{"product_id":"baader-planetarium-adapter-3-3-inch-i-to-m68i-for-celestron-astro-physics","title":"Baader Planetarium Adapter 3.3\"i to M68i – for Celestron \/ Astro Physics","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConnects 3.3\" telescope threads to the M68i accessory system\u003c\/li\u003e\n\u003cli\u003eDesigned for Celestron EdgeHD 9.25\", 11\", and 14\" models\u003c\/li\u003e\n\u003cli\u003eCompatible with Celestron SC 11\" and 14\" telescopes\u003c\/li\u003e\n\u003cli\u003eProvides a rigid, threaded connection for heavy imaging trains\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\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\u003eAdapter 3.3\"i to M68i – for Celestron \/ Astro Physics\u003c\/h2\u003e\n\u003cp\u003eThis Baader Planetarium adapter directly converts the large 3.3\" rear cell thread on Celestron EdgeHD 9.25\", 11\", and 14\" telescopes to the versatile Baader M68i system. It also establishes a secure M68i connection for standard Schmidt-Cassegrain 11\" and 14\" models, as well as select Astro-Physics refractors that utilize the 3.3\" thread standard.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSecure M68 System Integration for Celestron\/A-P 3.3\" Threads\u003c\/h3\u003e\n\u003cp\u003eFor imagers using large-format sensors, the native 3.3\" thread on Celestron's larger SCTs offers the widest possible clear aperture. This adapter allows you to leverage that full aperture by connecting directly to the Baader M68 system, which is designed to provide an unvignetted, flexure-free optical path for heavy components like off-axis guiders, filter wheels, and large cameras. By replacing a standard 2\" visual back, you create a fully threaded, rigid imaging train from the telescope's rear cell outwards, eliminating a common source of tilt and instability.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the primary purpose of the Adapter 3.3\"i to M68i?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis adapter's sole function is to create a robust, large-diameter threaded connection between a telescope with a \u003cstrong\u003e3.3\" rear thread\u003c\/strong\u003e (like large Celestron SCTs) and the \u003cstrong\u003eBaader M68i system\u003c\/strong\u003e of accessories. This is essential for building a stable imaging train that avoids the vignetting and flexure possible with smaller 2\" connections.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this adapter work on my Celestron EdgeHD 8\" telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The Celestron EdgeHD 8\" uses a smaller 2\" SCT thread on its rear cell. This adapter is specifically designed for the larger 3.3\" thread found on the \u003cstrong\u003eEdgeHD 9.25\", 11\", and 14\" models\u003c\/strong\u003e, as well as the standard \u003cstrong\u003eSC 11\" and 14\"\u003c\/strong\u003e telescopes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI have a Celestron 11\" SCT and want to use a Baader M68 Off-Axis Guider. Is this the part I need?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this is the correct starting point. The Adapter 3.3\"i to M68i attaches directly to your telescope's 3.3\" rear cell thread, providing the necessary female M68i thread to begin building your M68 imaging train with components like the Baader M68 Off-Axis Guider.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs this adapter the same as a standard 2\" visual back?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, it is a significant upgrade. A standard visual back typically uses thumbscrews to hold 2\" accessories, which can introduce tilt. This adapter provides a much larger clear aperture and a fully threaded M68 connection, ensuring perfect alignment and rigidity for heavy, demanding imaging setups.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhich Astro-Physics telescopes are compatible with this adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis adapter is specified for Astro-Physics telescopes that feature a \u003cstrong\u003e3.3\" rear thread\u003c\/strong\u003e. You must confirm the thread specification on your specific Astro-Physics focuser or telescope model before purchasing to ensure compatibility.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the 3.3\"i to M68i adapter add significant back focus length?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eLike any mechanical component, this adapter has a physical thickness that contributes to the total optical path length. It is designed to integrate seamlessly within the Baader M68 system, but you must account for its path length when calculating your final back focus spacing for correctors or reducers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eTelescope Side Connection\u003c\/td\u003e\n\u003ctd\u003e3.3\" Female Thread\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAccessory Side Connection\u003c\/td\u003e\n\u003ctd\u003eM68i Female Thread\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCelestron Compatibility\u003c\/td\u003e\n\u003ctd\u003eEdgeHD 9.25\", 11\", 14\" and SC 11\", 14\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAstro-Physics Compatibility\u003c\/td\u003e\n\u003ctd\u003eModels with 3.3\" rear thread\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.14\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Brands\u003c\/td\u003e\n\u003ctd\u003eAstro Physics, Baader Planetarium, Celestron, Zeiss\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Diameter \/ Clear Aperture (mm)\u003c\/td\u003e\n\u003ctd\u003e67 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Diameter\u003c\/td\u003e\n\u003ctd\u003e100 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType of Adapter\u003c\/td\u003e\n\u003ctd\u003eReducing Adapter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical length (mm)\u003c\/td\u003e\n\u003ctd\u003e7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Connection (eyepiece\/-camera-sided)\u003c\/td\u003e\n\u003ctd\u003eM68 x 1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Connection (lens sided)\u003c\/td\u003e\n\u003ctd\u003e3.3\"\/SCT Thread (84.2 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAdapters Family\u003c\/td\u003e\n\u003ctd\u003eM68 System\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\"\u003eAdapter 3.3\"i to M68i\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\u003cp\u003eNo manual or software is available for this product.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/baader-planetarium-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eBaader Planetarium Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Baader Planetarium","offers":[{"title":"Default Title","offer_id":52913172742429,"sku":"BAA-2458217","price":194.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/BaaderPlanetarium-Adapter-3-3-i-to-M68i-for-Celestron-Astro-Physics-1_1282833c-7595-400d-a0be-1e035ebf5f5b.jpg?v=1789087137","url":"https:\/\/davidastro.com\/products\/baader-planetarium-adapter-3-3-inch-i-to-m68i-for-celestron-astro-physics","provider":"David Astro","version":"1.0","type":"link"}