{"product_id":"baader-planetarium-m54-extension-tube-30-mm","title":"Baader Planetarium M54 Extension Tube – 30 mm","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eAdds 30 mm of Fixed Extension\u003c\/li\u003e\n\u003cli\u003eM54 Female and Male Threads\u003c\/li\u003e\n\u003cli\u003eEssential for Correcting Back Focus\u003c\/li\u003e\n\u003cli\u003eMatte Black Interior Minimizes Reflections\u003c\/li\u003e\n\u003cli\u003eRigid, Single-Piece Construction\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\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 – 30 mm\u003c\/h2\u003e\n      \u003cp\u003eThe M54 Extension Tube adds a precise 30 mm of fixed spacing to any optical train using the M54 thread standard, making it a critical component for achieving the exact back focus distance required by field flatteners, focal reducers, and other optical correctors.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003ePrecision 30mm Spacing for M54 Threaded Accessories\u003c\/h3\u003e\n      \u003cp\u003eMost optical correctors require a specific distance to the camera sensor to deliver sharp, coma-free stars. This M54 extension tube provides a solid 30 mm of that required distance, creating a rigid and secure connection that is superior to stacking multiple shorter adapters, which can introduce tilt or flexure.\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eAchieve Correct Spacing:\u003c\/strong\u003e Use this 30 mm tube as a primary component in your back focus calculation, combining it with other spacers to hit the exact distance specified by your flattener or reducer.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eRigid Connection:\u003c\/strong\u003e A single, machined tube ensures a flex-free connection between your camera and corrector, which is critical for maintaining optical alignment throughout an imaging session.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eInternal Baffling:\u003c\/strong\u003e The interior is painted matte black and micro-baffled to absorb stray light, preventing reflections from reducing contrast in your final image.\u003c\/li\u003e\n      \u003c\/ul\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I use the 30 mm M54 Extension Tube to achieve correct back focus?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYou use the \u003cstrong\u003eM54 Extension Tube – 30 mm\u003c\/strong\u003e as part of a complete set of spacers. For example, if your flattener requires 55 mm of back focus, you would place this 30 mm tube in the imaging train and then add other smaller spacers (like 20 mm and 5 mm) to achieve the total required distance to your camera's sensor.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIs this 30 mm M54 Extension Tube compatible with ZWO cameras and filter wheels?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes. Many ZWO cameras, filter wheels, and off-axis guiders use the M54 thread standard. This \u003cstrong\u003e30 mm M54 Extension Tube\u003c\/strong\u003e is designed to integrate seamlessly with those components, allowing you to build a rigid imaging train with the correct spacing.\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 a full-frame sensor?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe M54 thread size provides a large clear aperture that is generally sufficient to illuminate full-frame sensors (24x36 mm) without vignetting, especially in optical systems of f\/4 or slower. It is a standard choice for full-frame imaging setups for this reason.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat are the threads on this 30 mm M54 Extension Tube?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThis tube features male M54 threads on one side and female M54 threads on the other. It is designed to fit between other standard M54 astronomical accessories.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I stack this 30 mm M54 Extension Tube with other extenders?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, you can thread multiple M54 extension tubes together to achieve a longer distance. However, for maximum rigidity and to minimize the risk of tilt, it is always best to use a single extension tube that is as close to your required length as possible.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhy use a fixed 30 mm M54 tube instead of 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 \u003cstrong\u003e30 mm M54 tube\u003c\/strong\u003e provides a more rigid and stable connection than a variable or helical extender. While variable spacers offer fine-tuning, a fixed tube is superior for locking in a known distance and preventing any possibility of flex or rotation during an exposure.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eExtension Length\u003c\/td\u003e\n\u003ctd\u003e30 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThread Type\u003c\/td\u003e\n\u003ctd\u003eM54\u003c\/td\u003e\n\u003c\/tr\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\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\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\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\"\u003eM54 Extension Tube – 30 mm\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\n\u003cli\u003e\n  \u003cp\u003eThis product is covered by a 2-year manufacturer's warranty against defects in materials and workmanship.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Baader Planetarium","offers":[{"title":"Default Title","offer_id":52913168515357,"sku":"BAA-2958730","price":57.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/BaaderPlanetarium-M54-Extension-Tube-30-mm-1_0314df2d-c524-4102-8036-fc9eb834f35d.jpg?v=1789087013","url":"https:\/\/davidastro.com\/en-us\/products\/baader-planetarium-m54-extension-tube-30-mm","provider":"David Astro","version":"1.0","type":"link"}