapter-for-FLT-FF-P-STL-1__84013.1596133296.1280.1280.jpg?v=1684339321"},{"product_id":"william-optics-48mm-t-mount-for-nikon-f","title":"William Optics 48mm T-Mount for Nikon F","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConnects M48 Accessories to Nikon F-Mount Cameras\u003c\/li\u003e\n\u003cli\u003ePrecisely machined 8.2 mm optical length achieves exact 55mm back focus when combined with camera\u003c\/li\u003e\n\u003cli\u003eFemale M48 x 0.75 Threads (Telescope Side)\u003c\/li\u003e\n\u003cli\u003eMale Nikon F-Mount Bayonet (Camera Side)\u003c\/li\u003e\n\u003cli\u003eWide 48mm Aperture Prevents Vignetting\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\u003eWilliam Optics 48mm T-Mount for Nikon F\u003c\/h2\u003e\n\u003cp\u003eThe William Optics 48mm T-Mount for Nikon F provides a secure, direct connection from any M48 x 0.75 threaded accessory to a Nikon F-mount camera body. Consuming exactly 8.2 mm of optical path, it works seamlessly with your DSLR camera to achieve the standard 55 mm back focus for flat-field astrophotography.\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 Spacing: Built for Standard 55mm Back Focus\u003c\/h3\u003e\n\u003cp\u003eAchieving the standard 55mm back focus distance required by most field flatteners and reducers demands exact component spacing. This William Optics T-Mount is engineered with an optical length of 8.2 mm, which combines directly with a Nikon F-mount DSLR's 46.5 mm flange distance to yield the required 55 mm total back focus (8.2 mm + 46.5 mm = 54.7 mm ~ 55 mm)—no additional spacers needed.\u003c\/p\u003e\n\u003cp\u003eBy delivering the exact 55 mm optical path out of the box when attached to your camera, this adapter removes guesswork and eliminates potential spacing errors that can introduce field curvature or other aberrations.\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\u003eSecure Connection for Full-Frame Sensors: M48 Threading\u003c\/h3\u003e\n\u003cp\u003eThe adapter features female M48 x 0.75 threads on the telescope side, providing a wider and more robust connection than standard M42 T-rings. This larger diameter is essential for fully illuminating full-frame sensors without vignetting, ensuring the entire field receives even light from your corrector.\u003c\/p\u003e\n\u003cp\u003eA secure threaded connection prevents any flexure or tilt that can occur with less rigid adapters, preserving the precise optical alignment needed for sharp stars corner-to-corner. This rigidity is especially important when supporting the weight of a DSLR camera throughout a long imaging session.\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 do I use the William Optics 48mm Nikon F T-Mount to achieve 55mm of back focus?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis T-mount provides \u003cstrong\u003e8.2 mm\u003c\/strong\u003e of optical length. A standard Nikon F-mount DSLR has a flange-to-sensor distance of 46.5 mm. When combined, the total optical path is 8.2 mm + 46.5 mm = \u003cstrong\u003e54.7 mm (~55 mm)\u003c\/strong\u003e. This delivers the required 55mm standard back focus directly from your corrector without requiring additional spacers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy should I choose this M48 T-Mount over a standard M42 T-ring for my full-frame Nikon D850?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe larger \u003cstrong\u003eM48 (48mm)\u003c\/strong\u003e opening is critical for preventing vignetting on full-frame sensors like the one in the Nikon D850. A smaller M42 T-ring can act as an aperture stop, physically blocking light and darkening the corners of your images. This M48 adapter ensures your full-frame sensor is completely illuminated.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this T-Mount to connect my Nikon D5600 to a William Optics RedCat 51?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, absolutely. The RedCat 51 has a native M48 thread on the back. This T-mount will connect directly to the telescope, allowing you to securely attach your Nikon D5600 (which uses the F-mount) at the correct 55mm back focus distance directly without any additional spacers or adapters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this William Optics M48 T-Mount work with my Nikon Z-series mirrorless camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this adapter is designed specifically for the \u003cstrong\u003eNikon F-mount\u003c\/strong\u003e used on Nikon DSLR cameras. To connect an M48 thread to a Z-series camera, you would need a dedicated Nikon Z-mount T-adapter, or you could use this adapter in conjunction with a Nikon FTZ adapter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes this William Optics T-mount have threads for 2\" filters?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this T-mount does not have internal threads for mounting filters inside it. Filters must be placed elsewhere in the optical train, such as in a dedicated filter drawer, filter wheel, or threaded onto the flattener\/corrector itself.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the thread pitch of the M48 connection on this T-Mount?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe M48 threads use the standard astronomical pitch of \u003cstrong\u003e0.75mm (M48x0.75)\u003c\/strong\u003e. This ensures compatibility with the vast majority of field flatteners, reducers, and other imaging accessories from William Optics and other manufacturers.\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\u003eTelescope Side Connection\u003c\/td\u003e\n\u003ctd\u003eM48 x 0.75 (Female)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Side Connection\u003c\/td\u003e\n\u003ctd\u003eNikon F-Mount Bayonet (Male)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Length\u003c\/td\u003e\n\u003ctd\u003e8.2 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\"\u003eWilliam Optics 48mm T-Mount for Nikon F\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\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":44967238009117,"sku":"WO-TM-NK-F-M48","price":54.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/William-Optics-48mm-T-Mount-for-Nikon-F-TM-NK-F-M48-1__88595.1596133297.1280.1280.jpg?v=1684339325"},{"product_id":"william-optics-m48-push-in-nosepiece-for-wo-2-diagonals-uniguide-scope","title":"William Optics M48 Push-in Nosepiece for WO 2\" Diagonals \u0026 UniGuide Scope","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConnects M48 Threaded Accessories to 2\" Push-in Focusers\u003c\/li\u003e\n\u003cli\u003eFemale M48 Threads for 2\" Filter Attachment\u003c\/li\u003e\n\u003cli\u003eAdds a Fixed 36 mm of Optical Length\u003c\/li\u003e\n\u003cli\u003eMale M48 Threads on Camera Side\u003c\/li\u003e\n\u003cli\u003eDesigned for William Optics 2\" Diagonals \u0026amp; UniGuide Scope\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\u003eWilliam Optics M48 Push-in Nosepiece for WO 2\" Diagonals \u0026amp; UniGuide Scope\u003c\/h2\u003e\n      \u003cp\u003eThe William Optics M48 Push-in Nosepiece creates a secure, all-threaded connection between your M48-format imaging gear and a standard 2\" diagonal or focuser, adding a precise 36 mm to your optical path. This adapter eliminates the potential for tilt from compression rings or set screws by providing a rigid M48 male thread for your camera and a standard 2\" push-in barrel for your telescope.\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 M48 Threading for 2\" Diagonals and UniGuide Scopes\u003c\/h3\u003e\n      \u003cp\u003eThis nosepiece is engineered to solve a common flexure point in imaging trains. Instead of relying on a simple slip-fit nosepiece, you can thread your camera or filter wheel directly onto the adapter's M48 male threads for a solid, orthogonal connection. The female M48 threads on the telescope side also allow you to mount a 2\" filter inside the barrel, placing it at the front of your imaging train.\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\u003eA Fixed 36mm Optical Path for Back Focus Calculations\u003c\/h3\u003e\n      \u003cp\u003eFor astrophotographers, every millimeter of the optical path counts. This nosepiece adds a known, fixed optical length of 36 mm, a critical value for achieving correct spacing with field flatteners and focal reducers. This precision removes the guesswork associated with variable-length adapters, ensuring you can accurately calculate and maintain your required back focus distance.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the primary use for the William Optics M48 Push-in Nosepiece?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eIts main purpose is to attach an accessory with M48 female threads, like a camera or filter wheel, to a standard 2\" push-in focuser or diagonal. It replaces standard smooth-sided nosepieces with a more secure threaded connection, which is especially important for preventing tilt with heavier imaging equipment.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 36mm optical length of this M48 nosepiece affect my imaging train?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe \u003cstrong\u003e36 mm optical length\u003c\/strong\u003e must be included in your total back focus calculation. If your focal reducer or flattener requires 55 mm of back focus, this adapter will consume 36 mm of that distance, leaving you with 19 mm for any remaining spacers and your camera's sensor depth.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I attach 2\" filters to this William Optics nosepiece?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes. The light-in side of the adapter features \u003cstrong\u003eM48 (female) threads\u003c\/strong\u003e, which is the standard threading for 2\" astronomy filters. You can thread a filter directly into the barrel before inserting it into your diagonal or focuser.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWill this M48 nosepiece work with my non-William Optics 2\" diagonal?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, most likely. While it is specifically designed for William Optics diagonals and the UniGuide scope, the male \u003cstrong\u003e2\" push-in barrel\u003c\/strong\u003e is a standard size and should fit any focuser or diagonal that accepts standard 2\" eyepieces and accessories.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the advantage of this M48 threaded nosepiece over a standard 2\" smooth-sided nosepiece?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eA threaded connection provides superior security and alignment. Key advantages include:\u003c\/p\u003e\n    \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eReduced Tilt:\u003c\/strong\u003e Eliminates the possibility of sensor tilt that can be introduced by set screws or unevenly tightened compression rings.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSecurity:\u003c\/strong\u003e Prevents your expensive camera or filter wheel from accidentally slipping out of the focuser.\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIs this William Optics adapter suitable for connecting my DSLR to my SCT's 2\" diagonal?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, this is an excellent application. You would need an M48 T-ring for your specific DSLR model. The signal path would be: SCT -\u0026gt; 2\" Diagonal -\u0026gt; This M48 Push-in Nosepiece -\u0026gt; M48 T-Ring -\u0026gt; DSLR Body. Just be sure that your SCT has enough inward focus travel to accommodate the \u003cstrong\u003e36 mm\u003c\/strong\u003e path length of the adapter plus your other components.\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\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eWO-WD-DIG2A\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eLight-In Side (Telescope)\u003c\/td\u003e\n\u003ctd\u003eM48 (female) \/ 2\" Push-in (male)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eLight-Out Side (Camera)\u003c\/td\u003e\n\u003ctd\u003eM48 (male)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eOptical Length\u003c\/td\u003e\n\u003ctd\u003e36 mm\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\"\u003eM48 Push-in Nosepiece for WO 2\" Diagonals \u0026amp; UniGuide Scope\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\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":44967238041885,"sku":"WO-WD-DIG2A","price":54.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/William-Optics-M48-Push-in-Nosepiece-for-WO-2-inch-Diagonals-UniGuide-Scope-WD-DIG2A-1__59747.1596133331.1280.1280.jpg?v=1684339332"},{"product_id":"william-optics-m48-female-to-m42-male-adapter","title":"William Optics M48 Female to M42 Male Adapter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConnects M48 Female Threads to M42 Male Threads\u003c\/li\u003e\n\u003cli\u003eAdds Only 5.3mm of Optical Path Length\u003c\/li\u003e\n\u003cli\u003eStandard 2\" Filter Thread (M48x0.75) to T-Thread (M42x0.75) Conversion\u003c\/li\u003e\n\u003cli\u003eMachined for a Rigid, Tilt-Free Connection\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\u003eWilliam Optics M48 Female to M42 Male Adapter\u003c\/h2\u003e\n\u003cp\u003eThe William Optics M48 Female to M42 Male Adapter provides a critical connection in your imaging train, stepping down from the 2-inch filter standard M48 thread to the widely used M42 T-thread. It achieves this conversion while adding only 5.3 mm of optical length, making it essential for maintaining precise back focus in demanding 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\u003eBridge M48 and M42 Gear with a Precise 5.3mm Path Length\u003c\/h3\u003e\n\u003cp\u003eThis adapter is the solution for integrating components with mismatched threads. It allows you to connect an accessory with female M48 threads, such as a field flattener or 2\" filter wheel, directly to a camera or T-ring that requires a male M42 T-thread interface.