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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.
Pegasus M68 Male to M54 Male Adapter

Pegasus M68 Male to M54 Male Adapter

by Pegasus Astro
SKU PEG-ADAPT-M68M-M54M
$27.50 - $27.50
$27.50
$27.50 - $27.50
$27.50
Price Match Policy!
  • Connects M68x1.0 accessories to M54x0.75 components
  • Male-to-male thread design for direct coupling
  • 4mm thread length on both M68 and M54 sides
  • Internal M48x0.75 threads for standard 2-inch filters
2 in stock
Qualifies for FREE Shipping in CONUS on orders over $350.
  • Description
  • FAQ
  • Specifications
  • In the Box
  • Downloads
  • Warranty

  • Adapter M68 Male to M54 Male

    This precision-machined Adapter M68 Male to M54 Male solves critical spacing and connection challenges in complex imaging trains. It directly converts the larger M68x1.0mm thread standard to the common M54x0.75mm pitch with a 4mm thread length on each side. The adapter also features an internal M48x0.75mm thread, allowing you to place standard 2-inch filters directly within the optical path.

    M68 to M54 Conversion: 1.0mm and 0.75mm Pitch Standards

    The primary function of this adapter is to bridge two different large-format thread sizes common in high-end imaging. The male M68 side features a 1.0mm pitch and 4mm of thread length, ideal for connecting to large correctors or flatteners. The male M54 side uses the standard 0.75mm pitch over a 4mm length, ensuring a secure fit with popular filter wheels, off-axis guiders, and camera rotators.

    Integrated M48 Filter Path: A 2-inch Filter-Ready Core

    A key feature is the internal M48x0.75mm threaded bore, which passes through the adapter. This allows you to install a standard 2-inch astronomy filter inside the adapter itself, saving space and potentially reducing back focus requirements compared to a separate filter drawer. This is particularly useful for one-shot color cameras or when a single filter is used for an entire session.

  • What is the primary use for the Adapter M68 Male to M54 Male?

    This adapter is designed to connect a component with a female M68x1.0 port, like a large format field flattener or reducer, to an accessory with a female M54x0.75 port, such as a filter wheel or an off-axis guider. The internal M48 thread also allows for the integration of a 2-inch filter.

    Can I use the Adapter M68 Male to M54 Male to install filters with my full-frame camera?

    Yes, the internal M48x0.75mm threads are the standard for 2-inch mounted astronomy filters. This allows you to place a filter within the adapter, which is an efficient way to add filtration to an imaging train that terminates in a full-frame camera attached via M54 connections.

    Will this adapter cause vignetting with my large sensor?

    While the M68 and M54 openings are designed for large sensors, using the internal M48 filter thread can introduce vignetting on sensors larger than the APS-C format, especially with fast optical systems. The clear aperture is defined by the M48 thread, so it's best suited for full-frame sensors when used without a filter installed.

    What is the optical length of the Adapter M68 Male to M54 Male?

    The specifications do not list the optical length. The adapter's contribution to back focus will be its overall physical length minus the length of the male threads that recess into the connecting components. This must be measured for precise back focus calculations.

    How do I attach this adapter between my Riccardi Reducer and ZWO filter wheel?

    If your Riccardi reducer has a female M68x1.0 output and your ZWO filter wheel has a female M54x0.75 input, this adapter will work perfectly. You would thread the M68 male side into the reducer and the M54 male side into the filter wheel to create a solid, direct connection.

    Is the pitch on the M54 side of the Adapter M68 Male to M54 Male compatible with M54 camera adapters?

    Yes, the M54 thread has a pitch of 0.75mm, which is the industry standard for most M54-threaded astronomy accessories, including filter wheels, off-axis guiders, and camera-specific T-rings. This ensures wide compatibility.

  • M68 Thread Male, Pitch 1.0mm, 4mm length
    M54 Thread Male, Pitch 0.75mm, 4mm length
    Internal Thread M48 x 0.75mm (for 2" filters)

    • Adapter M68 Male to M54 Male

      × 1

  • No downloads are available for this product.

  • This product is covered by a 1-year manufacturer's warranty against defects in materials and workmanship.