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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.
Player One M54M-M54F Adapter - 17.5mm
Player One M54M-M54F Adapter - 17.5mm

Player One M54M-M54F Adapter - 17.5mm

by Player One
SKU POA-M54M-M54F-17.5
$35.00 - $35.00
$35.00
$35.00 - $35.00
$35.00
Price Match Policy!
  • Optical Length (17.5mm): Adds a fixed 17.5mm of spacing, a common requirement for achieving 55mm back focus with filter wheels and off-axis guiders.
  • M54x0.75 Threads: Features both male and female M54x0.75 threads, the standard for full-frame cameras and correctors, ensuring a wide, unvignetted light path.
  • Rigid Connection: Provides a non-flexing extension, maintaining optical alignment more securely than variable or sliding adapters.
  • Lightweight Design: Adds minimal weight to the imaging train, reducing the potential for focuser sag or balance issues.
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Downloads
  • Warranty

  • Player One M54M-M54F Adapter - 17.5mm

    The Player One M54M-M54F Adapter creates a precise 17.5mm of optical path extension for imaging trains using the M54x0.75 thread standard. This component is essential for achieving exact back focus distances required by field flatteners and focal reducers, particularly when assembling a full-frame imaging system.

    M54 Extension Adapter: Adding 17.5mm of Back Focus

    This adapter is a fundamental component for assembling a rigid, correctly spaced imaging train. It provides a fixed 17.5mm extension, which is often the exact distance needed to bridge the gap between a corrector and a filter wheel or off-axis guider to reach the standard 55mm back focus distance.

    Utilizing the M54x0.75 thread standard, this adapter is designed for full-frame imaging systems. The large-diameter threads prevent vignetting that can occur with smaller M48 adapters when using sensors with a large diagonal, ensuring your flat frames are even and your stars are sharp to the corners.

  • How do I use the Player One M54M-M54F 17.5mm adapter to achieve standard 55mm back focus?

    This adapter is a key part of the back focus calculation. For example, if your camera has 17.5mm of native back focus and your filter wheel/OAG assembly has a 20mm optical path, adding this 17.5mm adapter will bring your total spacing to exactly 55mm (17.5mm + 20mm + 17.5mm). Always calculate the total optical path of all components in your imaging train.

    Is this 17.5mm adapter compatible with a ZWO full-frame filter wheel and an ASI6200 camera?

    Yes. The M54x0.75 threads are directly compatible with ZWO's M54 filter wheels and full-frame cameras like the ASI6200 or ASI2600 series. This adapter is a common solution for achieving the correct 55mm spacing in such a setup, connecting the corrector to the filter wheel.

    What are the threads on the Player One 17.5mm M54 adapter?

    The adapter has M54x0.75 male threads on one side and M54x0.75 female threads on the other. This allows it to function as a simple extension tube between any two M54-threaded accessories.

    Can I stack multiple Player One 17.5mm adapters?

    While physically possible, it is not recommended. Stacking multiple threaded adapters can introduce opportunities for tilt in the imaging train. For maximum rigidity and alignment, it is always best to use a single spacer of the correct length whenever possible.

    Will this M54 adapter cause vignetting with my full-frame sensor?

    No. The M54 thread standard provides a clear aperture large enough to fully illuminate full-frame sensors (36mm x 24mm) without vignetting. This is its primary advantage over smaller M48 adapters, which can clip the light cone on large sensors.

    Why would I choose a fixed 17.5mm adapter instead of an adjustable spacer?

    A fixed adapter like this provides a more rigid and stable connection. Adjustable spacers can sometimes introduce sensor tilt or flex under the weight of a heavy camera. If you know you need exactly 17.5mm of spacing, a fixed adapter is the most reliable option for maintaining perfect optical alignment.

  • Optical Length 17.5mm
    Male Thread M54 x 0.75
    Female Thread M54 x 0.75
    Adapter Type Extension Tube / Spacer
  • Player One 2-Year Warranty