{"product_id":"baader-planetarium-adapter-4-1-inch-i-to-m68i-for-tec-140-200-and-3-5-inch-feathertouch-focuser","title":"Baader Planetarium Adapter 4.1\"i to M68i – for TEC 140-200 and 3.5\" Feathertouch focuser","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConnects 4.1\" TEC and 3.5\" Feathertouch focusers to the Baader M68 system\u003c\/li\u003e\n\u003cli\u003eCreates a rigid, all-threaded connection for maximum stability\u003c\/li\u003e\n\u003cli\u003eEngineered to eliminate sag and flexure with heavy imaging equipment\u003c\/li\u003e\n\u003cli\u003eProvides the essential starting point for building an M68 optical train\u003c\/li\u003e\n\u003cli\u003eIdeal for professional-level astrophotography and spectroscopy\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\u003eAdapter 4.1\"i to M68i – for TEC 140-200 and 3.5\" Feathertouch focuser\u003c\/h2\u003e\n\u003cp\u003eThe Baader Adapter 4.1\"i to M68i creates a zero-flexure, all-threaded connection from the large-format drawtubes of TEC 140-200 and 3.5\" Feathertouch focusers directly to the Baader M68 system, securing heavy imaging trains for professional-level photography and spectroscopy.\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\u003eFrom 4.1\" to M68i: A Zero-Flexure Connection for Heavy Imaging Trains\u003c\/h3\u003e\n\u003cp\u003eFor advanced imaging or spectroscopy, any amount of mechanical flexure in the optical train can render data unusable. Standard 2\" compression clamps, even high-quality ones, can allow heavy or long accessories like telecentric systems or large cameras to tilt, destroying orthogonality. This adapter replaces that potential point of failure with a robust, large-diameter M68 threaded connection.\u003c\/p\u003e\n\u003cp\u003eBy screwing directly onto the focuser's drawtube, this adapter ensures your entire imaging train—from the focuser to the camera sensor—is held in perfect alignment. This rigid foundation is the key to achieving sharp, consistent results, especially during long exposures or when using complex optical accessories.\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\u003eNative Fit for TEC 140-200 and 3.5\" Feathertouch Focusers\u003c\/h3\u003e\n\u003cp\u003eThis adapter is precisely machined to integrate seamlessly with the 4.1\" female thread found on TEC 140, 160, 180, and 200 telescopes, as well as the 3.5\" Feathertouch series of focusers. It acts as the gateway to the entire Baader M68 system, a comprehensive ecosystem of extension tubes, adapters, and optical components like the M68 Tele-Compendium.\u003c\/p\u003e\n\u003cp\u003eIf you own one of these premium instruments and intend to pursue serious imaging, this adapter is not an optional accessory but a fundamental component. It is the first and most critical link in building a professional-grade optical train that maintains collimation and alignment under load.\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 purpose of the Baader 4.1\" to M68i adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIts primary purpose is to replace a standard slip-fit or compression-style connection with a rigid, secure \u003cstrong\u003eM68 threaded connection\u003c\/strong\u003e. This eliminates mechanical flexure, which is critical for astrophotography and spectroscopy with heavy equipment on TEC 140-200 and 3.5\" Feathertouch focusers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is a threaded connection better than my focuser's 2\" clamp for my camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA 2\" clamp, even a good one, relies on friction and can allow a heavy camera or a long accessory (like a Barlow or telecentric system) to sag or tilt slightly due to leverage. A direct threaded connection like the one this \u003cstrong\u003eBaader M68i adapter\u003c\/strong\u003e provides creates a solid, metal-on-metal coupling that physically cannot tilt, ensuring perfect alignment with the optical axis.\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 TEC 140 telescope for imaging planets with a telecentric system?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, absolutely. This is an ideal use case. A telecentric system can be long and heavy, making it prone to flexure in a standard clamp. This adapter provides the rigid M68 starting point you need to securely attach a telecentric system or other planetary imaging accessories for stable, high-resolution work.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI have a 3.5\" Feathertouch focuser. Can I use this adapter to attach Baader's M68 Tele-Compendium?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. This adapter is specifically designed to thread onto the 3.5\" Feathertouch focuser, providing the male M68 thread required to begin building a system with the \u003cstrong\u003eBaader M68 Tele-Compendium\u003c\/strong\u003e. It is the correct first piece for that integration.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat problem does this Baader M68i adapter solve for spectroscopy?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eSpectrographs are highly sensitive to any shift in the light path. Even microscopic flexure can cause the target star to drift off the spectrograph's slit, ruining the data. This adapter provides the exceptionally stable mechanical connection required to keep the entire optical train fixed throughout a long data acquisition session.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs this adapter all I need to connect my camera to my TEC 140?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. This adapter is the foundational piece that connects your focuser to the \u003cstrong\u003eBaader M68 system\u003c\/strong\u003e. You will need additional M68 extension tubes and adapters to achieve the correct spacing and final connection for your specific camera model.\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\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.16\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Brands\u003c\/td\u003e\n\u003ctd\u003eBaader Planetarium, Feathertouch, TEC, Zeiss\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Diameter \/ Clear Aperture (mm)\u003c\/td\u003e\n\u003ctd\u003e67\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Diameter\u003c\/td\u003e\n\u003ctd\u003e112\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\u003e10\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\u003e4.1\" Thread (104.1 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\u003c\/ul\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":52913173168413,"sku":"BAA-2458191","price":225.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/BaaderPlanetarium-Adapter-4-1-i-to-M68i-for-TEC-140-200-and-3-5-Feathertouch-focuser-1_1c5168d0-2c43-4dc1-b511-0567bec8a380.jpg?v=1789087147","url":"https:\/\/davidastro.com\/fr\/products\/baader-planetarium-adapter-4-1-inch-i-to-m68i-for-tec-140-200-and-3-5-inch-feathertouch-focuser","provider":"David Astro","version":"1.0","type":"link"}