{"product_id":"starizona-m68-t-adapter-for-large-celestron-scts","title":"Starizona M68 T-Adapter for Large Celestron SCTs","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConnects M68 accessories to large Celestron SCTs\u003c\/li\u003e\n\u003cli\u003eFits telescopes with 3.29\" rear cell threads\u003c\/li\u003e\n\u003cli\u003eCompatible with C11, C14, and C9.25 EdgeHD models\u003c\/li\u003e\n\u003cli\u003eProvides 91mm of optical length\u003c\/li\u003e\n\u003cli\u003eAchieves 55mm backfocus on systems requiring 146mm\u003c\/li\u003e\n\u003cli\u003eFeatures a large 65mm clear aperture\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\u003eM68 T-Adapter for Large Celestron SCTs\u003c\/h2\u003e\n      \u003cp\u003eThis Starizona M68 T-Adapter connects large off-axis guiders to Celestron SCTs with 3.29\" rear cell threads, including all C11, C14, and C9.25HD models. The adapter provides a precise 91mm optical length, establishing the standard 55mm of backfocus for a camera train on optical systems that require 146mm total backfocus. A generous 65mm clear aperture, which stops down to 62mm at the end cap, prevents vignetting even with large format sensors.\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 M68 OAGs to 3.29\" Celestron Rear Cells\u003c\/h3\u003e\n      \u003cp\u003eDesigned for imagers using larger off-axis guiders (OAGs) or accessories with M68 threads, this adapter creates a rigid, wide-aperture connection to your telescope. It attaches directly to the large 3.29\" threads found on the rear cell of all Celestron C11 and C14 models, both standard and EdgeHD, as well as the C9.25 EdgeHD. This direct-threaded attachment is critical for eliminating flexure and maintaining collimation with heavy imaging trains.\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 91mm Optical Length for 55mm Backfocus Systems\u003c\/h3\u003e\n      \u003cp\u003eAchieving correct spacing is non-negotiable for sharp, coma-free images. This adapter consumes exactly 91mm of the optical path. For systems with a 146mm backfocus requirement—such as EdgeHD telescopes at f\/10, an EdgeHD with the 0.7x reducer, or an SCT with Starizona's SCT Corrector LF—this leaves the industry-standard 55mm of remaining distance for your camera and accessories. The internal 65mm clear aperture ensures the light cone from the telescope is unobstructed, preserving brightness and image quality at the sensor.\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\u003eUpgrade Path from the Starizona M42\/48\/54 Adapter\u003c\/h3\u003e\n      \u003cp\u003eThis M68 T-Adapter shares an identical body and lock ring with Starizona's M42\/48\/54 large T-adapter with filter holder. If you already own that component and are upgrading your OAG to a larger M68 model, you do not need to purchase this entire assembly. The M68 end cap is available separately, allowing for a cost-effective transition to the larger thread size while reusing your existing adapter body.\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\"\u003eWhich Celestron telescopes are compatible with the Starizona M68 T-Adapter?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe Starizona M68 T-Adapter is compatible with any Celestron telescope that features the large 3.29\" rear cell thread. This includes \u003cstrong\u003eall C11 and C14 models (both standard SCT and EdgeHD)\u003c\/strong\u003e and the \u003cstrong\u003eC9.25 EdgeHD\u003c\/strong\u003e. It is not compatible with smaller telescopes like the C8 or C9.25 standard SCT, which use a smaller 2\" rear thread.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the clear aperture of the Starizona M68 T-Adapter?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe adapter has a clear aperture of \u003cstrong\u003e65mm\u003c\/strong\u003e for most of its length to prevent vignetting. This steps down slightly to \u003cstrong\u003e62mm\u003c\/strong\u003e at the M68 end cap itself.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Starizona M68 T-Adapter help achieve the correct 55mm backfocus?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe adapter has a fixed optical length of \u003cstrong\u003e91mm\u003c\/strong\u003e. When used on a system with a total backfocus requirement of 146mm (like an EdgeHD with a reducer), it consumes 91mm of that distance. This leaves exactly \u003cstrong\u003e55mm\u003c\/strong\u003e of remaining backfocus, which is the standard spacing required for most DSLRs with a T-ring, and many dedicated astronomy cameras when paired with filter wheels or OAGs.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eI have a C8 EdgeHD. Will the Starizona M68 T-Adapter fit my telescope?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eNo. The Celestron C8 EdgeHD uses a smaller 2\" SCT thread on its rear cell. This Starizona M68 T-Adapter is designed exclusively for the larger 3.29\" threads found on the C9.25HD, C11, and C14 models.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Starizona M68 T-Adapter with my C14 EdgeHD and the 0.7x reducer?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes. The C14 EdgeHD with the 0.7x reducer has a backfocus requirement of 146mm. The 91mm optical length of the Starizona M68 T-Adapter is designed specifically for this configuration, leaving you with the standard 55mm of spacing for your camera train.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eI already own Starizona's M42\/48\/54 T-adapter. Do I need to buy this entire M68 T-Adapter?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eNo, you may not need the full assembly. The main body and lock ring of this M68 adapter are identical to the M42\/48\/54 version. Starizona offers the M68 end cap as a separate part, allowing you to upgrade your existing adapter to support M68 accessories without replacing the entire unit.\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\u003eAdapter Type\u003c\/td\u003e\n\u003ctd\u003eT-Adapter\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eAccessory Connection\u003c\/td\u003e\n\u003ctd\u003eM68 x 1 Female Threads\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eTelescope Connection\u003c\/td\u003e\n\u003ctd\u003e3.29\" Female Threads\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eTelescope Compatibility\u003c\/td\u003e\n\u003ctd\u003eCelestron C11 (SCT\/EdgeHD), C14 (SCT\/EdgeHD), C9.25 (EdgeHD)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eOptical Length\u003c\/td\u003e\n\u003ctd\u003e91mm\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eClear Aperture\u003c\/td\u003e\n\u003ctd\u003e65mm (main body), 62mm (at end cap)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eBackfocus Usage\u003c\/td\u003e\n\u003ctd\u003eConsumes 91mm, leaving 55mm on systems with 146mm total backfocus\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eRecommended Systems\u003c\/td\u003e\n\u003ctd\u003eEdgeHD at f\/10, EdgeHD with 0.7x Reducer, SCTs with Starizona SCT Corrector LF\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\"\u003eM68 T-Adapter for Large Celestron SCTs\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\/starizona-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eStarizona Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Starizona","offers":[{"title":"Default Title","offer_id":68033925644573,"sku":"STZ-TAFH-M68","price":99.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Starizona-M68-T-Adapter-for-Large-Celestron-SCTs-1_f0838939-e452-4637-9d62-515743a09e35.jpg?v=1794375617","url":"https:\/\/davidastro.com\/en-us\/products\/starizona-m68-t-adapter-for-large-celestron-scts","provider":"David Astro","version":"1.0","type":"link"}