Skip to content
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.
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 M42 Female Adapter

Pegasus M68 Male to M42 Female Adapter

by Pegasus Astro
SKU PEG-ADAPT-M68M-M42F
$27.50 - $27.50
$27.50
$27.50 - $27.50
$27.50
Price Match Policy!
  • Converts M68x1 Male Threads to M42x0.75 Female T-Threads
  • Standard 0.75mm Pitch for Universal T-Ring Compatibility
  • Maintains a Secure, Non-Flexing Connection
  • Precision-Machined for Optical Train Alignment
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 M42 Female

    This Adapter M68 Male to M42 Female provides a simple, secure solution for integrating standard T-thread accessories into larger optical systems. It directly converts a male M68 thread to a female M42 T-thread, featuring the universal 0.75mm pitch required for compatibility with DSLR T-rings, filter wheels, and off-axis guiders.

    M68 to M42 Conversion with a Standard 0.75mm Pitch

    The primary function of this adapter is to bridge the gap between large-format focusers, correctors, or flatteners that terminate in M68 male threads and the vast ecosystem of M42 accessories. The female side features a standard M42x0.75mm thread, ensuring you can securely attach your existing imaging equipment without introducing flexure or misalignment into the optical path. This single-piece component is essential for creating a robust, all-threaded connection from your telescope to your camera.

  • What is the main use for the Adapter M68 Male to M42 Female?

    This adapter allows you to connect accessories with a male M42 T-thread (like a DSLR T-ring, a guide camera, or a filter wheel) to a telescope focuser, field flattener, or other component that has a female M68 thread. It steps down the larger format to the more common T-thread standard.

    How do I connect my Canon DSLR to a focuser with M68 threads using this adapter?

    You will need two components: this M68 to M42 adapter and an M42 T-ring for your specific Canon EOS model. First, thread the adapter onto the M68 male thread of your focuser. Then, thread the Canon T-ring onto the female M42 threads of the adapter. Finally, attach your camera body to the T-ring's bayonet mount.

    Is the M42 thread on this adapter a standard T-thread?

    Yes. The M42 female thread has a pitch of 0.75mm, which is the universal standard for astronomical T-threads. This ensures compatibility with the vast majority of T-rings and imaging accessories on the market.

    Will this adapter add significant length to my imaging train?

    Adapters like this are designed to be as thin as possible while maintaining structural integrity. While it will add a small amount of optical path length, it is typically minimal and must be accounted for when calculating back focus. Always measure your specific setup to ensure you can reach focus.

    Can the Adapter M68 Male to M42 Female be used visually?

    While primarily designed for imaging, it could be used in a visual setup if you have a specific need to connect an M42-threaded accessory, such as a T-threaded eyepiece holder, to an M68 output. However, for standard visual observing, a dedicated M68 to 2" eyepiece adapter is typically used.

    Is this adapter strong enough for a heavy camera and filter wheel?

    Yes. A fully threaded connection, which this adapter provides, is significantly more secure and rigid than using set-screws or compression rings. It is designed to support the weight of typical DSLR or dedicated astronomy camera setups without sagging or flexure.

  • M42 Thread Pitch 0.75mm

    • Adapter M68 Male to M42 Female

      × 1

  • No downloads are available for this product.

  • This product is covered by a 2-year manufacturer's warranty against defects in materials and workmanship.