{"product_id":"shelyak-ba0027","title":"Shelyak T-mount adapter ring for SCT","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConnects Shelyak spectrographs to Schmidt-Cassegrain telescopes\u003c\/li\u003e\n\u003cli\u003eMale M42x0.75 T-mount thread for instrument connection\u003c\/li\u003e\n\u003cli\u003eFemale 2-inch thread for SCT rear-cell attachment\u003c\/li\u003e\n\u003cli\u003eFully compatible with standard 0.63x focal reducers\u003c\/li\u003e\n\u003cli\u003eProvides a rigid, tilt-free threaded 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\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\u003eT-mount adapter ring for SCT\u003c\/h2\u003e\n      \u003cp\u003eThis T-mount adapter ring for SCT provides a direct M42x0.75 T-thread connection for your spectrograph, attaching securely to the 2-inch rear cell thread of standard Meade and Celestron telescopes. This essential component is engineered to create a rigid optical train and is fully compatible with common 0.63x focal reducers, allowing you to optimize your SCT's focal ratio for spectroscopy.\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 M42x0.75 Connection for Shelyak Spectrographs\u003c\/h3\u003e\n      \u003cp\u003eDesigned for scientific instrumentation, this adapter creates a solid, threaded link between your telescope and spectrograph. It is the ideal solution for attaching Shelyak instruments like the Alpy 600, LISA, or UVEX to any Schmidt-Cassegrain telescope or accessory with a standard 2-inch male thread.\u003c\/p\u003e\n      \u003cp\u003eThe male M42x0.75 T-threads ensure a non-flexing, perfectly aligned connection to your instrument. Compared to a simple slip-fit nosepiece, this threaded adapter eliminates the possibility of tilt or sag, which is critical for maintaining precise focus and calibration during long spectroscopic exposures.\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\u003eFull Compatibility with 0.63x SCT Focal Reducers\u003c\/h3\u003e\n      \u003cp\u003eThis adapter is specifically designed to work seamlessly with the classic 0.63x focal reducers used on most SCTs. By placing the reducer between the telescope and this adapter, you can shorten your instrument's effective focal length and increase its light-gathering speed.\u003c\/p\u003e\n      \u003cp\u003eAchieving a faster focal ratio is highly advantageous for spectroscopy, as it concentrates more light onto the spectrograph's slit, increasing signal-to-noise ratio and reducing required exposure times for faint targets. This adapter ensures you can integrate a reducer into your imaging train without compatibility issues.\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 this SCT T-mount adapter ring?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThis adapter's primary function is to connect an instrument with a female T-thread (M42x0.75), such as a Shelyak spectrograph or a DSLR camera with a T-ring, directly to the rear cell of a Schmidt-Cassegrain telescope (SCT) that uses a standard 2-inch thread.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhich specific Shelyak instruments is this SCT T-mount adapter designed for?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThis adapter is confirmed to be compatible with a range of Shelyak instruments, including the \u003cstrong\u003eeShel FIGU\u003c\/strong\u003e, \u003cstrong\u003eAlpy 600\u003c\/strong\u003e, \u003cstrong\u003eLISA\u003c\/strong\u003e, and \u003cstrong\u003eUVEX\u003c\/strong\u003e spectrographs, allowing them to be securely mounted on Meade or Celestron SCTs.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWill this adapter work with my Celestron EdgeHD 8\" telescope?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes. The Celestron EdgeHD 8\" uses the standard 2-inch SCT thread on its rear cell, making it fully compatible with this adapter. You can thread the adapter directly onto the telescope's visual back or onto a compatible focal reducer.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this SCT T-mount adapter with a 0.63x focal reducer on my Meade LX200?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eAbsolutely. This adapter is specifically designed for this scenario. You would first thread your 0.63x reducer onto the rear cell of your Meade LX200, and then thread this adapter onto the male threads of the focal reducer.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat are the thread sizes on this SCT T-mount adapter ring?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe adapter features two standard threads:\u003c\/p\u003e\n    \u003cul\u003e\n      \u003cli\u003e\n\u003cstrong\u003eTelescope Side:\u003c\/strong\u003e A female 2-inch (50.8mm) thread to attach to an SCT.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eInstrument Side:\u003c\/strong\u003e A male M42x0.75 T-mount thread to attach to a camera or spectrograph.\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhy should I use this threaded SCT T-mount adapter instead of a 2\" nosepiece for my spectrograph?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eA threaded connection is significantly more secure and rigid than a slip-fit nosepiece held by set screws. For sensitive applications like spectroscopy, this adapter prevents instrument tilt and flexure, ensuring that your calibration and focus remain stable throughout an imaging session.\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\u003eInstrument Connection\u003c\/td\u003e\n\u003ctd\u003eMale T-Thread (M42x0.75)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eTelescope Connection\u003c\/td\u003e\n\u003ctd\u003eFemale 2-inch SCT Thread\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eShelyak eShel FIGU, Alpy 600, LISA, UVEX; 0.63x Focal Reducers\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\"\u003eT-mount adapter ring 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\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/shelyak-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eShelyak 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Shelyak","offers":[{"title":"Default Title","offer_id":52943026782493,"sku":"SHK-BA0027","price":91.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Shelyak-T-mount-adapter-ring-for-SCT-1_146119ff-7909-4e18-be3f-f81f410526d6.jpg?v=1789615802","url":"https:\/\/davidastro.com\/fr-us\/products\/shelyak-ba0027","provider":"David Astro","version":"1.0","type":"link"}