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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 M48 Female Adapter

Pegasus M68 Male to M48 Female Adapter

by Pegasus Astro
SKU PEG-ADAPT-M68M-M48F
$27.50 - $27.50
$27.50
$27.50 - $27.50
$27.50
Price Match Policy!
  • Connects M48 (2-inch filter) accessories to M68 focusers
  • M68x1 Male Thread
  • M48x0.75 Female Thread
  • Maintains a rigid, non-flexing connection
1 in stock
Qualifies for FREE Shipping in CONUS on orders over $350.
  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • Adapter M68 Male to M48 Female

    This Adapter M68 Male to M48 Female provides a simple, secure solution for integrating standard M48x0.75 accessories into an optical train that uses the larger M68 thread standard. By converting the large male M68 thread to a female M48 thread, you can directly attach popular cameras, filter wheels, and off-axis guiders without introducing flexure.

    Secure Your Imaging Train: Converting M68 Threads to the M48 Standard

    Many high-end focusers and field correctors terminate in a large-aperture M68 thread to prevent vignetting with full-frame sensors. This adapter steps that connection down to the widely used M48 female thread, often called the "2-inch filter thread," which is the standard for a vast range of astrophotography equipment. This single, machined piece ensures a rigid connection that is critical for maintaining optical alignment and preventing tilt, especially with heavier imaging payloads.

    Maintaining Optical Alignment with a 0.75mm Pitch

    The adapter features a standard M48 thread pitch of 0.75mm, ensuring full compatibility with accessories from virtually any manufacturer. The precision-cut threads allow for a tight, secure fit that won't loosen during an imaging session. This solid metal-on-metal contact is superior to multi-part adapters or push-fit solutions, which can introduce slight shifts in the optical axis as the telescope tracks across the sky.

  • What is the primary use for this Adapter M68 Male to M48 Female?

    Its primary function is to connect astrophotography accessories with a male M48 thread (like a camera nosepiece, filter wheel, or off-axis guider) to a telescope focuser or corrector that has a female M68 thread. It allows you to use your standard 2-inch accessories on larger-format optical systems.

    Will this M68 to M48 adapter work with my specific brand of focuser?

    This adapter is designed to work with any focuser, corrector, or accessory that utilizes a standard M68 female thread. Likewise, the female side is a standard M48x0.75 thread, which is compatible with the vast majority of astronomy cameras, filter drawers, and other 2-inch barrel accessories.

    How much length does this Adapter M68 Male to M48 Female add to the optical path?

    While the exact optical path length is not specified, thread adapters like this are typically designed to be as thin as possible while maintaining structural integrity. You should assume it adds a few millimeters to your back focus distance. Always measure your final imaging train to ensure you are within the correct back focus tolerance for your flattener or reducer.

    Can I use the Adapter M68 Male to M48 Female to attach my DSLR camera to a refractor with an M68 focuser?

    Yes. If your DSLR camera has a standard M48 T-ring, you can thread the T-ring directly into the female M48 side of this adapter. This will allow you to securely attach your camera to the M68 focuser drawtube, providing a much more rigid connection than a standard 2-inch push-fit adapter.

    Is the thread pitch on this adapter standard?

    Yes, the female side uses an M48x0.75 thread. The 0.75mm pitch is the industry standard for 2-inch astronomy filters and accessories, ensuring wide compatibility.

    I have an off-axis guider with male M48 threads. Can I connect it to my Takahashi telescope's M68 corrector using this adapter?

    Absolutely. This is a perfect use case. You would thread the M68 male side of the adapter into your telescope's corrector, and then thread your M48 off-axis guider into the female M48 side of the adapter. This creates a secure, all-threaded connection for your entire imaging train.

  • Male Thread M68
    Female Thread M48
    M48 Thread Pitch 0.75mm

    • Adapter M68 Male to M48 Female

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