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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.
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.
Baader M55/M68 Adapter for 2" Baader Mirrors & Prisms

Baader M55/M68 Adapter for 2" Baader Mirrors & Prisms

by Baader Planetarium
SKU BAA-2956110
$77.00 - $77.00
$77.00
$77.00 - $77.00
$77.00
Price Match Policy!
  • Converts Baader 2" diagonals to a rigid M68 threaded connection
  • Attaches to the M55 female thread on the diagonal body
  • Provides a standard M68 x 1 male thread for accessories
  • Replaces the original 2" nosepiece and eyepiece holder
  • Eliminates flexure and tilt in demanding imaging setups
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Downloads
  • Warranty

  • Baader M55/M68 Adapter for 2" Baader Mirrors & Prisms

    The Baader M55/M68 Adapter transforms your Baader 2" diagonal from a standard slip-fit eyepiece holder into a rigid, fully threaded M68 connection point for serious imaging. This single component replaces both the 2" nosepiece and eyepiece clamp, attaching directly to the diagonal's M55 housing thread to create an uninterrupted, secure optical train.

    A Fully Threaded Connection: From M55 to the M68 System

    For astrophotography, any source of tilt or flexure can degrade image quality, especially with heavy cameras or complex filter wheels. This adapter solves that problem by eliminating the 2" slip-fit compression ring mechanism entirely. By converting the diagonal's native M55 thread to the large-format M68 (Zeiss) standard, you can directly attach correctors, reducers, and off-axis guiders for a connection that will not sag or shift during an exposure.

    Installation on Baader 2" Diagonals

    This adapter is designed specifically for Baader's 2" mirror and prism diagonals. Installation is straightforward: simply unthread and remove the original 2" nosepiece (or ClickLock clamp) and the M55/2"/S58 ring from the diagonal's body. The M55/M68 adapter then screws directly into the exposed female M55 thread on the diagonal housing, providing a robust M68 male thread ready for your imaging accessories.

  • Why should I replace my Baader 2" ClickLock with this M55/M68 adapter?

    While the Baader ClickLock is excellent for fast and secure visual use, a fully threaded connection is superior for astrophotography. The M55/M68 adapter creates a rigid, non-flexing link between your diagonal and imaging equipment, which is critical for preventing tilt when using heavy cameras or long accessory trains.

    Will this Baader M55/M68 adapter work with my Celestron or other brand 2" diagonal?

    No, this adapter is designed specifically for the M55 thread size and flange distance found on Baader Planetarium 2" diagonals. It is not compatible with diagonals from other manufacturers, which use different threading or have non-removable eyepiece holders.

    What accessories can I connect to the Baader M55/M68 adapter?

    The adapter provides a standard M68 x 1 male thread. This allows you to connect any component from the Baader M68 system, including extension tubes, reducers, and adapters for specific cameras or coma correctors, creating a versatile and robust imaging setup.

    Does installing the Baader M55/M68 adapter change the optical path length?

    Yes, replacing the original eyepiece holder with this adapter will alter the optical path length. You will need to account for this change when calculating back focus for your specific reducer or corrector. Refer to the Baader M68 system charts to determine the precise path length of your new configuration.

    How can I use the Baader M55/M68 adapter to attach my M48 filter wheel to my SCT?

    You would thread this adapter onto your Baader 2" diagonal, which is attached to your SCT. This gives you an M68 male thread. From there, you would use a Baader M68 to M48 adapter (sold separately) to connect your filter wheel, ensuring a secure, all-threaded connection from the telescope to your camera.

    Can I use the Baader M55/M68 adapter on both sides of the diagonal?

    Yes, if you have a Baader 2" diagonal with removable, threaded adapters on both the telescope and eyepiece side, you can use two of these M55/M68 adapters to create a full M68-to-M68 "pass-through" diagonal for specialized imaging applications.

  • Net weight (kg) 0.03
    Compatible Brands Baader Planetarium, Zeiss
    Inner Diameter / Clear Aperture (mm) 50.8 (2")
    Outer Diameter 68
    Type of Adapter Expanding Adapter
    Optical length (mm) 1
    Outer Connection (eyepiece/-camera-sided) M55
    Outer Connection (lens sided) M68 x 1
    Adapters Family M68 System
  • Baader Planetarium Warranty