Yes, that is correct, I have the M42 threads on the telescope side from my reducer, I do not have an OAG. The M48toM42 adapter goes in too far on the T2-M48, both of which came with the camera. When I attach my M42 SCT T-adapter from the telescope side with M42 threads it goes in about 5- 6 mm too far in, so it is not flush with the T2-M48 end. Thus I am short on the total 105 mm that I need. The problem is there is nothing to stop the M48 toM42 adapter from screwing all the way in to the T2-M48, and if I don't screw it all the way down everything is loose. The M48-M42 adapter is missing a flange to keep it from going so far in, or the thread is way too deep on the T2-M48.