\u003c\/p\u003e\n\u003cp\u003eThe adapter's minimal 5.3 mm profile is a key design feature, consuming the smallest possible amount of your system's precious back focus. This is crucial when working with reducers or flatteners that have strict spacing requirements, ensuring you can reach focus and maintain a perfectly corrected field.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard Conversion:\u003c\/strong\u003e Seamlessly adapts accessories with female M48x0.75 threads to devices with male M42x0.75 T-threads, such as DSLR T-rings and many astronomy cameras.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMinimal Back Focus Consumption:\u003c\/strong\u003e The precisely defined 5.3 mm optical path makes it possible to integrate components without exceeding the critical back focus distance of your optical system.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSecure Connection:\u003c\/strong\u003e A rigid, threaded connection prevents the tilt and flexure that can ruin long exposures, which is crucial for maintaining a flat imaging field from edge to edge.\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 William Optics M48 to M42 Adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIts primary function is to connect an imaging train component with \u003cstrong\u003efemale M48 threads\u003c\/strong\u003e (like a field flattener or coma corrector) to a camera, T-ring, or other accessory that has \u003cstrong\u003emale M42 threads\u003c\/strong\u003e. It adds only 5.3 mm to the total optical path.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI have a William Optics flattener with M48 threads and need to connect my DSLR with an M42 T-ring. Is the WO-YE-M48-42 the right adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this is the exact application for this adapter. It will step down the M48 thread on your flattener to the M42 thread on your T-ring, consuming just 5.3 mm of back focus in the process.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 5.3 mm optical length of this adapter affect my back focus calculation?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou must subtract the \u003cstrong\u003e5.3 mm optical length\u003c\/strong\u003e from your total available back focus. For example, if your flattener requires 55 mm of back focus, installing this adapter means you now have 49.7 mm remaining for any other components in your imaging train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the William Optics M48 to M42 Adapter the same as a 2\" filter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. While it uses the same M48 thread pitch as a standard 2\" filter, this adapter is a mechanical converter, not an optical element. It changes the thread type from M48 to M42 and does not alter the light passing through it.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the WO-YE-M48-42 adapter to attach M42 accessories to my 2\" focuser drawtube?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNot directly. This adapter has a male M42 thread on the output and is designed to be threaded \u003cem\u003einto\u003c\/em\u003e an M42 female port on a camera or other accessory. To attach M42 accessories to a 2\" drawtube, you would typically need a 2\" nosepiece that terminates in an M42 male thread.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat are the thread pitches for the M48 and M42 sides of this adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile not listed in the specifications, M48 and M42 threads used in astronomy equipment almost universally use a \u003cstrong\u003e0.75mm pitch\u003c\/strong\u003e. This adapter is designed for full compatibility with standard M48x0.75 (2\" filter) threads and M42x0.75 (T-thread) standards.\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\u003eModel\u003c\/td\u003e\n\u003ctd\u003eWO-YE-M48-42\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Thread (Light-In Side)\u003c\/td\u003e\n\u003ctd\u003eM48 (female)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Thread (Light-Out Side)\u003c\/td\u003e\n\u003ctd\u003eM42 (male)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Length\u003c\/td\u003e\n\u003ctd\u003e5.3 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\"\u003eWilliam Optics M48 Female to M42 Male 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\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":44967238140189,"sku":"WO-YE-M48-42","price":21.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/William-Optics-M48-Female-to-M42-Male-Adapter-YE-M48-42-1__95751.1596133298.1280.1280.jpg?v=1684339341"},{"product_id":"william-optics-m63-female-to-2-push-in-adapter-for-p-flat6aiii","title":"William Optics M63 Female to 2\" Push-in Adapter for P-FLAT6AIII","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConnects P-FLAT6AIII Flattener to 2\" Focuser\u003c\/li\u003e\n\u003cli\u003eFemale M63 Threads for Flattener Connection\u003c\/li\u003e\n\u003cli\u003eMale 2\" Push-in Barrel for Focuser\u003c\/li\u003e\n\u003cli\u003eInternal M48 Female Threads for 2\" Filters\u003c\/li\u003e\n\u003cli\u003eProvides 46.6 mm of Optical Length\u003c\/li\u003e\n\u003cli\u003eCondition: Used\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\u003eWilliam Optics M63 Female to 2\" Push-in Adapter for P-FLAT6AIII - Used\u003c\/h2\u003e\n\u003cp\u003eThis used William Optics adapter provides the critical mechanical connection between your P-FLAT6AIII field flattener and any standard 2\" telescope focuser. It features a female M63 thread on the flattener side and contributes a precise optical length of 46.6 mm, ensuring you can achieve the correct back focus for a flat field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSecure Your P-FLAT6AIII with 46.6mm of Spacing\u003c\/h3\u003e\n\u003cp\u003eEngineered for a perfect fit, this adapter allows you to integrate the powerful P-FLAT6AIII flattener into an imaging train that terminates in a 2\" focuser. The female M63 threads attach directly to the flattener, while the male 2\" nosepiece slides securely into your telescope's drawtube. The adapter's body provides a fixed 46.6 mm of optical path length, a key distance for correct spacing.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInternal Filter Threads:\u003c\/strong\u003e The light-in side of the adapter features standard M48 female threads, allowing you to mount 2\" filters inside the optical path, directly in front of the flattener.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatibility Warning:\u003c\/strong\u003e This adapter is not compatible with William Optics \"Twenty Years Anniversary Edition\" telescopes. Please confirm your telescope model is not an Anniversary Edition before purchasing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUsed Condition:\u003c\/strong\u003e This is a pre-owned item. It is fully functional but may show minor cosmetic signs of use, such as small marks on the barrel from focuser set screws.\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 purpose of the William Optics M63 to 2\" adapter for P-FLAT6AIII?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis adapter allows you to connect the \u003cstrong\u003eWilliam Optics P-FLAT6AIII\u003c\/strong\u003e field flattener, which has an M63 male thread, to a standard \u003cstrong\u003e2\" telescope focuser\u003c\/strong\u003e. It also provides a specific \u003cstrong\u003e46.6 mm\u003c\/strong\u003e of optical length required for proper spacing.\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 my William Optics GT81 Twenty Years Anniversary Edition telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eNo.\u003c\/strong\u003e This adapter is explicitly not compatible with any of the \"Twenty Years Anniversary Edition\" telescopes from William Optics. You will need a different adapter for those specific models.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the 46.6 mm optical length of this M63 adapter account for the full back focus?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, the 46.6 mm is the contribution of this adapter alone. The P-FLAT6AIII has a total back focus requirement (typically 55 mm) that must be achieved by adding this adapter plus any other necessary spacers and camera adapters to reach the sensor plane.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use 2\" filters with this William Optics M63 to 2\" adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The adapter is equipped with standard \u003cstrong\u003eM48 female threads\u003c\/strong\u003e on the telescope side (inside the 2\" barrel), allowing you to securely mount any standard 2\" astronomy filter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I install this adapter between my William Optics Zenithstar 103 and the P-FLAT6AIII?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFirst, thread the female M63 end of the adapter onto the male M63 threads of your P-FLAT6AIII flattener until it is snug. Then, slide the 2\" male barrel of the adapter assembly into your Zenithstar 103's 2\" focuser and lock it in place with the focuser's set screws.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"Used\" condition mean for this WO-YE-M63F-2IN-PI adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\"Used\" means the adapter is fully functional but is pre-owned and will likely show cosmetic signs of previous use. This may include minor scratches or scuffs on the black anodizing or marks on the 2\" barrel from being inserted into a focuser. The threads will be clean and fully operational.\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\u003eWO-YE-M63F-2IN-PI\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCondition\u003c\/td\u003e\n\u003ctd\u003eUsed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eWilliam Optics P-FLAT6AIII Flattener\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncompatible With\u003c\/td\u003e\n\u003ctd\u003eWilliam Optics Twenty Years Anniversary Edition Telescopes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLight-In Side Connection\u003c\/td\u003e\n\u003ctd\u003e2\" Push-in (male) with internal M48 (female) filter threads\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLight-Out Side Connection\u003c\/td\u003e\n\u003ctd\u003eM63 (female)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Length\u003c\/td\u003e\n\u003ctd\u003e46.6 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\"\u003eWilliam Optics M63 Female to 2\" Push-in 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\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":44967238304029,"sku":"WO-YE-M63F-2IN-PI","price":66.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/William-Optics-M63-Female-to-2-inch-Push-in-Adapter-for-P-FLAT6AIII-YE-M63F-2IN-PI-1__95761.1596133299.1280.1280.jpg?v=1684339348"},{"product_id":"william-optics-super-high-precision-copper-t-mount-for-canon-eos-full-frame","title":"William Optics Super High Precision COPPER T-Mount for Canon EOS Full Frame","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eSolid Copper Construction for Maximum Rigidity\u003c\/li\u003e\n\u003cli\u003eM48 (2\") Female Thread for Wide-Field Correctors\u003c\/li\u003e\n\u003cli\u003eConnects to Nikon F Mount Camera Bodies\u003c\/li\u003e\n\u003cli\u003ePrecise 8.2 mm Optical Path Length\u003c\/li\u003e\n\u003cli\u003eEliminates Flexure in Heavy Imaging Trains\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\u003eWilliam Optics Super High Precision COPPER T-Mount for Canon EOS Full Frame\u003c\/h2\u003e\n\u003cp\u003eThe William Optics Super High Precision COPPER T-Mount provides a rigid, M48-threaded connection for Nikon F mount cameras with a precise optical length of 8.2 mm. This solid copper adapter is engineered to eliminate flexure and maintain thermal stability, ensuring the 8.2 mm spacing is held perfectly constant even as temperatures change.\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\u003eCopper Construction: A Zero-Flexure Foundation for Your Imaging Train\u003c\/h3\u003e\n\u003cp\u003eUnlike standard aluminum T-rings that can bend or shift under the weight of a heavy camera and filter wheel, this William Optics T-mount is machined from solid copper. This material choice provides a significant increase in rigidity, preventing tilt and ensuring your camera sensor remains perfectly orthogonal to the optical axis for sharp, round stars across the entire frame.\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 Threading for Full-Frame Nikon F Mount Cameras\u003c\/h3\u003e\n\u003cp\u003eThis adapter features the larger M48x0.75 thread standard on the telescope side, not the smaller M42 T-thread. This wider aperture is essential for full-frame Nikon F mount cameras, as it prevents vignetting by providing an unobstructed light cone to the large sensor. It creates a secure, wide-format connection to modern field flatteners and reducers.\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\u003eCopper vs. Aluminum T-Rings: Why 8.2mm of Stability Matters\u003c\/h3\u003e\n\u003cp\u003eWhile an aluminum T-ring is lighter, copper offers superior thermal characteristics for astrophotography. As ambient temperature drops during an imaging session, aluminum contracts more significantly, which can alter the critical 8.2 mm backfocus and cause stars to lose their sharp focus. The thermal stability of copper minimizes this contraction, keeping your focus locked and your data pristine throughout the night.