Originally Posted by davidde1000
So I recently acquired a nice M3. However, some of my lenses are focusing short of infinity, and others are fine. My Konica 50/2 and Jupiter 3 are noticeably short of infinity. My 90/2 Summicron is a tiny bit short of infinity. The Voigtlander lenses are fine. All of the above lenses have good infinity focus on an M7. Is there something that could explain this? Thanks!
Taking your post literally, if they work very well on the M7 the most likely logical explanation is that the body register of the M3 is off spec.
That's probably not what you mean but it's the correct answer for what you've said. Perhaps you could elaborate.