{"product_id":"baader-planetarium-m54-extension-tube-10-mm","title":"Baader Planetarium M54 Extension Tube – 10 mm","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eAdds a fixed 10 mm of optical path length\u003c\/li\u003e\n\u003cli\u003eM54 female (M54x0.75) and male (M54x0.75) threads\u003c\/li\u003e\n\u003cli\u003ePrevents vignetting with larger imaging sensors\u003c\/li\u003e\n\u003cli\u003eMachined for rigidity and precise spacing\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\u003eM54 Extension Tube – 10 mm\u003c\/h2\u003e\n\u003cp\u003eThe M54 Extension Tube adds a fixed 10 mm of length to your imaging train, providing the critical spacing needed to achieve perfect back focus with M54-threaded flatteners and reducers. This single, rigid 10 mm component ensures your sensor is positioned at the precise focal plane without introducing tilt or flexure.\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\u003eAchieve Critical Back Focus with 10 mm of Extension\u003c\/h3\u003e\n\u003cp\u003eBack focus is not a recommendation; it's a requirement. If your corrector specifies 55 mm of back focus and your camera, filter wheel, and off-axis guider only add up to 45 mm, you need to fill that 10 mm gap. This extension tube provides that exact 10 mm distance in a single, solid component, ensuring stars remain sharp from edge to edge.\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 Connections for M54 Full-Frame Imaging Gear\u003c\/h3\u003e\n\u003cp\u003eThe M54 thread standard is essential for modern astrophotography, offering a wider clear aperture than older T2\/M42 threads. This larger diameter is critical for preventing vignetting on full-frame and large APS-C sensors. This 10 mm extension maintains that wide M54 light path, ensuring your flat frames are clean and the corners of your images are fully illuminated.\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 M54 10 mm Extension Tube?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary use is to add exactly \u003cstrong\u003e10 mm of spacing\u003c\/strong\u003e in an astronomical imaging train. This is most often required to achieve the precise back focus distance specified by a field flattener, reducer, or coma corrector, ensuring a flat field of sharp stars across the entire sensor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eMy flattener requires 55 mm of back focus, but my camera and OAG only use 45 mm. Is the M54 10 mm Extension Tube the right part?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this is the perfect component for that scenario. The M54 10 mm Extension Tube is designed to fill that exact 10 mm gap (55 mm - 45 mm = 10 mm), placing your camera sensor at the correct distance for optimal optical correction.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this M54 extension tube cause vignetting with my full-frame camera on a large refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, the M54 extension tube is specifically designed to prevent vignetting with larger sensors. Its M54 diameter provides a much larger clear aperture than M48 or M42 (T2) threads, making it the ideal choice for full-frame (36x24mm) and large APS-C sensors, ensuring the light cone from the telescope fully illuminates the sensor corners.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the M54 10 mm Extension Tube have both male and female threads?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. To function as an extension, it has female threads on one side to connect to a component (like a flattener or filter wheel) and male threads on the other to connect to the next item in your imaging train (like an off-axis guider or camera).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy choose a fixed 10 mm M54 tube over a variable extension?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA fixed extension tube like this 10 mm version offers superior rigidity. Variable extensions, while flexible, can sometimes introduce a small amount of tilt or flexure into the imaging train. When you know you need exactly 10 mm, a solid, fixed-length tube is the most stable and reliable solution.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I stack this 10 mm tube with other M54 extensions?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, you can stack multiple M54 extension tubes to achieve a specific back focus distance. For example, if you need 15 mm of spacing, you could stack this 10 mm tube with a 5 mm tube. However, for maximum stability, it is always best to use a single extension tube of the correct length whenever possible.\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\u003e0.01 (5 mm, 7.5 mm, 10 mm)\u003cbr\u003e0.02 (15 mm)\u003cbr\u003e0.04 (30 mm)\u003cbr\u003e0.05 (40 mm)\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\u003e59 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType of Adapter\u003c\/td\u003e\n\u003ctd\u003eExtension\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical length (mm)\u003c\/td\u003e\n\u003ctd\u003e5 (5 mm)\u003cbr\u003e7.5 (7.5 mm)\u003cbr\u003e10 (10 mm)\u003cbr\u003e15 (15 mm)\u003cbr\u003e30 (30 mm)\u003cbr\u003e40 (40 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOuter Connection (eyepiece\/-camera-sided)\u003c\/td\u003e\n\u003ctd\u003eM54 x 0.75\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\u003ctr\u003e\n\u003ctd\u003eAdapters Family\u003c\/td\u003e\n\u003ctd\u003eM54 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\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Baader Planetarium","offers":[{"title":"Default Title","offer_id":52913166516509,"sku":"BAA-2958710","price":52.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/BaaderPlanetarium-M54-Extension-Tube-10-mm-1_65fce508-cb12-4276-adf9-a859241f890e.jpg?v=1789086996","url":"https:\/\/davidastro.com\/en-us\/products\/baader-planetarium-m54-extension-tube-10-mm","provider":"David Astro","version":"1.0","type":"link"}