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompetitor Advantage:\u003c\/strong\u003e Standard aluminum T-rings are lighter and less expensive.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWilliam Optics Advantage:\u003c\/strong\u003e The copper construction provides superior thermal stability and flexure resistance, protecting image quality in demanding conditions.\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\"\u003eWhy is this William Optics T-Mount made of copper?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe copper construction provides superior thermal stability and rigidity compared to standard aluminum. This prevents focus shift from temperature changes and eliminates flexure in the imaging train, which is critical for sharp, round stars with heavy camera setups.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the benefit of the M48 thread on this T-mount for my Nikon F camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe larger M48 (2-inch) thread provides a wider, unvignetted light path to full-frame sensors. This is a significant improvement over standard M42 T-threads, which can cause dark corners in images taken with full-frame cameras like those using the Nikon F mount.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the 8.2mm optical length of this William Optics mount work with my flattener?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 8.2mm optical length is designed to be part of a standard 55mm backfocus calculation. Always check the requirements for your specific flattener or reducer, but this T-mount is designed to integrate cleanly into common M48-threaded imaging trains.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eThe product title says Canon EOS, but the specs say Nikon F. Which is it for?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis specific model connects to a \u003cstrong\u003eNikon F camera mount\u003c\/strong\u003e. It is designed to adapt M48-threaded accessories to Nikon F-mount camera bodies. William Optics produces different models for various camera brands.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the copper construction of the William Optics T-Mount help on a cold night imaging the Orion Nebula (M42)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eDuring a long imaging session of M42, temperatures can drop significantly. The copper's thermal stability means it won't contract as much as aluminum, keeping the critical 8.2mm spacing constant and your focus locked. This prevents stars from bloating or drifting out of focus over several hours.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the extra weight of the copper T-mount matter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile copper is heavier than aluminum, the small size of the T-mount means the weight difference is minimal and will not affect the balance of most telescope setups. The added rigidity and stability are a worthwhile trade-off for the slight increase in weight.\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\u003eTelescope Side Connection\u003c\/td\u003e\n\u003ctd\u003eM48 (female)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Side Connection\u003c\/td\u003e\n\u003ctd\u003eNikon F Camera Mount\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Length\u003c\/td\u003e\n\u003ctd\u003e8.2 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\"\u003eWilliam Optics Super High Precision COPPER T-Mount\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\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":44967238402333,"sku":"WO-YE-TR-BR48-C","price":149.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/William-Optics-Super-High-Precision-COPPER-T-Mount-for-Canon-EOS-Full-Frame-YE-TR-BR48-C-1__86614.1596133300.1280.1280.jpg?v=1684339355"},{"product_id":"william-optics-super-high-precision-copper-t-mount-for-nikon-full-frame","title":"William Optics Super High Precision COPPER T-Mount for Nikon Full Frame","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eSolid Copper Construction for Maximum Rigidity\u003c\/li\u003e\n\u003cli\u003eM48 x 0.75 Female Thread for Wide-Field Correctors\u003c\/li\u003e\n\u003cli\u003eDesigned for Nikon Full-Frame DSLR and Mirrorless Cameras\u003c\/li\u003e\n\u003cli\u003ePrevents Vignetting on Large Sensors\u003c\/li\u003e\n\u003cli\u003ePrecision Machining for Secure, Flex-Free Connection\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\u003eWilliam Optics Super High Precision COPPER T-Mount for Nikon Full Frame\u003c\/h2\u003e\n\u003cp\u003eThe William Optics Super High Precision COPPER T-Mount connects your Nikon full-frame camera to any M48 (0.75 pitch) threaded flattener or field corrector, providing the large clear aperture required to prevent vignetting. Its solid copper body offers superior rigidity compared to standard aluminum T-rings, ensuring perfect optical alignment for demanding imaging trains that utilize M48 threads.\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\u003eSolid Copper Construction: Rigidity Beyond Aluminum\u003c\/h3\u003e\n\u003cp\u003eUnlike standard T-rings made from lightweight aluminum, this William Optics T-mount is machined from a solid piece of copper. This deliberate material choice provides a significant increase in rigidity, eliminating the potential for flexure between your camera and the rest of your optical train. For imagers using heavy filter wheels or off-axis guiders, this robust connection ensures that sensor tilt is not introduced by the adapter itself.\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 Clear Aperture: Eliminating Vignetting on Full-Frame Sensors\u003c\/h3\u003e\n\u003cp\u003eStandard T-rings use a smaller M42 thread, which acts as a bottleneck and darkens the corners of images captured with full-frame sensors. The William Optics T-mount utilizes the larger M48 thread format, ensuring the light cone from your flattener or reducer fully illuminates your Nikon's sensor from edge to edge. This is essential for creating flat, evenly illuminated astrophotos without the need for aggressive cropping.\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\u003eWilliam Optics Copper M48 vs. Standard Aluminum M42 T-Rings\u003c\/h3\u003e\n\u003cp\u003eChoosing the right T-ring is a critical, often overlooked, part of the imaging train. A standard aluminum M42 T-ring is sufficient for smaller APS-C sensors, but it presents two key limitations for full-frame users that the William Optics Copper M48 T-mount solves.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard Aluminum T-Ring's Limitation:\u003c\/strong\u003e Aluminum is light but can flex under the load of a heavy camera and accessories, introducing sensor tilt and elongated stars in the corners of your images.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWilliam Optics Copper T-Mount's Advantage:\u003c\/strong\u003e Copper is a much stiffer material, providing a rock-solid, flex-free connection that maintains perfect optical alignment throughout an imaging session, even as temperature changes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard M42 Thread's Limitation:\u003c\/strong\u003e The smaller M42 diameter physically vignettes the light cone, preventing it from covering a full-frame sensor and causing dark corners in your final images.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWilliam Optics M48 Thread's Advantage:\u003c\/strong\u003e The M48 thread provides a wide, unobstructed path for light, guaranteeing full illumination for 35mm format sensors and enabling you to use the entire frame of your Nikon camera.\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\"\u003eWhy use a copper T-ring like this William Optics model instead of a standard aluminum one?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA \u003cstrong\u003ecopper T-ring\u003c\/strong\u003e offers significantly higher rigidity than an aluminum one. This prevents flexure in the imaging train, which can cause sensor tilt and distorted stars, especially when using heavy cameras or accessories like filter wheels. The added mass and thermal properties also contribute to a more stable connection.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the advantage of the M48 thread on this T-mount for my Nikon D850?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe full-frame sensor in your Nikon D850 requires a large, fully-illuminated image circle to avoid vignetting (darkened corners). Standard M42 T-rings are too narrow and will constrict the light path. The \u003cstrong\u003eM48 thread\u003c\/strong\u003e on this William Optics T-mount provides a wider clear aperture, ensuring the entire sensor is illuminated for clean, flat frames.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this William Optics T-mount connect directly to my telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this T-mount is designed to connect your Nikon camera to a field flattener, reducer, or other corrector that has male M48 x 0.75 threads. You will thread this T-mount onto your corrector, and then the entire assembly connects to your telescope's focuser.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the copper material add a lot of weight to the imaging train?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, copper is denser than aluminum, so this T-mount is heavier than a standard ring. However, this additional weight is a key part of its stability. The trade-off is a small increase in weight for a significant reduction in mechanical flexure, which is critical for high-resolution imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does this T-mount help when imaging large targets like the Andromeda Galaxy (M31) with a full-frame sensor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhen framing a large object like the Andromeda Galaxy (M31), you need to use your entire full-frame sensor. An M42 T-ring would cause vignetting, forcing you to crop the image and lose parts of the galaxy's faint outer arms. The \u003cstrong\u003eWilliam Optics M48 T-mount\u003c\/strong\u003e ensures the whole field is usable, allowing you to capture M31 in its entirety with even illumination.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the William Optics M48 T-mount compatible with Nikon Z-series mirrorless cameras?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis T-mount is designed for the standard Nikon F-mount. To use it with a Nikon Z-series mirrorless camera, you will need to use the \u003cstrong\u003eNikon FTZ (F-mount to Z-mount) adapter\u003c\/strong\u003e between your camera body and this T-mount.\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\u003eWO-YE-TR-BR48-N\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Mount\u003c\/td\u003e\n\u003ctd\u003eNikon F-Mount\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\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eCopper\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSensor Compatibility\u003c\/td\u003e\n\u003ctd\u003eFull Frame \/ APS-C\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\"\u003eWilliam Optics Super High Precision COPPER T-Mount for Nikon\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\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":44967238435101,"sku":"WO-YE-TR-BR48-N","price":149.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/William-Optics-Super-High-Precision-COPPER-T-Mount-for-Nikon-Full-Frame-YE-TR-BR48-N-1__02819.1596133300.1280.1280.jpg?v=1684339362"},{"product_id":"william-optics-48mm-t-mount-for-sony-e-black","title":"William Optics 48mm T-Mount for Sony E - Black","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConnects Sony E-mount cameras to M48 accessories\u003c\/li\u003e\n\u003cli\u003eProvides a precise 36.7 mm optical length\u003c\/li\u003e\n\u003cli\u003eM48 (female) threads reduce vignetting on large sensors\u003c\/li\u003e\n\u003cli\u003eDurable, black anodized aluminum construction\u003c\/li\u003e\n\u003cli\u003eEngineered for William Optics optical systems\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\u003eWilliam Optics 48mm T-Mount for Sony E - Black\u003c\/h2\u003e\n\u003cp\u003eSecurely connect your Sony E-mount camera to your telescope's M48 corrector or flattener with the William Optics 48mm T-Mount for Sony E. This adapter provides a precise optical length of 36.7 mm, critical for achieving a perfectly flat field with William Optics imaging systems. Its female M48 threads create a wide, unvignetted light path directly to your camera's sensor, eliminating the bottleneck caused by older M42 T-rings.\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 Threading: A Wider, 36.7mm Path for Full-Frame Sony Sensors\u003c\/h3\u003e\n\u003cp\u003eThis T-mount is engineered specifically for modern astrophotography setups that utilize full-frame or large APS-C sensors, common in the Sony Alpha camera line. The M48 (2-inch filter) thread provides a larger clear aperture than the standard M42 T-thread, ensuring the corrected light cone from your flattener fully illuminates the sensor without clipping the corners of the frame.\u003c\/p\u003e\n\u003cp\u003eThe fixed 36.7 mm optical length is not arbitrary; it is calculated to achieve the exact back focus required by many William Optics flatteners and reducers when paired with a Sony E-mount camera. This single-piece design removes the guesswork and potential for tilt introduced by using multiple extension tubes, resulting in sharper stars across your entire image.