M54 Male to M42 Female Adapter

The 2mm thickness of this adapter is perfect for keeping my optical train compact without adding extra back focus issues. Threads on both sides engaged smoothly and securely with no wobble.

Finally a thin 2mm adapter that doesn't add unnecessary back focus to my imaging train. The threads are cut clean and screw on smoothly without any wobble.

The internal M48 threads on the M54 side made connecting my filter to my telescope’s drawtube a lot cleaner than my old setup. Threads engage cleanly with no wobble, and at 2mm thick it adds barely any extra back focus. Charges in about 40 minutes?