{"title":"William Optics RotoLock Visual Back Adapters","description":"\u003cp\u003eWilliam Optics RotoLock adapters are visual backs that hold a diagonal or eyepiece with a rotating clamp ring, which centers it and lets you turn it without loosening the connection.\u003c\/p\u003e\u003cp\u003eThe range includes 1.25\" and 2\" adapters for SCT threads, a 2\" RotoLock Adapter SCT 3.28\" for larger thread sizes, a 2\" RotoLock for M63 focusers, a 2\"-1.25\" reducer and a 3.5\"-2\" adapter for large focusers. They suit refractor and SCT owners who want a secure, centered visual back.\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-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"}],"url":"https:\/\/davidastro.com\/collections\/william-optics-rotolock-visual-back-adapters.oembed","provider":"David Astro","version":"1.0","type":"link"}