\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 vs. M42 T-Rings: The 6mm Difference for Full-Frame Imaging\u003c\/h3\u003e\n\u003cp\u003eFor decades, the M42 \"T-ring\" was the standard for connecting cameras to telescopes. However, its 42mm clear aperture acts as a choke point for the light path, causing significant vignetting (darkened corners) on sensors larger than the APS-C format. A full-frame sensor simply cannot be fully illuminated through such a narrow opening.\u003c\/p\u003e\n\u003cp\u003eThe William Optics 48mm T-Mount solves this problem. By expanding the connection thread to M48, it creates a wider gateway for light, preserving the field illumination your telescope's corrector was designed to deliver. If you are imaging with a full-frame Sony camera, an M48 T-mount is essential for maximizing the usable area of your sensor and capturing clean, evenly illuminated frames.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the purpose of the William Optics 48mm T-Mount for Sony E?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis T-mount serves one primary function: to connect a \u003cstrong\u003eSony E-mount camera\u003c\/strong\u003e (such as those in the Alpha series) to a telescope flattener, reducer, or other accessory that uses a male \u003cstrong\u003eM48x0.75 thread\u003c\/strong\u003e. It also sets the camera sensor at a precise \u003cstrong\u003e36.7 mm\u003c\/strong\u003e distance from the accessory's threads, which is critical for achieving correct back focus.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy should I choose this M48 T-Mount over a standard M42 T-ring for my Sony A7?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA standard M42 T-ring has a smaller opening that will cause significant vignetting (darkened corners) on the full-frame sensor of a Sony A7 series camera. The larger \u003cstrong\u003eM48 thread\u003c\/strong\u003e on this William Optics mount provides a wider light path, ensuring the entire sensor is evenly illuminated, which is crucial for high-quality, wide-field astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 36.7 mm optical length of this T-Mount important?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it is extremely important. Most field flatteners and reducers require a specific back focus distance (typically 55mm) to produce sharp stars across the entire field. Sony E-mount cameras have a flange distance of 18mm. This adapter's \u003cstrong\u003e36.7 mm length\u003c\/strong\u003e, when added to the camera's 18mm, totals 54.7mm—very close to the 55mm standard. It is specifically designed to achieve perfect spacing with many William Optics correctors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhich William Optics telescopes is this 48mm T-Mount designed for?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis T-mount is compatible with any William Optics telescope that uses a field flattener or reducer terminating in a male M48 thread. This includes popular models such as:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eRedCat, WhiteCat, and SpaceCat series refractors\u003c\/li\u003e\n\u003cli\u003eFluorostar (FLT) series with their corresponding flatteners\u003c\/li\u003e\n\u003cli\u003eGran Turismo (GT) series with their corresponding flatteners\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eAlways check your specific flattener's documentation to confirm it requires an M48 connection and is compatible with the resulting back focus.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this T-mount work for imaging the Andromeda Galaxy (M31) with my full-frame Sony camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this is an ideal accessory for that exact scenario. The Andromeda Galaxy is a very large target, and a full-frame sensor is needed to capture it fully with many refractors. Using this \u003cstrong\u003e48mm T-Mount\u003c\/strong\u003e ensures that the faint outer spiral arms of M31 are not dimmed or cut off by vignetting, which would almost certainly happen with a smaller M42 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 the WO 48mm T-Mount to my imaging train?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFirst, remove the lens from your Sony E-mount camera. Align the indicator dot on the T-mount with the dot on your camera's bayonet mount and twist to lock it in place, just like a standard lens. Then, you can thread the entire camera and T-mount assembly directly onto the male M48 threads of your telescope's 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\u003eConnection to Telescope\u003c\/td\u003e\n\u003ctd\u003eM48 x 0.75 Female Thread\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnection to Camera\u003c\/td\u003e\n\u003ctd\u003eSony E-Mount (NEX\/Alpha)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Length \/ Back Focus Contribution\u003c\/td\u003e\n\u003ctd\u003e36.7 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\"\u003eWilliam Optics 48mm T-Mount for Sony E\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\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":44967238467869,"sku":"WO-TM-SN-E-M48","price":76.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/William-Optics-48mm-T-Mount-for-Sony-E-Space-Gray-YE-TR-M48ET-TG-1__11108.1596133301.1280.1280.jpg?v=1684339370"},{"product_id":"william-optics-micro-4-3-48mm-t-mount-for-olympus-space-gray","title":"William Optics Micro 4\/3 48mm T-Mount for Olympus - Black","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConnects M48 Correctors to Olympus Micro 4\/3 Cameras\u003c\/li\u003e\n\u003cli\u003eFixed 35.6 mm Optical Length for Precise Back Focus\u003c\/li\u003e\n\u003cli\u003eLight-In Connection: M48 (Female) Thread\u003c\/li\u003e\n\u003cli\u003eLight-Out Connection: Olympus Micro 4\/3 Bayonet Mount\u003c\/li\u003e\n\u003cli\u003eDurable Single-Piece 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\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\u003eWilliam Optics Micro 4\/3 48mm T-Mount for Olympus - Black\u003c\/h2\u003e\n      \u003cp\u003eThe William Optics Micro 4\/3 48mm T-Mount provides a direct, secure connection from any M48 female thread to your Olympus or Panasonic Micro 4\/3 camera body. Its single-piece design is machined to a precise optical length of 35.6 mm, achieving the ideal standard 55 mm total back focus requirement when paired with a Micro 4\/3 camera body.\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\u003ePrecision Spacing: Achieving 55mm Total Back Focus\u003c\/h3\u003e\n      \u003cp\u003eA field flattener or reducer-flattener only delivers sharp, point-like stars across the entire frame when the camera sensor is placed at a specific distance from its rear lens element. This William Optics T-Mount provides the exact 35.6 mm optical path length that, when combined with the internal flange focal distance of a Micro 4\/3 camera, yields the total 55 mm back focus needed for William Optics refractors.\u003c\/p\u003e\n      \u003cp\u003eUsing this single, rigid adapter removes the guesswork and potential for tilt. The result is a mechanically solid imaging train and a flat, fully corrected field of view, letting you get the most out of your William Optics telescope.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the primary purpose of the William Optics M48 T-Mount for Micro 4\/3?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThis adapter connects a field flattener or other corrector with a standard \u003cstrong\u003eM48 (2-inch filter) thread\u003c\/strong\u003e to any camera body that uses the \u003cstrong\u003eOlympus\/Panasonic Micro 4\/3 mount\u003c\/strong\u003e. Its main function is to provide an optical length of \u003cstrong\u003e35.6 mm\u003c\/strong\u003e, reaching a total system back focus of 55 mm once attached to your Micro 4\/3 camera.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is the 35.6 mm optical length of this William Optics T-Mount critical for imaging?\u003c\/h3\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eField flatteners are designed to work at a specific distance from the camera sensor (typically 55 mm total). If the spacing is incorrect, you will see elongated or out-of-focus stars in the corners of your images. Combined with a Micro 4\/3 camera sensor distance, this adapter delivers the exact \u003cstrong\u003e55 mm total back focus\u003c\/strong\u003e needed to produce sharp stars from edge to edge.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eI have a William Optics RedCat 51. Is this the right T-Mount for my Olympus OM-D E-M1 camera?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, this is the correct adapter. The RedCat 51 has an integrated flattener that terminates in an M48 thread. The William Optics M48 T-Mount for Micro 4\/3 will connect directly to the telescope and your Olympus camera, establishing the full 55 mm back focus for a fully corrected image.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this William Optics M48 T-Mount with a non-William Optics telescope?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, provided your telescope's flattener has an M48 output thread and requires a standard \u003cstrong\u003e55 mm back focus\u003c\/strong\u003e when paired with a Micro 4\/3 camera body. Always verify the back focus requirement of your specific flattener before imaging.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the William Optics M48 T-Mount cause vignetting with my Micro 4\/3 camera?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eNo. The M48 thread provides a wide, fully illuminated light cone that is significantly larger than the sensor used in Micro 4\/3 cameras. This ensures there is no vignetting or light fall-off at the edges of the frame caused by the adapter itself.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWill the William Optics M48 T-Mount work with my ZWO cooled astronomy camera?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eNo. This adapter features a bayonet mount for DSLR and mirrorless cameras like those from Olympus and Panasonic. It will not attach to a cooled astronomy camera, which typically uses direct threaded connections (like M42 or M48).\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\u003eLight-In Side\u003c\/td\u003e\n\u003ctd\u003eM48 (female)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eLight-Out Side\u003c\/td\u003e\n\u003ctd\u003eOlympus Micro 4\/3 Camera Mount\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eOptical Length\u003c\/td\u003e\n\u003ctd\u003e35.6 mm (55 mm total back focus with Micro 4\/3 camera)\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\"\u003eWilliam Optics Micro 4\/3 48mm T-Mount\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\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":44967238533405,"sku":"WO-TM-MFT-M48","price":65.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/TM-MFT-M48-1.jpg?v=1714747777"},{"product_id":"william-optics-48mm-t-mount-for-canon","title":"William Optics 48mm T-Mount for Canon","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConnects M48 (2-inch) Threaded Correctors to Canon EOS Cameras\u003c\/li\u003e\n\u003cli\u003eWide M48 Aperture Eliminates Vignetting on Full-Frame Sensors\u003c\/li\u003e\n\u003cli\u003eAdds a Precise 10.6 mm of Optical Length to the Imaging Train\u003c\/li\u003e\n\u003cli\u003eMachined from Black Anodized Aluminum\u003c\/li\u003e\n\u003cli\u003eFemale M48x0.75 Threading\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\u003eWilliam Optics 48mm T-Mount for Canon\u003c\/h2\u003e\n\u003cp\u003eThe William Optics 48mm T-Mount for Canon is the professional-grade solution for connecting your Canon EOS camera to a modern 2-inch imaging train, featuring a wide M48 female thread to prevent vignetting on full-frame sensors. It adds a precise 10.6 mm to the optical path, a critical constant for calculating the exact spacing required by field flatteners and reducers to achieve sharp stars across the entire frame.\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 \u0026amp; 10.6mm Spacing: The Solution for Full-Frame Canon Imaging\u003c\/h3\u003e\n\u003cp\u003eThis adapter solves the most common bottleneck in DSLR astrophotography: the restrictive M42 \"T-thread.\" By using the larger M48 x 0.75 female thread, this T-mount provides a wider, un-obstructed light path from your flattener or reducer to your camera's sensor. This is essential for owners of full-frame Canon cameras, as it eliminates the vignetting (darkened corners) that M42 adapters often create.\u003c\/p\u003e\n\u003cp\u003eThe fixed optical length of 10.6 mm is designed for precision. When paired with a Canon EOS camera body, which has a native flange focal distance of 44mm, this adapter brings your total back focus to 54.6mm. This is within a millimeter of the 55mm standard required by most field correctors, allowing you to achieve a flat field with minimal or no additional spacers.\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\u003eWilliam Optics M48 vs. Standard M42 T-Ring: A Wider Path to the Sensor\u003c\/h3\u003e\n\u003cp\u003eWhile standard M42 T-rings are common, they were designed for older film formats and can act as a choke point for the light cone in a modern imaging setup. The William Optics M48 T-Mount is purpose-built to overcome this limitation.