I tried a pre-AI 35/2.8 PC lens on my FE2. Unlike most pre-AI lenses it will fit AI cameras, without modification. The lens barrel touches the cameras meter coupling lever, but the lever was in no danger of being damaged. As long as the lever does not move when the PC lens is mounted, your exposures should be right on. I imagine the coupling lever on the FE2 is pretty similar to that of the F70, F90 etc, so it should work on these cameras too. Just be careful and don't force anything! Roland.
