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Pegasus M68 Male to M54 Male Adapter - 20mm

Pegasus M68 Male to M54 Male Adapter - 20mm

by Pegasus Astro
SKU PEG-ADAPT-M68M-M54M-20
$35.00 - $35.00
$35.00
$35.00 - $35.00
$35.00
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  • Connects Pegasus Falcon 2 Rotator to M54 accessories
  • Adds exactly 20mm of backfocus to the imaging train
  • M68x1 Male thread on one side
  • M54x0.75 Male thread on the opposite side
  • Features internal M48 threads for 2" filters
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  • Description
  • FAQ
  • Specifications
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  • Warranty

  • M68 Male to M54 Male Adapter (20mm length)

    This Pegasus Astro adapter provides a secure, all-threaded connection from an M68 female port to an M54 female port, adding exactly 20mm of optical path length to your imaging train. It is specifically designed to bridge the gap between the Pegasus Falcon 2 Rotator and accessories like an Off-Axis Guider (OAG), ensuring a rigid connection and precise backfocus spacing.

    M68 to M54 Connection: 20mm of Precise Spacing

    Achieving the correct backfocus is critical for a flat field, and this 20mm adapter is machined to provide that exact distance. The male M68x1 threads attach directly to the Falcon 2 Rotator, while the male M54x0.75 threads connect to the telescope side of most modern OAGs or filter wheels. The design also prevents direct metal-on-metal collision between your primary accessories.

    • Internal M48 Threads: The adapter's inner bore is threaded for standard M48x0.75 (2-inch) filters, allowing you to place a filter in the optical path without needing a separate filter drawer.
    • Black Anodized Finish: A matte black finish minimizes internal reflections, preserving image contrast by preventing stray light from reaching the sensor.
    • Solid Construction: Machined from a single piece of aluminum, the adapter eliminates flexure that can occur when stacking multiple smaller, thinner adapters to achieve the same spacing.

  • What is the primary use for this M68 to M54 20mm adapter?

    This adapter is specifically designed to connect the Pegasus Astro Falcon 2 Rotator (which has an M68 female output) to an accessory with an M54 female input, such as an Off-Axis Guider (OAG) or filter wheel. It adds a precise 20mm of spacing to help you achieve the required backfocus for your camera and reducer/corrector combination.

    How do I know if I need exactly 20mm of spacing for my setup?

    You need to calculate your backfocus budget. Start with the required backfocus of your flattener or reducer (e.g., 55mm). Then, subtract the backfocus of your camera, OAG, filter wheel, and any other adapters. If the remaining distance is 20mm, this adapter is the correct choice for your imaging train.

    Can I place a 2" filter inside this 20mm adapter?

    Yes. The adapter features an internal M48x0.75 thread, which is the standard for 2-inch mounted astronomy filters. This allows you to install a light pollution or narrowband filter directly within the adapter itself, saving space in your imaging train.

    Will this M68 to M54 adapter work with rotators other than the Falcon 2?

    It will work with any rotator or accessory that presents a female M68x1 thread and needs to connect to a device with a female M54x0.75 thread, provided that 20mm is the correct spacing required. However, it was engineered with the Falcon 2 Rotator and common OAGs in mind.

    I'm connecting my Falcon 2 Rotator to a Celestron OAG. Is this the right part?

    It depends on the rest of your imaging train. The Celestron OAG for EdgeHD telescopes has an M54 female thread on the telescope side, making it mechanically compatible. You must confirm through your own backfocus calculation that the 20mm spacing this adapter provides is the exact distance you need to reach the 55mm (or other) backfocus requirement for your specific setup.

    What does "prevents metal collision" mean for this 20mm adapter?

    This means the adapter's length and shoulder design ensure that the body of your Falcon 2 Rotator will not make physical contact with the body of your OAG or filter wheel when fully threaded together. This prevents potential binding, scratching, or damage to your equipment.

  • Adapter Type Male to Male Threaded Adapter
    Telescope Side Thread M68 x 1 Male
    Camera Side Thread M54 x 0.75 Male
    Adapter Thickness (Backfocus) 20 mm
    Internal Filter Threads M48 x 0.75 (2")

    • M68 Male to M54 Male Adapter (20mm)

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  • Pegasus Astro 2-Year Warranty