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard M42 T-Ring:\u003c\/strong\u003e The smaller 42mm thread diameter often vignettes the corners of full-frame and even some large APS-C sensors, forcing you to crop your final images or spend time correcting gradients in post-processing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWilliam Optics M48 T-Mount:\u003c\/strong\u003e The larger 48mm thread diameter provides a clear aperture that fully illuminates sensors up to 44mm diagonally. This ensures your expensive full-frame sensor receives all the light your telescope collects, resulting in brighter, evenly illuminated frames from edge to edge.\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 advantage of the William Optics M48 T-Mount over a standard M42 T-ring for my Canon EOS camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary advantage is the larger \u003cstrong\u003eM48 thread diameter\u003c\/strong\u003e, which prevents vignetting (darkening of the corners) on full-frame and large APS-C camera sensors. A standard M42 T-ring can physically block some of the light cone, while the M48 mount ensures the entire sensor is evenly illuminated.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this M48 T-Mount work with my William Optics refractor and flattener?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this T-mount is specifically designed to integrate with William Optics flatteners and other correctors that output an M48 male thread and require approximately 55mm of back focus. The \u003cstrong\u003e10.6 mm optical length\u003c\/strong\u003e of this adapter is a key part of that calculation when used with a Canon EOS camera body.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I calculate back focus using the 10.6 mm optical length of this William Optics T-mount?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou add the adapter's optical length to your camera's flange distance. For a Canon EOS camera, the flange distance is 44mm. So, the total distance from the T-mount's M48 thread to your sensor will be \u003cstrong\u003e44mm + 10.6mm = 54.6mm\u003c\/strong\u003e. You can then use thin M48 spacers to reach the exact back focus required by your specific flattener or reducer, which is typically 55mm.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs this adapter compatible with both full-frame and APS-C Canon EOS cameras?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it is compatible with any camera that uses the \u003cstrong\u003eCanon EOS mount\u003c\/strong\u003e. While it provides the most significant benefit for full-frame cameras by preventing vignetting, it works perfectly with APS-C models as well, providing a secure, wide-aperture connection to your telescope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use 2-inch filters with the William Optics M48 T-Mount?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis adapter itself does not have threads for a filter. Filters should be placed earlier in the imaging train, typically by threading them into a dedicated filter drawer, a filter wheel, or directly onto the nosepiece of the flattener\/reducer before you attach this T-mount.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this adapter let me attach my Canon EOS camera to a Schmidt-Cassegrain telescope for imaging the Orion Nebula (M42)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, provided your Schmidt-Cassegrain (SCT) is equipped with a focal reducer or flattener that terminates in male \u003cstrong\u003eM48 threads\u003c\/strong\u003e. You would thread this T-mount onto the corrector, and then attach your Canon EOS camera to the bayonet mount to image large targets like the Orion Nebula (M42).\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\u003eTelescope Side Connection\u003c\/td\u003e\n\u003ctd\u003eM48 x 0.75 Female Thread\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Side Connection\u003c\/td\u003e\n\u003ctd\u003eCanon EOS Camera Mount\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Length\u003c\/td\u003e\n\u003ctd\u003e10.6 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\"\u003eWilliam Optics 48mm T-Mount for Canon EOS\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\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":44967253475613,"sku":"WO-TM-CN-EOS-M48","price":54.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/William-Optics-48mm-T-Mount-for-Canon-TM-CN-EOS-M48-1__29196.1596133298.1280.1280.jpg?v=1684339552"},{"product_id":"william-optics-48mm-t-mount-for-fuji-fx-black","title":"William Optics 48mm T-Mount for Fuji FX - Black","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConnects M48-threaded correctors to Fujifilm X-mount (Fuji FX) mirrorless cameras\u003c\/li\u003e\n\u003cli\u003eWide 48mm aperture minimizes vignetting on APS-C sensors\u003c\/li\u003e\n\u003cli\u003ePrecisely machined 37mm optical length achieves exact 55mm back focus when combined with camera\u003c\/li\u003e\n\u003cli\u003eCNC machined 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\u003eWilliam Optics 48mm T-Mount for Fuji FX Mirrorless\u003c\/h2\u003e\n\u003cp\u003eThe William Optics 48mm T-Mount for Fuji FX Mirrorless provides a rigid, wide-aperture connection from your telescope's M48-threaded corrector. Consuming exactly 37 mm of optical path, it works seamlessly with your camera body to achieve the standard 55 mm back focus for flat-field astrophotography.\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: Full Aperture Illumination for Fuji X-Series Sensors\u003c\/h3\u003e\n\u003cp\u003eThis T-Mount features a female M48x0.75 thread, which provides a significantly larger clear aperture than the older M42 T-ring standard. This wider opening is essential for illuminating the sensor in Fujifilm X-series cameras, preventing the mechanical vignetting that can darken the corners of your images.\u003c\/p\u003e\n\u003cp\u003eBy connecting directly to the wide-format flatteners, reducers, and correctors common on high-end imaging refractors, this adapter ensures that the maximum amount of corrected light reaches your sensor. The result is a more evenly illuminated field, reducing the need for aggressive flat-frame correction in post-processing.\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 Correct Back Focus: Built for Standard 55mm Back Focus\u003c\/h3\u003e\n\u003cp\u003eEvery field flattener or reducer requires a precise distance to the camera sensor to deliver sharp, coma-free stars across the entire frame. This William Optics T-Mount is engineered with an exact optical length of 37 mm, which combines with the Fujifilm X mount's 17.7 mm flange distance (plus sensor glass optical path) to achieve the standard 55 mm total back focus directly—no additional spacers required.\u003c\/p\u003e\n\u003cp\u003eBy delivering the exact 55 mm optical path out of the box when attached to your camera, this adapter removes the guesswork and ensures your entire imaging system is performing at its peak optical potential.\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 advantage of this William Optics M48 T-Mount over a standard M42 T-ring for my Fuji FX camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary advantage is the larger \u003cstrong\u003eM48 (48mm)\u003c\/strong\u003e thread diameter compared to the 42mm diameter of a standard T-ring. This wider aperture prevents the adapter itself from clipping the light cone, ensuring maximum light transmission across your camera sensor without vignetting.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 37mm optical length of the William Optics T-Mount achieve 55mm back focus?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhen combined with a Fuji X-mount camera body (which has a 17.7mm sensor flange distance), the adapter's 37mm optical length brings the total system distance to exactly 55mm directly from your M48-threaded corrector without requiring additional spacers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs this William Optics T-Mount compatible with Fuji GFX medium format or older SLR cameras?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. This T-Mount is designed specifically for the \u003cstrong\u003eFujifilm X mount\u003c\/strong\u003e used on Fuji FX crop-sensor mirrorless cameras (X-T, X-PRO, X-E, X-A, X-H series). It will not physically attach to GFX medium format cameras or older film\/DSLR SLR mounts.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the William Optics M48 T-Mount for Fuji FX accept 2-inch filters?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis adapter itself does not have threads to mount a filter inside it. However, its M48 female thread is designed to connect to a filter wheel, filter drawer, or corrector that accepts standard 2-inch (M48) filters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this 37mm T-Mount work with a Celestron EdgeHD 8\" and its 0.7x reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, but you will need additional extension. The Celestron 0.7x reducer for the EdgeHD 8\" requires 146mm of back focus. Since this adapter and your camera total 55mm, you would need an additional 91mm of M48 extension tubes between the reducer and this T-Mount to reach the required 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\u003eTelescope Side Connection\u003c\/td\u003e\n\u003ctd\u003eM48 (Female)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Side Connection\u003c\/td\u003e\n\u003ctd\u003eFujifilm X Mount (Fuji FX)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Length\u003c\/td\u003e\n\u003ctd\u003e37 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\"\u003eWilliam Optics 48mm T-Mount for Fuji FX Mirrorless\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\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":44967890682141,"sku":"WO-TM-FJ-X-M48","price":76.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/William-Optics-48mm-T-Mount-Fuji-X-Black-1__09584.1617667880.1280.1280.jpg?v=1684346572"},{"product_id":"william-optics-48mm-t-mount-for-pentax-k-black","title":"William Optics 48mm T-Mount for Pentax K - Black","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConnects Pentax K-Mount Cameras to M48 Accessories\u003c\/li\u003e\n\u003cli\u003ePrecisely machined 9.3 mm optical length achieves exact 55mm back focus when combined with camera\u003c\/li\u003e\n\u003cli\u003eM48 (Female) Thread for Wide-Field Correctors and Reducers\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\u003eWilliam Optics 48mm T-Mount for Pentax K - Black\u003c\/h2\u003e\n\u003cp\u003eThe William Optics 48mm T-Mount for Pentax K cameras provides a secure, direct-thread connection to modern flatteners and reducers. Consuming exactly 9.3 mm of optical path, it works seamlessly with your camera body to achieve the standard 55 mm back focus for flat-field astrophotography.\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 Spacing: Built for Standard 55mm Back Focus\u003c\/h3\u003e\n\u003cp\u003eThis T-mount directly connects your Pentax K camera body to any accessory with a male M48x0.75 thread, the standard for full-frame-capable field flatteners and reducers. The adapter's fixed 9.3 mm optical length combines directly with a Pentax K camera's ~45.5 mm flange focal distance to yield the required 55 mm total back focus (9.3 mm + 45.5 mm = 54.8 mm ~ 55 mm) directly—no additional spacers required.\u003c\/p\u003e\n\u003cp\u003eBy delivering the exact 55 mm optical path out of the box when attached to your camera, this adapter removes guesswork and eliminates potential spacing errors that can introduce field curvature or other optical aberrations.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide M48 Aperture:\u003c\/strong\u003e The larger 48mm diameter helps prevent vignetting on larger camera sensors compared to standard 42mm T-rings, ensuring more even illumination across the frame.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRigid Threaded Connection:\u003c\/strong\u003e By threading directly onto your corrector, this T-mount creates a solid, flex-free connection that is essential for maintaining optical alignment throughout a long imaging session.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable Construction:\u003c\/strong\u003e Machined from black anodized aluminum, the adapter is built to withstand repeated use in the field while minimizing stray light reflections within your optical 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 William Optics 48mm T-Mount for Pentax K used for?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis T-mount allows you to securely attach a \u003cstrong\u003ePentax K-mount camera\u003c\/strong\u003e to a field flattener, focal reducer, or other imaging accessory with male \u003cstrong\u003eM48x0.75 threads\u003c\/strong\u003e, establishing the standard 55 mm total back focus required for flat-field astrophotography without needing extra spacers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 9.3mm optical length of this T-Mount achieve 55mm back focus?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhen combined with a Pentax K-mount camera body (which has a ~45.5 mm flange focal distance), the adapter's 9.3 mm optical length brings the total system distance to 54.8 mm (~55 mm) directly from your M48-threaded corrector without requiring additional spacers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy should I use this William Optics M48 T-Mount instead of a standard M42 T-ring?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAn \u003cstrong\u003eM48 T-Mount\u003c\/strong\u003e provides a wider clear aperture than a standard M42 T-ring. This is critical for preventing vignetting (darkening of the corners) when using cameras with larger sensors, such as full-frame or APS-C models, ensuring your entire sensor is evenly illuminated by the telescope's optics.