M42M-M48F 22.5mm Extender

The 22.5mm thickness is just right for getting the correct backfocus with my filter wheel setup. Threads were smooth and the connection to my camera feels solid.

Finally got my ASI2600MM Pro spaced correctly for the filter wheel, and this extender threaded on perfectly with no backfocus issues. The 22.5mm thickness was exactly what I needed to dial in the setup.

This 22.5mm spacer was exactly what I needed to get the spacing right between my filter wheel and camera, and the threads are smooth without any wobble. Only minor gripe is that it could use some blackening on the inside edges to cut down reflections, but it does the job perfectly for the price.