My Tamron 17-35 recently screwed up majorly. I have no idea what went on inside, but I went out on a full day (which seemed to be going perfectly), framed up a shot, hit the focus button – it would NOT focus. For some reason the area that the focus ring was supposed to be at was PAST infinity. I took a closer look, and my aperture ring was off-track.
So, doing what any insane photographer that wants his lens to work would do, I opened the lens up, thinking that the worst case scenario would leave me $300 down and since my job involves photography, that wouldn’t be too bad.
Turns out, for some reason, the track that my aperture ring sits on was cracked and the ball bearing had become lodged into some evil area. No idea how this happened, since I have it tacked at 22 and let the camera control the f-stop.
So, I had to choose whether I should glue it, or discard the cracked fragment. I just tossed it out. Unfortunately, in the process of getting everything to work, the tiny, tiny ball bearing slipped out of my grip and flew to the floor. Not even a strong magnet could find it.
So, now I had no way to lock my aperture ring in place. It sucked, but I could live since I just keep it tacked stuck to 22. I replaced everything, closed it up, put the screws in, and fastened the aperture ring to 22 with some electrical tape (it has a tiny spring mechanism, so without the ball bearing, it doesn’t stick).
Works fine now, but I figured I’d share my pain.