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I am experiencing an unfortunate problem with my APO-Summicron 90mm. After a brief portrait session at the office, I left the lens at the camera, over a desk. I almost always use it wide open and occasionally at f/5.6, but this time I went for f/16. When I returned to put it back to the leather case I noticed that the aperture ring was totally loose. It’s now spinning 360 degrees and the aperture blades don’t move at all. I always felt that the ring was too soft for my taste. I’d prefer it to be stiffer. But I never felt that there was a problem. In fact, the lens is still in very good shape a