{"product_id":"baader-planetarium-ufc-telescope-adapter-s70a-to-m54i-optical-height-1-5-mm","title":"Baader Planetarium UFC Telescope-Adapter S70a to M54i – Optical height: 1.5 mm","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eAdapts Baader S70 Dovetail to M54 Female Thread\u003c\/li\u003e\n\u003cli\u003eOptical Height: 1.5 mm\u003c\/li\u003e\n\u003cli\u003eConnection Type: Telescope-Side Adapter\u003c\/li\u003e\n\u003cli\u003ePart of the Baader Universal Filter Changer (UFC) System\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\u003eUFC Telescope-Adapter S70a to M54i – Optical height: 1.5 mm\u003c\/h2\u003e\n\u003cp\u003eThe Baader UFC Telescope-Adapter S70a to M54i creates a rigid, ultra-low-profile connection with just 1.5 mm of optical height, preserving critical back focus in complex imaging trains. This adapter connects the telescope-facing S70 female dovetail of the Baader UFC Base to focusers, flatteners, or reducers that terminate in an M54 female (M54x0.75) 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\u003eBaader UFC System: The 1.5mm S70 to M54i Telescope-Side Adapter\u003c\/h3\u003e\n\u003cp\u003eIntegrating a filter changer into an optical path requires precise spacing, and this adapter is engineered to consume the absolute minimum. Its 1.5 mm optical height is essential for imagers using correctors or reducers with strict back focus tolerances. The adapter features the male S70 dovetail (\"S70a\") required to mate with the UFC base and a male M54 thread (\"M54i\") that securely screws into your telescope's M54 female port. This purpose-built component ensures a non-flexing link between your telescope and the UFC system, maintaining perfect optical alignment.\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 Baader UFC S70a to M54i adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis adapter is designed specifically to connect the \u003cstrong\u003etelescope side\u003c\/strong\u003e of the Baader Universal Filter Changer (UFC) Base to a focuser, flattener, or other accessory that has an M54 female thread. Its main purpose is to establish this connection while adding only \u003cstrong\u003e1.5 mm\u003c\/strong\u003e to the optical path.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is the 1.5 mm optical height of this UFC adapter important?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eMany modern optical systems, especially those with focal reducers or field flatteners, have very strict back focus requirements (typically 55 mm). The ultra-thin \u003cstrong\u003e1.5 mm profile\u003c\/strong\u003e of this adapter uses up a minimal amount of that precious distance, leaving more room for other essential components like off-axis guiders or rotators.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I attach this UFC S70a to M54i adapter to my filter changer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis is a telescope-side adapter. You first screw the M54 male thread into your focuser or corrector. Then, you align the S70 male dovetail on the adapter with the S70 female dovetail on the UFC Base and secure it using the base's locking screws.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this UFC adapter fit my Sky-Watcher Esprit 100ED focuser?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, many Sky-Watcher focusers, including those on the Esprit series, use an M54 female thread on their drawtube or included adapters. This UFC adapter is an excellent choice for integrating the Baader UFC system with those telescopes while maintaining a minimal profile.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this Baader S70 to M54i adapter on the camera side of the UFC base?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. This adapter is specifically designed for the \u003cstrong\u003etelescope side\u003c\/strong\u003e of the UFC Base (which has an S70 female dovetail). The camera side of the UFC Base has an S70 male dovetail and requires a corresponding camera-side adapter with a female S70 dovetail receiver.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI have an M54 male thread on my flattener. Is this the correct UFC adapter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. This adapter has an M54 male thread, designed to screw into a female port (\"M54i\" where 'i' stands for internal\/female). If your flattener has an M54 male thread, you would need a different UFC adapter that has an M54 female thread to receive it.\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\u003e0.02\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner Diameter \/ Clear Aperture (mm)\u003c\/td\u003e\n\u003ctd\u003e51 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Diameter\u003c\/td\u003e\n\u003ctd\u003e72 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType of Adapter\u003c\/td\u003e\n\u003ctd\u003eExpanding Adapter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical length (mm)\u003c\/td\u003e\n\u003ctd\u003e1.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Connection (eyepiece\/-camera-sided)\u003c\/td\u003e\n\u003ctd\u003eS70\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInner 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\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":52913143152925,"sku":"BAA-2459171","price":40.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/BaaderPlanetarium-UFC-Telescope-Adapter-S70a-to-M54i-Optical-height-1-5-mm-1_f63ef313-14d3-45b5-a25c-0f24ca287ce7.jpg?v=1789086727","url":"https:\/\/davidastro.com\/products\/baader-planetarium-ufc-telescope-adapter-s70a-to-m54i-optical-height-1-5-mm","provider":"David Astro","version":"1.0","type":"link"}