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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 M48F-M54M Adapter - 17.5mm
Player One M48F-M54M Adapter - 17.5mm

Player One M48F-M54M Adapter - 17.5mm

by Player One
SKU POA-M48F-M54M-17.5
$29.00 - $29.00
$29.00
$29.00 - $29.00
$29.00
Price Match Policy!
  • Provides a precise 17.5mm of optical length
  • Connects M48x0.75 female threads to M54x0.75 male threads
  • Enables use of 2-inch filters in larger M54 imaging trains
  • Machined for a secure, tilt-free connection
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • Player One M48F-M54M Adapter - 17.5mm

    The Player One M48F-M54M Adapter provides exactly 17.5mm of optical path length, converting a male M54x0.75 thread to a female M48x0.75 thread. This component is essential for achieving precise back focus when connecting M48-threaded accessories, such as 2-inch filter wheels or drawers, to imaging trains that terminate in a larger M54 thread.

    Precision 17.5mm Spacing: Integrating M48 Accessories into an M54 Imaging Train

    This adapter solves a common connection problem for imagers using mixed-thread components. It allows you to integrate accessories built around the ubiquitous M48 (2-inch filter) thread standard into an optical path designed for larger M54 correctors, off-axis guiders, or camera ports.

    The fixed 17.5mm length is a standard increment used in back focus calculations, often in combination with other spacers to reach a flattener's required 55mm distance. Its rigid, machined construction ensures that your imaging components remain perfectly collinear, preventing tilt that can compromise edge-of-field star shapes.

    • Standard Thread Conversion: Adapts the common M48x0.75 female thread found on filter wheels and correctors to the M54x0.75 male thread used on larger focusers and cameras.
    • Fixed 17.5mm Extension: Provides a precise, non-negotiable 17.5mm of spacing, simplifying back focus calculations by removing guesswork.
    • Secure Connection: Machined threads ensure a rigid, tilt-free connection between critical optical components, which is vital for maintaining a flat field.

  • What is the primary use for the Player One M48F-M54M 17.5mm Adapter?

    Its primary function is to connect an accessory with M48 male threads (like a filter drawer or the camera-side of a flattener) to a component with an M54 female port (like a large off-axis guider or focuser drawtube), while adding exactly 17.5mm to the optical path for back focus purposes.

    How does the Player One 17.5mm adapter help achieve correct back focus?

    Many field flatteners and coma correctors require a precise 55mm distance to the sensor. This 17.5mm adapter is a common length used in combination with other standard spacers and the camera's own flange distance to precisely hit that critical target.

    I have a Player One filter wheel with M48 threads and a corrector with an M54 port. Is this the right adapter?

    Yes, this is a very common application for this adapter. The M48 female side will thread onto your filter wheel's male threads, and the M54 male side of the adapter will connect to your corrector, providing 17.5mm of spacing. Always confirm your total back focus calculation to ensure this is the correct length for your specific setup.

    Will this Player One M48F-M54M adapter accept standard 2-inch astronomy filters?

    Yes. The female thread is M48x0.75, which is the international standard for mounting 2-inch astronomical filters. You can thread a filter directly into the female side of this adapter if needed.

    My camera has 17.5mm of back focus. Can I use this Player One adapter to connect directly to an M54 flattener that needs 55mm spacing?

    No, not by itself. If the flattener requires 55mm of spacing and your camera already provides 17.5mm, you need a total of 37.5mm of spacers (55 - 17.5 = 37.5). This 17.5mm adapter would be one part of that solution, but you would still need an additional 20mm of spacers in the imaging train.

    Are the threads on the Player One 17.5mm adapter M48x0.75 or M48x0.6?

    The female thread is M48x0.75, the standard for 2-inch astronomical filters and accessories. The male thread is M54x0.75.

  • Adapter Type M48 Female to M54 Male
    Female Thread M48x0.75
    Male Thread M54x0.75
    Optical Length 17.5mm

    • Player One M48F-M54M Adapter (17.5mm)

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