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IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.
Baader Planetarium M54 Extension Tube – 10 mm
Baader Planetarium M54 Extension Tube – 10 mm
Baader Planetarium M54 Extension Tube – 10 mm

Baader Planetarium M54 Extension Tube – 10 mm

by Baader Planetarium
SKU BAA-2958710
$52.00 - $52.00
$52.00
$52.00 - $52.00
$52.00
Price Match Policy!
  • Adds a fixed 10 mm of optical path length
  • M54 female (M54x0.75) and male (M54x0.75) threads
  • Prevents vignetting with larger imaging sensors
  • Machined for rigidity and precise spacing
1 in stock
Qualifies for FREE Shipping in CONUS on orders over $350.
  • Description
  • FAQ
  • Specifications
  • In the Box
  • Downloads
  • Warranty

  • M54 Extension Tube – 10 mm

    The 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.

    Achieve Critical Back Focus with 10 mm of Extension

    Back 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.

    Secure Connections for M54 Full-Frame Imaging Gear

    The 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.

  • What is the primary use for the M54 10 mm Extension Tube?

    The primary use is to add exactly 10 mm of spacing 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.

    My 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?

    Yes, 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.

    Will this M54 extension tube cause vignetting with my full-frame camera on a large refractor?

    No, 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.

    Does the M54 10 mm Extension Tube have both male and female threads?

    Yes. 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).

    Why choose a fixed 10 mm M54 tube over a variable extension?

    A 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.

    Can I stack this 10 mm tube with other M54 extensions?

    Yes, 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.