I have a Planar 50/1.7 MM, which used to focus fine at infinity (sharpest star images I've seen at that aperture), but no longer does. I noticed during recent low-light shooting that at infinity, anything wider than f/4 shows out of focus. I have read the post below, about the 85/2.8, and just want to check that Wilson's advice holds true for this lens, before I start cutting off the rubber. If so, what is the best way to remove it, and can it be done sufficiently carefully that the rubber can be reused, or does it need a new one? Any help much appreciated - this problem is spoiling a super lens.
Thanks,
Mark
Thanks,
Mark