erichard
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One thing to consider is that you may be focusing past infinity due to the thickness of the adapter. It is possible on at least some Contax lenses to adjust where the barrel stops rotating for infinity. If it goes too far, you may hit the mirror, but if you don't go far enough, while you may clear the mirror, you won't reach infinity. So I had one case where I adjusted the infinity exactly, and this happened to be just enough to clear the mirror. You'd have to do a search to see how it would be done for this particular lens, and I'm not sure if such a discussion exists. It was not difficult for the Contax 28/2.8 .
When you hit the mirror, the short term effect that I either noticed or imagined was that the microadjust calibration was thrown off for my lenses just a hair, and only temporarily (maybe a day or two?). I also think that the reason the mirror hangs one way and not the other is that going up is powered by a quick motor, while going down is probably enabled by just a small return spring. So the upshot being that when going up, it powers the mirror past an obstacle that normally would stop it if only a mild force were applied, but given the larger force, the mirror mechanism is forced backwards somewhat as the mirror scrapes by, probably knocking the alignment out temporarily until all the plastics and metal eventually flex back to their neutral state a day or so later. That may all be my imagination, but that's what I've noticed (mainly noticed while trying to get consistent microcalibration over many lenses, one being an alt that hit the mirror, and what I kept getting was inconsistency).
If I had the problem, and I knew how to easily adjust the infinity stop, that's where I'd begin, before hacking at the lens or mirror. This is not suggested much if ever here, so I thought I'd toss it out.
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