Originally posted by Wombat I vaguely recall another post about something similar. Turned out the mode dial had some dirt under the contacts and wasn't picking up M mode. In other words, you might be still in TAv, even though the dial indicates you're in M. Does it work properly if you press down gently on the mode dial as you switch to M? Also what sort of lens are you using and is it in A or manual? And you have got A ring enabled? I don't know whether any of those things would affect your problem but it only takes a second to check.
I checked with 2 older lenses. When my F 50 1.7 was in automatic mode I get the shutter and aperture tied together. When I set the aperture with the lens ring, the shutter speed will work properly. The same thing happens with my 100mm macro.
My Pentax 18-250 doesn't have an aperture ring and the shutter and aperture are synced.
The shutter speed dial does work properly with my M 50 1.7 and the green button works the way it always does giving me about a stop and a half under exposure.
So M does work with lenses with the aperture set via the aperture rings, but not when using the auto setting. I'm being very careful to not press the AE lock button.
Okay, now I've played with the AE lock button, wondering if that's what's stuck. Maybe. Turning the camera off then on. I get the synced settings. If I push the AE lock button and take one exposure, then the dials will work properly until I turn the camera off. Distinctly odd.
Removing the battery for a half hour doesn't help. I'll tried resetting the custom menu setting. No help. Might reinstalling the firmware fix this? If so, how is that done?