Originally posted by stevebrot ...or damage to the mechanism. Any evidence that the lens might have been dropped?
A "lazy" aperture mechanism is not uncommon, but might be expensive to remedy. If the lens was described as being in full working condition, I would contact the seller to negotiate a return or partial refund.
Steve
Steve, now that's the funny part...I actually bought it through a local kijiji or equivalent to craigslist type listing. It was getting dark so I only shot a few pics wide open and did not even consider checking the aperture manually, since the seller repeatedly told me it was great working condition. The lens is spotless, looks like a new lens. I met the seller at his front yard. I then thought to myself that it would be nice to quickly grab a few more shots, but that's after the transaction. Then a big bang on my head after I shot a couple noticing overexposure by using in M mode. I called him, no reply then went back. He didn't like me, only pointed the finger at me that I probably dropped or damaged the lens. Lesson learned while buying private, fully test it and confirm it's functionality...wow, case of getting ripped off. Pretty much my problem now and looks like another $100 to fix it.