I just received this lens after won a bid on ebay today but the C330F which I received early is on CLA. After inspect the cosmetic condition, I start to test the lens and found 2 issue. 1. When the M-X syncro selector is at "X", everything looks fine. But when I turn to "M" I cock the shutter and push the release lever, the cock hit back but not fully and the diaphram don't open and close as it should. I have to push "a little" so the diaphram will work, open and close according to speed I set. Is this normal? 2. Does this lens aperture ring has click stop? On 80/2.8 blue dot it has, but this 55 I just got hasn't. Thanks for the answer in advance.