Hello, my name is Philip, and this is my first posting to this forum. i have a lens problem which i hope i can find the solution here. I have the old version MTO 10cm f10 mirror lens which i bought new many years ago. the problem with it is that when i attach my M42 mount cameras to it, the camera is slanted. i understand that it is possible to fix this problem by loosening some screws on the lens and realign the lens correctly. however, i do not know which screws to loosen. i have tried loosening the 2 screws where the tripod collar is, but the collar did not come loose. So far, my solution to this problem was to not tighten the camera body to the lens completely. I would appreciate if someone could help me with this problem.