I have had my 645D since Dec. , really great results, shooting P67 lenses, western sierra,sequoias in the snow etc..
I finally got a 645 lens, the 80-160, and i went to look at the first few frames and for the first time got a sensor/processor problem......
in the example you can see that half the frame is a different color and density from the other half (its exactly half, i measured)......the trouble is in the blue channel only , as you can see if you download the image to photoshop.
i havent got to the bottom of it yet , but i suspect iso 1600 (expanded iso per pentax) , and also the problem occurs in the first two frames only so i suspect that the sensor had not come up to correct operating temperature as the rest of the frames do not have the problem and i had just turned on the camera for the first time in that day.
so, any one else have color mismatches in one frame? at what iso? did you send your camera in?
Thanks,
David T.