I see there's another
thread where a few people have chimed in with an issue that I seem to be sharing.
I'm having a similar issue, where the mirror will sporadically stick when I'm shooting wide open on faster (mainly f/2.8) lenses. Usually happens with the first shot taken (operating temperature doesn't seem to matter), and really starts happening in either of the burst modes. I'll fire off a 5-7 shot burst, and the mirror seems to kind of "stick" in the middle, and then everything lags for a few seconds. During that time, the VF is either black, or blurry looking. After those few seconds, the mirror seems to correct itself, and then I can shoot again. These are the lenses it happens on:
Tamron 17-50mm f/2.8
Pentax M 50mm f1.7
Tamron 90mm f/2.8
Pentax M 50mm f/2
Sigma 50mm f/2.8 MF
Sigma 50mm EX DG f/2.8
So definitely not an isolated lens, and it doesn't happen on any of my slower lenses, and goes away on the faster lenses if I shoot one-stop faster than wide-open. I'm also hearing a low buzz while the camera is processing a run of shots taken in burst mode. Just started noticing this today while we were out hiking, and am certain I would have heard it before (I shoot a lot of burst mode). I just re-flashed the firmware, but it's still happening. Anything else I should be looking at, or something to try for a fix?
Camera was purchased last February, so I'm still good under the 1 yr. warranty. I'll wait to see if anybody out there has any suggestions, and if not, I'll start trying to figure out the RMA process.
Thanks.
Last edited by esrandall; 01-01-2015 at 06:59 PM.
Reason: Ha!