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this T-Mount work with my William Optics RedCat 51 and Pentax K-1 camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The RedCat 51's imaging train terminates in a male M48 thread. This T-Mount connects directly to it, allowing you to attach your Pentax K-1 at the correct 55 mm back focus distance directly without any additional extension tubes or spacers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the William Optics T-Mount compatible with all Pentax K-mount cameras?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this T-mount is designed to be compatible with any camera that uses the \u003cstrong\u003ePentax K bayonet mount\u003c\/strong\u003e, including both modern DSLRs (like the K-1, K-3, K-70) and older film cameras.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes this William Optics T-mount include a filter holder?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this is a simple mechanical adapter. It does not have threads or a slot to accommodate filters. If you need to use filters, they must be placed elsewhere in your imaging train, such as in a separate filter drawer or filter wheel placed before the T-mount.\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\u003eLight-In Side\u003c\/td\u003e\n\u003ctd\u003eM48 (female)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLight-Out Side\u003c\/td\u003e\n\u003ctd\u003ePentax K Camera Mount\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Length\u003c\/td\u003e\n\u003ctd\u003e9.3 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\"\u003eWilliam Optics 48mm T-Mount for Pentax K - Black\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\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":44967890714909,"sku":"WO-TM-PT-K-M48","price":54.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/William-Optics-48mm-T-Mount-Pentax-K-Black-1__98948.1617667452.1280.1280.jpg?v=1684346577"},{"product_id":"william-optics-48mm-t-mount-for-nikon-z","title":"William Optics 48mm T-Mount for Nikon Z","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConnects M48 accessories to Nikon Z-mount mirrorless cameras\u003c\/li\u003e\n\u003cli\u003ePrecisely machined 38.4 mm optical length achieves exact 55mm back focus when combined with camera\u003c\/li\u003e\n\u003cli\u003eM48 (female) threads offer a wide, unvignetted light path\u003c\/li\u003e\n\u003cli\u003eSolid, single-piece metal construction for flexure-free imaging\u003c\/li\u003e\n\u003cli\u003eDesigned for William Optics flatteners and reducers\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\u003eWilliam Optics 48mm T-Mount for Nikon Z\u003c\/h2\u003e\n\u003cp\u003eThe William Optics 48mm T-Mount for Nikon Z provides a secure, direct connection from any M48 x 0.75 female thread to a Nikon Z-mount mirrorless camera body. Consuming exactly 38.4 mm of optical path, it works seamlessly with your camera body to achieve the standard 55 mm back focus for flat-field astrophotography.\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 T-Mount for Nikon Z: Built for Standard 55mm Back Focus\u003c\/h3\u003e\n\u003cp\u003eThis T-Mount is engineered to place your Nikon Z sensor at the exact back focus distance required by your William Optics flattener or reducer. The precise 38.4 mm optical length combines directly with the Nikon Z mount's 16 mm flange focal distance (plus sensor glass optical path) to yield the required 55 mm total back focus directly—no additional spacers required.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSolid Mechanical Connection:\u003c\/strong\u003e Machined from a single piece of metal, this mount creates a rigid, flex-free connection between your camera and telescope, preventing tilt that can ruin an otherwise perfect image.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull-Frame Illumination:\u003c\/strong\u003e The M48 threading provides a wide light path necessary to fully illuminate large mirrorless sensors without clipping the corners of the image, a common problem with smaller M42 adapters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlug-and-Play Spacing:\u003c\/strong\u003e By delivering the exact 55 mm optical path out of the box when attached to your camera, this adapter removes all guesswork and guarantees peak optical performance without extra extension tubes.\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 purpose of the William Optics 48mm T-Mount for Nikon Z?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis T-Mount serves as a specialized adapter to securely connect a \u003cstrong\u003eNikon Z-mount mirrorless camera\u003c\/strong\u003e to a telescope's flattener, reducer, or other accessory that uses standard \u003cstrong\u003eM48 (female) threads\u003c\/strong\u003e. When attached to your camera body, it establishes the standard 55 mm total back focus required for flat-field astrophotography without needing extra spacers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 38.4mm optical length of this William Optics T-Mount achieve 55mm back focus?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhen combined with a Nikon Z-mount camera body (which has a 16mm flange distance), the adapter's 38.4mm optical length brings the total system distance to exactly 55mm directly from your M48-threaded corrector without requiring additional spacers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this M48 T-Mount work with my older M42 T-ring accessories?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, not directly. This adapter has M48 (female) threads, which are larger in diameter than M42 threads. While you could use a separate M42-to-M48 step-up ring, doing so may introduce vignetting (darkened corners) on full-frame cameras and would alter the precise optical length.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the William Optics M48 T-Mount prevent vignetting on my Nikon Z7?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe full-frame sensor in a Nikon Z7 requires a wide light cone from the telescope. The M48 thread standard has a larger clear aperture than the older M42 \"T-thread\" standard. This wider opening ensures the light cone isn't physically blocked before it reaches the corners of your sensor, resulting in more even illumination across the entire photograph.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs this T-Mount compatible with all William Optics telescopes?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis T-Mount is compatible with any William Optics flattener or reducer that terminates in a male M48 thread and requires a standard 55mm back focus when paired with a camera body. It delivers that 55mm optical distance directly out of the box without requiring extra spacers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the difference between this William Optics T-Mount and a generic camera adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe key difference is \u003cstrong\u003eprecision\u003c\/strong\u003e. This T-Mount is not just a physical adapter; it is an optical component engineered with a \u003cstrong\u003e38.4 mm optical length\u003c\/strong\u003e designed specifically to bring Nikon Z cameras to the standard 55mm back focus distance out of the box, ensuring sharp, coma-free stars across the entire sensor.\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\u003eInput Thread\u003c\/td\u003e\n\u003ctd\u003eM48 (female)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Mount\u003c\/td\u003e\n\u003ctd\u003eNikon Z Mirrorless\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Length\u003c\/td\u003e\n\u003ctd\u003e38.4 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\"\u003eWilliam Optics 48mm T-Mount for Nikon Z\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\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":44967966671133,"sku":"WO-TM-NK-Z-M48","price":94.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/WO-TM-NK-Z-M48-1__49413.1641314858.1280.1280.jpg?v=1684347348"},{"product_id":"william-optics-48mm-t-mount-for-canon-eos-r-mirrorless","title":"William Optics 48mm T-Mount for Canon EOS R Mirrorless","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConnects M48-threaded correctors to Canon EOS R mirrorless cameras\u003c\/li\u003e\n\u003cli\u003eWide 48mm aperture minimizes vignetting on full-frame sensors\u003c\/li\u003e\n\u003cli\u003ePrecisely machined 34.4mm optical length achieves exact 55mm back focus when combined with camera\u003c\/li\u003e\n\u003cli\u003eCNC machined 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\u003eWilliam Optics 48mm T-Mount for Canon EOS R Mirrorless\u003c\/h2\u003e\n\u003cp\u003eThe William Optics 48mm T-Mount for Canon EOS R Mirrorless provides a rigid, wide-aperture connection from your telescope's M48-threaded corrector. Consuming exactly 34.4 mm of optical path, it works seamlessly with your camera body to achieve the standard 55 mm back focus for flat-field astrophotography.\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: Full-Frame Illumination for Canon R-Series Sensors\u003c\/h3\u003e\n\u003cp\u003eThis T-Mount features a female M48x0.75 thread, which provides a significantly larger clear aperture than the older M42 T-ring standard. This wider opening is essential for illuminating the large full-frame and APS-C sensors in modern Canon R-series cameras, preventing the mechanical vignetting that can darken the corners of your images.\u003c\/p\u003e\n\u003cp\u003eBy connecting directly to the wide-format flatteners, reducers, and correctors common on high-end imaging refractors, this adapter ensures that the maximum amount of corrected light reaches your sensor. The result is a more evenly illuminated field, reducing the need for aggressive flat-frame correction in post-processing.\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 Correct Back Focus: Built for Standard 55mm Back Focus\u003c\/h3\u003e\n\u003cp\u003eEvery field flattener or reducer requires a precise distance to the camera sensor to deliver sharp, coma-free stars across the entire frame. This William Optics T-Mount is engineered with an exact optical length of 34.4 mm, which combines with the Canon RF mount's 20.6 mm flange distance to achieve the standard 55 mm total back focus directly—no additional spacers required.\u003c\/p\u003e\n\u003cp\u003eBy delivering the exact 55 mm optical path out of the box, this adapter removes the guesswork and ensures your entire imaging system is performing at its peak optical potential.\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 advantage of this William Optics M48 T-Mount over a standard M42 T-ring for my Canon EOS R?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary advantage is the larger \u003cstrong\u003eM48 (48mm)\u003c\/strong\u003e thread diameter compared to the 42mm diameter of a standard T-ring. This wider aperture prevents the adapter itself from clipping the light cone, which causes vignetting (darkened corners) on large sensors like those in Canon R-series cameras.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 34.4mm optical length of the William Optics T-Mount achieve 55mm back focus?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhen combined with the Canon EOS R camera body (which has a 20.6mm sensor flange distance), the adapter's 34.4mm optical length brings the total system distance to exactly 55mm (34.4mm + 20.6mm = 55mm) directly from your M48-threaded corrector without requiring additional spacers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs this William Optics T-Mount compatible with Canon EF or EF-S DSLR cameras?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. This T-Mount is designed specifically for the \u003cstrong\u003eCanon RF mount\u003c\/strong\u003e used on Canon EOS R-series mirrorless cameras (R, Ra, R3, R5, R6, etc.). It will not physically attach to Canon DSLRs that use the EF or EF-S mount.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the William Optics M48 T-Mount for Canon R accept 2-inch filters?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis adapter itself does not have threads to mount a filter inside it. However, its M48 female thread is designed to connect to a filter wheel, filter drawer, or corrector that accepts standard 2-inch (M48) filters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this 34.4mm T-Mount work with a Celestron EdgeHD 8\" and its 0.7x reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, but you will need additional extension. The Celestron 0.7x reducer for the EdgeHD 8\" requires 146mm of back focus. Since this adapter and your camera total 55mm, you would need an additional 91mm of M48 extension tubes between the reducer and this T-Mount to reach the required 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\u003eTelescope Side Connection\u003c\/td\u003e\n\u003ctd\u003eM48 (Female)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Side Connection\u003c\/td\u003e\n\u003ctd\u003eCanon EOS R Mount\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Length\u003c\/td\u003e\n\u003ctd\u003e34.4 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\"\u003eWilliam Optics 48mm T-Mount for Canon EOS R Mirrorless\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\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":44967981842717,"sku":"WO-TM-CN-EOSR-M48","price":94.