{"product_id":"baader-planetarium-adapter-m68a-to-m48a","title":"Baader Planetarium Adapter M68a to M48a","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConverts M68 Internal Threads to M48 External Threads\u003c\/li\u003e\n\u003cli\u003eProvides a Standard Male M68 to Male M48 Connection\u003c\/li\u003e\n\u003cli\u003eEnables Attaching 2-inch (M48) Accessories to M68 Focusers\u003c\/li\u003e\n\u003cli\u003eMachined for a Secure, Low-Profile Fit in an Imaging Train\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 M68a to M48a\u003c\/h2\u003e\n\u003cp\u003eThis adapter provides a critical connection between M68 and M48 threaded accessories, allowing you to integrate the widely used M48 (2-inch filter thread) standard into a larger M68 optical train. It enables you to attach components such as cameras, filter wheels, or field flatteners with M48 female threads directly to focusers or correctors that feature a female M68 thread.\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\u003eBridge Your M68 Focuser to the M48 System\u003c\/h3\u003e\n\u003cp\u003eMany high-end focusers and correctors utilize the M68 thread for its large clear aperture and rigidity. However, the vast majority of imaging accessories are based on the smaller M48 standard. This reducer adapter solves that incompatibility by presenting a male M68 thread on one side and a male M48 thread on the other.\u003c\/p\u003e\n\u003cp\u003eThis configuration creates a secure, direct-threaded connection that is essential for minimizing tilt and flexure in a demanding astrophotography setup. By stepping down the thread size, it unlocks compatibility with a vast ecosystem of M48 accessories without compromising the stability of your imaging train.\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 use for the Adapter M68a to M48a?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIts primary function is to connect an accessory with a female \u003cstrong\u003eM48 thread\u003c\/strong\u003e (like a camera T-ring, filter drawer, or flattener) to a component with a female \u003cstrong\u003eM68 thread\u003c\/strong\u003e (typically a heavy-duty focuser or corrector). It acts as a thread reducer, making two otherwise incompatible parts work together.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I connect my 2-inch filter wheel to a Baader SteelTrack focuser with this M68 to M48 adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou would thread the \u003cstrong\u003emale M68 side\u003c\/strong\u003e of this adapter into the female M68 port on the drawtube of the Baader SteelTrack focuser. This leaves the \u003cstrong\u003emale M48 thread\u003c\/strong\u003e exposed, which you can then screw directly into the female M48 thread on the telescope side of your filter wheel.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs this M68 to M48 adapter a 'male-to-male' or 'male-to-female' adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis is a \u003cstrong\u003emale-to-male adapter\u003c\/strong\u003e. It has external threads on both sides: one M68 male thread and one M48 male thread. This is necessary to connect two components that both have female threads.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this M68a to M48a adapter add significant length to my imaging train?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile any adapter adds some optical path length, this type of reducer is typically designed to be as low-profile as possible. However, as the exact optical length is not specified, you must always measure and account for its contribution to your back focus distance to ensure your flattener or reducer performs correctly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this adapter to attach a DSLR with an M48 T-ring to my M68 threaded corrector?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, absolutely. This is a perfect use case. The M68 side of the adapter threads into your corrector, and the M48 side threads into the M48 T-ring attached to your DSLR camera body. This creates a solid, all-threaded connection from your corrector to your camera sensor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the difference between an M68 thread and an M48 thread?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eBoth are common standards in astrophotography, but they differ in size and application:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eM68 Thread:\u003c\/strong\u003e A larger format (68mm diameter) often found on high-end focusers and correctors from brands like Baader Planetarium and Takahashi. It provides a wider, more rigid connection to prevent vignetting with full-frame sensors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM48 Thread:\u003c\/strong\u003e Often called the \"2-inch filter thread\" (48mm diameter), this is the most common standard for connecting flatteners, reducers, off-axis guiders, and camera adapters.\u003c\/li\u003e\n\u003c\/ul\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\u003e0.04\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Brands\u003c\/td\u003e\n\u003ctd\u003eAstro T-2, Baader Planetarium, Zeiss\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Diameter \/ Clear Aperture (mm)\u003c\/td\u003e\n\u003ctd\u003e45\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Diameter\u003c\/td\u003e\n\u003ctd\u003e76\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\u003e5 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Connection (eyepiece\/-camera-sided)\u003c\/td\u003e\n\u003ctd\u003eM48\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Connection (lens sided)\u003c\/td\u003e\n\u003ctd\u003eM68 x 1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAdapters Family\u003c\/td\u003e\n\u003ctd\u003eM48 System, M68 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\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":52913174511901,"sku":"BAA-2458229","price":75.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/BaaderPlanetarium-Adapter-M68a-to-M48a-1_59c0c0e6-7a8e-4138-8fa9-f038ae4d138a.jpg?v=1789087188","url":"https:\/\/davidastro.com\/products\/baader-planetarium-adapter-m68a-to-m48a","provider":"David Astro","version":"1.0","type":"link"}