{"product_id":"baader-planetarium-m54a-change-ring-with-s54a-ring-dovetail","title":"Baader Planetarium M54a Change Ring with S54a ring dovetail","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eAdds a secure quick-release connection to any M54 thread\u003c\/li\u003e\n\u003cli\u003eM54a female-threaded ring for telescope side\u003c\/li\u003e\n\u003cli\u003eS54a male dovetail ring for camera side\u003c\/li\u003e\n\u003cli\u003eConsumes only 4mm of optical length\u003c\/li\u003e\n\u003cli\u003eAllows 360° rotation for camera framing\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\u003eM54a Change Ring with S54a ring dovetail\u003c\/h2\u003e\n\u003cp\u003eThe Baader M54a Change Ring adds a secure, rotatable quick-release connection to your M54 imaging train while consuming only 4mm of optical length. This minimal 4mm profile is critical for maintaining focus with correctors and reducers that have strict back-focus requirements, allowing you to add convenience without compromising your optical configuration.\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\u003eBaader M54 Quick-Change System: A 4mm Optical Path Adapter\u003c\/h3\u003e\n\u003cp\u003eThis two-part system is designed to replace tedious threaded connections with a fast and secure dovetail lock. It allows you to remove your entire imaging stack—camera, filter wheel, and off-axis guider—in seconds for storage or to take flat frames, then reattach it with perfect rotational alignment and no risk of flexure.\u003c\/p\u003e\n\u003cp\u003eThe key to the system is its minimal light path consumption. At just 4mm, this quick-change ring can be inserted into nearly any imaging train that uses M54 threads without preventing the system from reaching focus. This is especially vital when using accessories like coma correctors or field flatteners that demand precise sensor spacing.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eM54a Change Ring (Female):\u003c\/strong\u003e This component has female M54 threads and typically attaches to the telescope side of your setup, such as a focuser drawtube or the output of a corrector.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eS54a Dovetail Ring (Male):\u003c\/strong\u003e This ring features the male S54a dovetail and threads into the camera side of your train, for example, onto a filter wheel or directly to a camera's M54 adapter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRotational Framing:\u003c\/strong\u003e Once connected, you can slightly loosen the lock to rotate your camera to the perfect angle for framing your target, then tighten it down for a rigid, tilt-free connection.\u003c\/li\u003e\n\u003c\/ul\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 Baader M54a Change Ring?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIts primary purpose is to provide a quick-release mechanism for your M54-threaded imaging train. This lets you detach your camera and accessories without unthreading them, which saves time, preserves rotational alignment for framing, and reduces wear on threads.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow much back focus does the M54a Change Ring use?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Baader M54a Change Ring and S54a dovetail combination consumes a total of \u003cstrong\u003e4mm of optical length\u003c\/strong\u003e (back focus). This minimal profile makes it easy to integrate into setups with tight spacing requirements.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the M54a Change Ring introduce tilt into my imaging train?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The Baader S54a dovetail system is engineered to provide a precise, rigid, and zero-tilt connection when properly seated and tightened. It is a significant improvement over simpler adapters that use setscrews, which are prone to causing tilt.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the M54a Change Ring to connect my Baader MPCC III to a ZWO camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this is an ideal application. You can thread the M54a ring onto the M54 output of the MPCC III coma corrector and the S54a dovetail onto your camera's M54 adapter or filter wheel. The 4mm optical length must be factored into your total back focus calculation to ensure you maintain the required 55mm spacing for the MPCC III.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the M54a Change Ring compatible with other thread sizes like M42 or M48?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this component is exclusively for the \u003cstrong\u003eM54 thread standard\u003c\/strong\u003e and the proprietary Baader \u003cstrong\u003eS54a dovetail\u003c\/strong\u003e. To use it with other thread sizes, you would need to purchase separate Baader Wide-T or M48 adapters to step up or down to the M54 standard.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I achieve 360° rotation with the M54a Change Ring?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe system allows for full 360° rotation for framing your target. Simply loosen the clamping mechanism on the M54a ring slightly, rotate your camera to the desired orientation, and then re-tighten the clamp to lock it securely in place.\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\u003eSystem\u003c\/td\u003e\n\u003ctd\u003eBaader M54 Quick-Change System\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart 1\u003c\/td\u003e\n\u003ctd\u003eM54a Change Ring (Female M54 Thread, Female S54a Dovetail Receiver)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart 2\u003c\/td\u003e\n\u003ctd\u003eS54a Ring Dovetail (Male S54a Dovetail)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Length\u003c\/td\u003e\n\u003ctd\u003e4 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight (kg)\u003c\/td\u003e\n\u003ctd\u003e0.05\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Diameter \/ Clear Aperture (mm)\u003c\/td\u003e\n\u003ctd\u003e50 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Diameter\u003c\/td\u003e\n\u003ctd\u003e65 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType of Adapter\u003c\/td\u003e\n\u003ctd\u003eSame-Thread Adapter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Connection (lens sided)\u003c\/td\u003e\n\u003ctd\u003eM54 x 0.75\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\"\u003eM54a Change Ring\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eS54a Ring Dovetail\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\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/baader-planetarium-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eBaader Planetarium 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Baader Planetarium","offers":[{"title":"Default Title","offer_id":52913161175325,"sku":"BAA-2958765","price":95.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/BaaderPlanetarium-M54a-Change-Ring-with-S54a-ring-dovetail-1_c6dca4b2-8900-4001-9619-681821cfea20.jpg?v=1789086958","url":"https:\/\/davidastro.com\/products\/baader-planetarium-m54a-change-ring-with-s54a-ring-dovetail","provider":"David Astro","version":"1.0","type":"link"}