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

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.

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.

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.

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.

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.

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.