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/WO-TM-CN-EOSR-M48__12431.1643817906.1280.1280.jpg?v=1684347518"},{"product_id":"william-optics-longer-adjusting-adapter-for-flat68iii-flat7a","title":"William Optics Longer adjusting adapter for FLAT68III, FLAT7A","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConnects FLAT68III \u0026amp; FLAT7A Flatteners to M48 Imaging Trains\u003c\/li\u003e\n\u003cli\u003eProvides a Fixed 45mm Optical Length\u003c\/li\u003e\n\u003cli\u003eInput Thread: M80 x 0.75 Male\u003c\/li\u003e\n\u003cli\u003eOutput Thread: M48 x 0.75 Male\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\u003eWilliam Optics Longer Adjusting Adapter for FLAT68III, FLAT7A\u003c\/h2\u003e\n\u003cp\u003eThe William Optics WO-AD-M80-45-M48 is a crucial component for achieving perfect back focus, providing a fixed 45mm of optical length between your flattener and camera. It connects the M80 x 0.75 female thread on a FLAT68III or FLAT7A flattener to the standard M48 x 0.75 thread common to most astronomy cameras, filter wheels, and off-axis guiders.\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 45mm Extension for FLAT68III \u0026amp; FLAT7A\u003c\/h3\u003e\n\u003cp\u003eThis adapter solves a common spacing problem for imagers using William Optics' high-end flatteners. When your camera's sensor-to-flange distance, combined with other accessories, doesn't add up to the required back focus, this 45mm adapter fills that critical gap with a single, rigid component, minimizing tilt and flexure in your imaging train.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eM80 x 0.75 Input:\u003c\/strong\u003e Threads directly and securely onto the William Optics FLAT68III and FLAT7A field flatteners.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM48 x 0.75 Output:\u003c\/strong\u003e The standard 2-inch filter thread ensures broad compatibility with the vast majority of dedicated astronomy cameras and imaging accessories.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFixed 45mm Length:\u003c\/strong\u003e Provides a non-adjustable, mechanically stable 45mm of spacing, essential for maintaining a flat field from corner to corner.\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 WO-AD-M80-45-M48 adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis adapter is designed to provide a precise \u003cstrong\u003e45mm\u003c\/strong\u003e of optical spacing. It's used to connect a William Optics \u003cstrong\u003eFLAT68III\u003c\/strong\u003e or \u003cstrong\u003eFLAT7A\u003c\/strong\u003e flattener (which has an M80 thread) to an imaging train that uses the standard M48 thread, helping you achieve the correct back focus distance required by the flattener.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I know if I need this 45mm adapter for my FLAT68III and imaging setup?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou need to calculate the total back focus of your imaging train. Start with the flattener's required back focus distance, then subtract the back focus of your camera and any accessories (filter wheel, off-axis guider). If the remaining distance you need to fill is 45mm, this adapter is the perfect single-piece solution.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eAre the threads on the WO-AD-M80-45-M48 adapter male or female?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eBoth the \u003cstrong\u003eM80 x 0.75\u003c\/strong\u003e (Light-In) and \u003cstrong\u003eM48 x 0.75\u003c\/strong\u003e (Light-Out) threads on this adapter are male. It is designed to thread into the female port on the flattener and connect to a female M48 thread on your next accessory.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the optical length of the WO-AD-M80-45-M48 adapter adjustable?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, it is not. The adapter provides a fixed, rigid optical length of \u003cstrong\u003e45mm\u003c\/strong\u003e. The term \"adjusting adapter\" in the title refers to its role in helping you *adjust* your overall back focus to the correct distance, not that the adapter itself is variable.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the WO-AD-M80-45-M48 with a flattener other than the FLAT68III or FLAT7A?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003ePhysically, it might thread on if another flattener uses an M80 x 0.75 female port. However, it is mechanically and optically designed specifically for the William Optics FLAT68III and FLAT7A to achieve their intended back focus. Using it with other flatteners is not recommended as it will likely result in incorrect spacing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy use a single 45mm adapter instead of stacking smaller spacers?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eUsing a single, solid 45mm adapter like the WO-AD-M80-45-M48 is mechanically superior to stacking multiple smaller spacers. A single component minimizes the potential for tilt, flexure, and light leaks in the imaging train, leading to sharper stars across the entire field of view.\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\u003eInput Thread (Light-In Side)\u003c\/td\u003e\n\u003ctd\u003eM80 x 0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Thread (Light-Out Side)\u003c\/td\u003e\n\u003ctd\u003eM48 x 0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Length\u003c\/td\u003e\n\u003ctd\u003e45 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\"\u003eWilliam Optics M80 to M48 Adapter (45mm)\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\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":45173712814365,"sku":"WO-AD-M80-45-M48","price":80.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/William-Optics-AD-M80-45-M48.jpg?v=1687199871"},{"product_id":"william-optics-ad-m80tom54","title":"William Optics 30mm Flattener Adapter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e30mm Optical Length\u003c\/li\u003e\n\u003cli\u003eConnects M80 x 0.75 to M54 x 0.75 Threads\u003c\/li\u003e\n\u003cli\u003eFor William Optics Flat68III \u0026amp; Flat7A Flatteners\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\u003e30mm Flattener Adapter\u003c\/h2\u003e\n\u003cp\u003eThe 30mm Flattener Adapter establishes a precise 30 mm of optical length while converting the M80 x 0.75 thread on specific William Optics flatteners to the common M54 x 0.75 thread used by modern astronomy cameras and filter wheels.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e30mm M80-to-M54 Adapter for William Optics Flatteners\u003c\/h3\u003e\n\u003cp\u003eThis adapter is purpose-built to integrate William Optics Flat68III and Flat7A flatteners into modern imaging trains. By converting the flattener's native M80 x 0.75 output thread to the widely adopted M54 x 0.75 standard, it allows direct connection to most filter wheels, off-axis guiders, and dedicated astronomy cameras.\u003c\/p\u003e\n\u003cp\u003eThe fixed 30 mm optical length is a critical component for achieving the correct back focus distance. This rigid, machined spacer removes a common variable in spacing calculations, ensuring your sensor is positioned at the precise focal plane required for sharp stars across the entire field.\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 30mm Flattener Adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis adapter serves two key functions: it converts the M80 x 0.75 thread from a compatible flattener to a more common M54 x 0.75 camera-side thread, and it adds exactly 30 mm of optical length to help 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\"\u003eWhich William Optics flatteners is this 30mm adapter designed for?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt is specifically designed for use with the \u003cstrong\u003eWilliam Optics Flat68III\u003c\/strong\u003e and \u003cstrong\u003eFlat7A\u003c\/strong\u003e flatteners, matching their M80 x 0.75 output threads.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I know if I need this 30mm adapter for my imaging train?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou need this adapter if your imaging train requires exactly 30 mm of spacing between your Flat68III or Flat7A flattener and your next M54-threaded accessory to achieve the total back focus distance. Always calculate your complete optical path length to confirm this component provides the correct spacing for your specific camera and accessories.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat are the exact thread sizes on the 30mm Flattener Adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe adapter has female \u003cstrong\u003eM80 x 0.75\u003c\/strong\u003e threads on the telescope\/flattener side and male \u003cstrong\u003eM54 x 0.75\u003c\/strong\u003e threads on the camera side.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes this 30mm adapter affect the optical correction of my flattener?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, the adapter contains no optical elements. It is a purely mechanical spacer designed to position your camera sensor at the correct distance where the flattener's optical correction is optimal. Using incorrect spacing will result in poor field correction and elongated stars.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this 30mm adapter with a filter wheel on my William Optics GT81 telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this is a common application. If you are using a William Optics GT81 with a compatible flattener like the Flat68III, this 30mm adapter connects the flattener to an M54-threaded filter wheel. You must still account for the optical thickness of the filter wheel and any other spacers to ensure you hit the total required 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\u003eTelescope Side Thread\u003c\/td\u003e\n\u003ctd\u003eM80 x 0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Side Thread\u003c\/td\u003e\n\u003ctd\u003eM54 x 0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Length\u003c\/td\u003e\n\u003ctd\u003e30 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\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":52853690827037,"sku":"WO-AD-M80TOM54","price":80.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/WilliamOptics-30mm-Flattener-Adapter-1_c0c280c0-4536-4cdb-8419-22f1368313e5.jpg?v=1788457834"},{"product_id":"william-optics-ad-m80-54-m48","title":"William Optics 54mm Flattener Extender for GT81 WIFD","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eProvides a precise 54mm of optical length\u003c\/li\u003e\n\u003cli\u003eConnects the FLAT68III flattener to M48 imaging trains\u003c\/li\u003e\n\u003cli\u003eDesigned specifically for the William Optics Gran Turismo 81 WIFD\u003c\/li\u003e\n\u003cli\u003eInput Thread: M80 x 0.75 female\u003c\/li\u003e\n\u003cli\u003eOutput Thread: M48 x 0.75 male\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\u003e54mm Flattener Extender for GT81 WIFD\u003c\/h2\u003e\n\u003cp\u003eThe William Optics 54mm Flattener Extender is a purpose-built adapter that provides exactly 54 mm of optical length for imagers using the GT81 WIFD telescope and FLAT68III flattener. This single component connects the flattener's M80 x 0.75 female thread to the standard M48 x 0.75 male thread of your camera or filter wheel, creating a rigid, tilt-free imaging train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe 54mm Spacer for FLAT68III on the GT81 WIFD\u003c\/h3\u003e\n\u003cp\u003eAchieving a perfectly flat field with the Gran Turismo 81 WIFD and FLAT68III flattener requires precise back focus. This 54mm extender is the critical component for reaching the standard 55mm back focus distance required by most astronomy cameras, with the final 1mm typically accounted for within the camera body itself. It replaces guesswork and spacer stacking with a single, correct-length solution.\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\u003eSecure M80 to M48 Threaded Connection\u003c\/h3\u003e\n\u003cp\u003eThis extender features a female M80 x 0.75 thread that securely attaches to the FLAT68III, ensuring a wide, stable connection point. The male M48 x 0.75 output thread is the universal standard for 2-inch filters and full-frame imaging accessories. By using a single, machined piece instead of multiple generic spacers, you eliminate potential sources of flexure and tilt that can degrade corner star shapes.\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 54mm Flattener Extender for my GT81 WIFD?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis 54mm extender is engineered to provide the exact spacing required between the William Optics FLAT68III flattener and your camera sensor when used with the Gran Turismo 81 WIFD telescope. This ensures you achieve the specified 55mm back focus for a flat field and sharp stars corner-to-corner.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 54mm Flattener Extender help achieve the standard 55mm back focus?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe total back focus of 55mm is a combination of this extender and the internal optical path of your camera. This adapter provides \u003cstrong\u003e54 mm\u003c\/strong\u003e of the required distance. The remaining \u003cstrong\u003e1 mm\u003c\/strong\u003e is typically the distance from the M48 thread flange on your camera to the sensor plane itself, a common specification for dedicated astronomy cameras.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the advantage of using this single 54mm Flattener Extender over stacking M48 spacers?