Pegasus M68 Male to M68 Male Adapter

This adapter is designed to connect two components that both have female M68 x 1.0mm threads, such as connecting a focuser drawtube directly to a field flattener or rotator. Its main purpose is to add a very specific 1.4 mm of spacing to achieve the correct back focus distance required by your optical system.

The inner M54 x 0.75mm female thread allows you to attach accessories with a male M54 thread directly to the adapter. This is useful for stepping down the connection size from M68 to M54 without needing an additional, thicker adapter, which helps conserve precious back focus.

A 0.1mm difference is generally within the tolerance for most amateur imaging setups, especially with slower optical systems (f/7 or higher). While 1.5mm would be ideal, using this 1.4 mm adapter will likely produce excellent results and is far better than having a significant spacing error. For very fast systems (f/4 or below), that 0.1mm may have a minor impact on corner star shapes.

Both the external M68 male threads and the internal M54 female thread have a standard pitch for astronomical equipment. The M68 threads have a 1.0mm pitch, and the internal M54 thread has a 0.75mm pitch.

Yes, if both your reducer and off-axis guider present female M68 x 1.0mm threads and you need exactly 1.4 mm of additional spacing between them, this adapter is the perfect solution. It provides a rigid, threaded connection that maintains alignment.

Absolutely. The 4 mm thread length on each side provides a secure, load-bearing connection that is more than adequate for large CCD or CMOS cameras. Threaded connections like this are significantly more rigid and resistant to tilt than compression or slip-fit adapters.