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Pegasus Adapter M54 Male to M48 Male

Pegasus Adapter M54 Male to M48 Male

by Pegasus Astro
SKU PEG-ADAPT-M54M-M48M
$25.32 - $25.32
$25.32
$25.32 - $25.32
$25.32
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  • Connects M54 female threads to M48 female threads
  • Adds only 2.0mm of back focus to your imaging train
  • Standard 0.75mm thread pitch for wide compatibility
  • Male-to-male design for connecting two female-threaded components
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • Adapter M54 Male to M48 Male

    This Adapter M54 Male to M48 Male provides a critical connection between two common astronomy thread sizes, adding only 2.0mm of optical path length. Its male-to-male design bridges M54 and M48 female-threaded components with a standard 0.75mm pitch and a secure 4mm thread length, ensuring a rigid, light-tight fit in your imaging train.

    Precision M54 to M48 Conversion at only 2.0mm Thickness

    The primary function of this adapter is to solve thread mismatches without disrupting critical back focus. By converting an M54 female port to an M48 male thread, it allows you to connect 2" filters, filter wheels, or correctors to larger focusers and rotators. Its minimal 2.0mm thickness consumes a negligible amount of your available back focus, making it an essential tool for complex imaging setups where every millimeter counts.

    Standard 0.75mm Pitch for Secure Connections

    This adapter is machined with a standard 0.75mm thread pitch, the most common standard for photographic and astronomical accessories. This ensures compatibility with a wide range of equipment from nearly every manufacturer. The 4mm thread length provides ample engagement for a secure, non-flexing connection, preventing tilt and maintaining optical alignment between your components.

  • What is the primary use for the Adapter M54 Male to M48 Male?

    This adapter is used to connect a component with a female M54 thread (like a focuser or rotator) to a component with a female M48 thread (like a filter wheel, off-axis guider, or field flattener). It acts as a gender-changer and size-reducer in one compact unit.

    How will the 2.0mm thickness of this adapter affect my back focus?

    The adapter adds exactly 2.0mm to your optical path. You must account for this when calculating your back focus. For example, if your flattener requires 55mm of back focus, and your camera sensor is at 17.5mm, you will need 37.5mm of spacers. If you add this adapter, you will now need only 35.5mm of additional spacers.

    Will this M54 to M48 adapter cause vignetting with a full-frame sensor?

    Because the adapter steps down from a larger M54 thread to a smaller M48 thread, it can potentially introduce vignetting on sensors larger than APS-C, especially in fast optical systems (f/5 or lower). M48 threads are typically the bottleneck for full-frame sensors, so while this adapter enables the connection, you should verify the clear aperture of your entire imaging train.

    Is the 0.75mm thread pitch compatible with my existing gear?

    Yes, a 0.75mm pitch is the de facto standard for M48 ("2-inch filter thread") and M54 accessories in astrophotography. This ensures it will be compatible with nearly all correctors, extenders, and camera adapters on the market.

    Can I use the Adapter M54 Male to M48 Male to connect my M48 camera to an M54 focuser?

    Yes, this is a perfect application. If your focuser drawtube ends in a female M54x0.75 thread, and your camera or corrector train begins with a female M48x0.75 thread, this adapter will bridge the two components securely.

    What is the advantage of a 4mm thread length on this adapter?

    The 4mm thread length provides a robust and secure grip between components. This is more than the typical 2-3mm found on some adapters, helping to prevent tilt and ensure all connected equipment remains perfectly orthogonal to the optical axis, which is critical for sharp images across the field.

  • Adapter Type Male M54 to Male M48
    Optical Thickness 2.0mm
    Thread Pitch 0.75mm
    Thread Length 4mm

    • Adapter M54 Male to M48 Male

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  • Pegasus Astro 2-Year Warranty