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA single, solid extender provides a much more rigid and stable connection. Stacking multiple smaller spacers can introduce flexure or tilt into the imaging train, which can lead to elongated stars in the corners of your images. This purpose-built extender guarantees alignment and stability.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this 54mm Flattener Extender work with my full-frame camera and 2\" filter wheel on the GT81 WIFD?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The output thread is M48 x 0.75, which is the standard for connecting to most 2\" filter wheels and full-frame camera adapters. You must ensure your total back focus, including the filter wheel and any other adapters, adds up to the required 55mm from the flattener's flange.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this 54mm Flattener Extender with a different telescope, like a ZenithStar?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this extender is specifically calculated for the focal length and optical design of the William Optics GT81 WIFD when paired with the FLAT68III flattener. Using it on another telescope will likely result in incorrect spacing and poor image quality, as different telescopes require different back focus distances.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat are the thread sizes for the 54mm Flattener Extender?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe extender has two threads:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLight-In Side (attaches to flattener):\u003c\/strong\u003e M80 x 0.75 female thread\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLight-Out Side (attaches to camera):\u003c\/strong\u003e M48 x 0.75 male thread\u003c\/li\u003e\n\u003c\/ul\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\u003eOptical Length\u003c\/td\u003e\n\u003ctd\u003e54 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Thread (Flattener Side)\u003c\/td\u003e\n\u003ctd\u003eM80 x 0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Thread (Camera Side)\u003c\/td\u003e\n\u003ctd\u003eM48 x 0.75\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\"\u003e54mm Flattener Extender for GT81 WIFD\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\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":52853690859805,"sku":"WO-AD-M80-54-M48","price":94.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/WilliamOptics-54mm-Flattener-Extender-for-GT81-WIFD-1_f1df95df-d7df-4d6c-8c8d-5db8ff55af7b.jpg?v=1788457843"},{"product_id":"william-optics-ye-m92-63","title":"William Optics M92 to M63 Adapter for William Optics FLT91","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConnects William Optics FLT91 Telescope to Flat6AIII Flattener\u003c\/li\u003e\n\u003cli\u003eInput Thread: M92 Male\u003c\/li\u003e\n\u003cli\u003eOutput Thread: M63 Female\u003c\/li\u003e\n\u003cli\u003eOptical Path Length: 10.5 mm\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\u003eM92 to M63 Adapter for William Optics FLT91\u003c\/h2\u003e\n      \u003cp\u003eThis M92 to M63 adapter provides the essential 10.5 mm of optical path length required to connect a William Optics Flat6AIII flattener to an FLT91 refractor. It is a purpose-built component designed to achieve precise back focus for a flat, corrected field of view.\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\u003eA Purpose-Built Connection for the FLT91 and Flat6AIII at 10.5mm\u003c\/h3\u003e\n      \u003cp\u003eThis is not a generic thread converter; it is an essential optical component for imagers using the William Optics FLT91 telescope with the Flat6AIII flattener\/reducer. The adapter's 10.5 mm length is precisely calculated to establish the correct spacing between the telescope's optics and the flattener, which is critical for achieving sharp stars across the entire imaging sensor.\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eTelescope-Side Connection:\u003c\/strong\u003e The male M92 thread attaches directly to the focuser drawtube of the FLT91 telescope.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eFlattener-Side Connection:\u003c\/strong\u003e The female M63 thread accepts the nosepiece of the Flat6AIII flattener\/reducer.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eCritical Spacing:\u003c\/strong\u003e By consuming exactly 10.5 mm of the optical path, this adapter ensures the flattener is positioned at its design distance for optimal field correction.\u003c\/li\u003e\n      \u003c\/ul\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the primary purpose of this M92 to M63 Adapter?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThis adapter is designed specifically to connect the \u003cstrong\u003eWilliam Optics FLT91\u003c\/strong\u003e telescope to the \u003cstrong\u003eFlat6AIII\u003c\/strong\u003e flattener\/reducer. Its primary function is to provide a precise \u003cstrong\u003e10.5 mm\u003c\/strong\u003e of spacing, which is required to achieve the correct back focus for a flat imaging field.\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 with my William Optics FLT91 and Flat6AIII?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYou thread the \u003cstrong\u003eM92 male\u003c\/strong\u003e side of the adapter directly onto the focuser of your FLT91 telescope. Then, you thread the Flat6AIII flattener into the \u003cstrong\u003eM63 female\u003c\/strong\u003e side of the adapter. This configuration establishes the correct mechanical and optical connection between the two components.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is the 10.5 mm optical length of this M92 to M63 adapter important?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe \u003cstrong\u003e10.5 mm\u003c\/strong\u003e optical length is the most critical specification. Field flatteners must be placed at an exact distance from the telescope's objective to work correctly. This adapter consumes 10.5 mm of the back focus to ensure the Flat6AIII is positioned perfectly relative to the FLT91's focal plane, resulting in sharp stars from edge to edge.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIs this M92 to M63 adapter a universal part for other telescopes?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eNo, this is a specialized component. While the M92 and M63 threads may be used on other equipment, the \u003cstrong\u003e10.5 mm\u003c\/strong\u003e optical length is specifically calculated for the FLT91 and Flat6AIII combination. Using it with other equipment will likely result in incorrect spacing and poor image quality.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eDoes installing this adapter set the final back focus for my FLT91 imaging train?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eNo. This adapter correctly spaces the \u003cstrong\u003eflattener relative to the telescope\u003c\/strong\u003e. You must still add the correct spacers between the flattener and your camera sensor to meet the flattener's own back focus requirement (typically 55 mm, but always check your flattener's manual).\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat are the exact thread specifications for this adapter?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe adapter features the following threads:\u003c\/p\u003e\n    \u003cul\u003e\n      \u003cli\u003e\n\u003cstrong\u003eLight-In Side (Telescope):\u003c\/strong\u003e M92 male thread\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eLight-Out Side (Accessory):\u003c\/strong\u003e M63 female thread\u003c\/li\u003e\n    \u003c\/ul\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\u003eLight-In Side Thread\u003c\/td\u003e\n\u003ctd\u003eM92 (male)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eLight-Out Side Thread\u003c\/td\u003e\n\u003ctd\u003eM63 (female)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eOptical Length\u003c\/td\u003e\n\u003ctd\u003e10.5 mm\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\"\u003eM92 to M63 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\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":52853692006685,"sku":"WO-YE-M92-63","price":121.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/WilliamOptics-M92-M63-Adapter-1_672f1295-9774-4879-8339-50e40156acb6.jpg?v=1788457926"},{"product_id":"william-optics-p-m92ex","title":"William Optics 4\" Extender for FLT Series","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eAdds 67 mm of optical length to your imaging train\u003c\/li\u003e\n\u003cli\u003eFeatures M92 male and female threads for a secure connection\u003c\/li\u003e\n\u003cli\u003eDesigned for William Optics FLT 110 \u0026amp; FLT 132 refractors\u003c\/li\u003e\n\u003cli\u003eEnables focus with filter wheels, OAGs, and other accessories\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\u003eWilliam Optics 4\" Extender for FLT Series\u003c\/h2\u003e\n\u003cp\u003eThe William Optics 4\" Extender provides a fixed 67 mm of optical length for imaging trains on FLT series telescopes like the FLT 110 and FLT 132. It connects via male and female M92 threads, ensuring a rigid, non-flexing connection between the focuser and your camera or flattener, which is critical for achieving sharp, round stars across the field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eM92 Threads and 67mm Extension for FLT 110 \u0026amp; FLT 132\u003c\/h3\u003e\n\u003cp\u003eDesigned specifically for the William Optics FLT 110 and FLT 132 refractors, this 4\" extender adds precisely 67 mm of back focus to your imaging setup. This additional length is often essential to reach focus with complex imaging trains that include accessories like filter wheels, off-axis guiders, and rotators.\u003c\/p\u003e\n\u003cp\u003eThe robust M92 male and female threads provide a secure, direct-threaded connection to the telescope's 4\" focuser. This eliminates the potential for tilt or flex that can occur with less secure slip-fit adapters, ensuring your entire imaging system remains perfectly aligned.\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\"\u003eWill this 4\" Extender help me reach focus with a filter wheel on my William Optics FLT 132?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this is its primary purpose. The \u003cstrong\u003e67 mm of extension\u003c\/strong\u003e is designed to push the focal point outward, providing the necessary back focus to accommodate accessories like filter wheels and off-axis guiders that would otherwise prevent you from reaching focus.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat are the thread specifications for the William Optics 4\" Extender?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe extender uses \u003cstrong\u003eM92 threads\u003c\/strong\u003e. It features an M92 male thread on the light-in (telescope) side and an M92 female thread on the light-out (camera) side for a direct, secure connection.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the William Optics 4\" Extender compatible with telescopes other than the FLT 110 and FLT 132?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile it is specifically engineered for the William Optics FLT 110 and FLT 132, it may work with other telescopes that feature a 4\" focuser with a female M92 thread. You must verify your telescope's specific thread size and back focus requirements before purchasing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is it called a \"4\" Extender\" if it only provides 67 mm of extension?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \"4\"\" designation refers to the size of the focuser it is designed to mate with, such as the 4\" focusers found on the FLT 110 and FLT 132 telescopes. The actual optical length it adds to the light path is \u003cstrong\u003e67 mm\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI am trying to do prime focus imaging with a DSLR on my FLT 110 and can't reach focus. Is this extender the solution?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt depends on which way you need to move the focuser. If you cannot reach focus because the focuser is racked all the way \u003cstrong\u003eout\u003c\/strong\u003e, this 67 mm extender will provide the additional length needed to achieve a sharp image. If your focuser is racked all the way \u003cstrong\u003ein\u003c\/strong\u003e, you need less back focus, and this extender will not help.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the William Optics 4\" Extender have any optical elements?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this is a purely mechanical extender. It is a hollow tube designed only to increase the distance between the focuser and the camera. It contains no lenses and does not alter the focal length or focal ratio 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\u003eOptical Length\u003c\/td\u003e\n\u003ctd\u003e67 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTelescope Side Connection\u003c\/td\u003e\n\u003ctd\u003eM92 (male)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Side Connection\u003c\/td\u003e\n\u003ctd\u003eM92 (female)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eWilliam Optics FLT 110, FLT 132\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\"\u003e4\" Extender (M92, 67mm)\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\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":52853692039453,"sku":"WO-P-M92EX","price":94.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/WilliamOptics-4-Extender-1_f87949a8-1fb4-404a-b71a-b798be7c12da.jpg?v=1788457936"}],"url":"https:\/\/davidastro.com\/collections\/william-optics-adapters.oembed?page=2","provider":"David Astro","version":"1.0","type":"link"}