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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.
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.
Player One M54M-M54M 2MM Adapter

Player One M54M-M54M Adapter - 2mm

by Player One
SKU POA-M54M-M54M-2
$19.00 - $19.00
$19.00
$19.00 - $19.00
$19.00
Price Match Policy!
  • Adds 2mm of Optical Path Length
  • Connects Two M54x0.75 Female Threads
  • Functions as a Spacer and Gender Changer
  • Standard M54 x 0.75mm Thread Pitch
2 in stock
Qualifies for FREE Shipping in CONUS on orders over $350.
  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • M54M-M54M 2MM Adapter

    The M54M-M54M 2MM Adapter provides exactly 2mm of optical path length, converting an M54 female port into an M54 male thread with a standard 0.75mm pitch. This adapter is a fundamental component for achieving precise back focus and connecting M54-threaded accessories in a rigid, secure imaging train.

    Precise 2mm Spacing for M54 Imaging Trains

    This adapter serves a critical dual role in any astrophotography setup using the M54 standard. It acts as both a gender changer, allowing you to connect two components with female M54 threads, and as a fixed 2mm spacer for fine-tuning your back focus distance. Its thin profile is essential when you are just a few millimeters short of the ideal sensor-to-corrector spacing.

    • Back Focus Correction: Use this adapter to make small, precise increases to your imaging train length to achieve perfect star shapes across the field.
    • Component Mating: Securely connect accessories like off-axis guiders, filter wheels, and camera rotators that both terminate in female M54x0.75 threads.
    • Rigid Connection: Machined as a single piece, it provides a non-flexing link between heavy components, maintaining optical alignment.

  • What is the primary use of the M54M-M54M 2MM Adapter?

    The primary use of the M54M-M54M 2MM Adapter is to connect two pieces of equipment that both have female M54x0.75 threads, while simultaneously adding exactly 2mm of spacing to the imaging train. This is common for fine-tuning back focus or mating specific accessories like filter wheels and off-axis guiders.

    How does this 2mm adapter help with back focus on my refractor and field flattener?

    Most field flatteners and reducers have a strict back focus requirement, often 55mm. If your current camera and adapters leave you at 53mm, this M54M-M54M 2MM Adapter is the perfect solution to add the final 2mm needed to reach the optimal distance, ensuring sharp stars to the edge of your frame.

    Can I use the M54M-M54M 2MM Adapter to connect a camera to a filter wheel?

    Yes, if both your camera's front plate and the telescope-side of your filter wheel have female M54x0.75 threads, this adapter will join them. It acts as a male-to-male "gender changer" to bridge the connection while adding 2mm of length.

    What is the thread pitch of the M54M-M54M 2MM Adapter?

    The adapter uses the standard M54 photographic thread pitch, which is 0.75mm. This ensures compatibility with the vast majority of astronomy cameras, filter wheels, and correctors that use the M54 standard.

    Is the M54M-M54M 2MM Adapter threaded for filters?

    No. This adapter is a spacing and gender-changing component. It has male threads on both sides and does not have internal threads for accepting standard 2" (M48) filters.

    Why would I choose a fixed 2mm adapter instead of a variable spacer?

    A fixed adapter like this M54M-M54M 2MM Adapter provides a more rigid and tilt-free connection than most variable spacers. When you know you need exactly 2mm, a fixed spacer is the most secure way to achieve it without introducing potential optical alignment issues.

  • Adapter Type Male-to-Male Thread Adapter / Spacer
    Connection (Side 1) M54 x 0.75 Male Thread
    Connection (Side 2) M54 x 0.75 Male Thread
    Optical Length 2mm

    • M54M-M54M 2MM Adapter

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  • Player One 2-Year Warranty