{"title":"William Optics Visual Adapters","description":"\u003cp\u003eWilliam Optics visual adapters connect diagonals and eyepieces to refractors and SCTs. Most are RotoLock visual backs, which use a rotating clamp ring to center and hold the accessory: 1.25\" and 2\" SCT versions, a 2\" SCT 3.28\" adapter, a 2\" M63 version, a 2\"-1.25\" reducer and a 3.5\"-2\" adapter.\u003c\/p\u003e\u003cp\u003eThe collection also includes an M48 push-in nosepiece for William Optics 2\" diagonals and the UniGuide scope, and a gold SCT connection for William Optics diagonals.\u003c\/p\u003e","products":[{"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-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"}],"url":"https:\/\/davidastro.com\/collections\/william-optics-visual-adapters.oembed","provider":"David Astro","version":"1.0","type":"link"}