Originally posted by Royce Howland It sounds to me like the 645D shutter is failing. I had a failed shutter in one of my 645D's, and it started out more or less like you described -- a bad shutter sound, occasional delays in exposing the shot, black frames, wildly inaccurate exposures in other frames as the shutter would stick open or closed, false firings of the shutter, etc. If this is the case for you, you will have to send the camera to Pentax for servicing. My shutter replacement was done under warranty, but I was quoted a $1000 CDN cost if warranty had not covered it...
thanks it sound a bad situation.
my camera is not under warranty. but the shutter is 25000 click and the camera is advertised for 50000, don't know if this is important, but i expect they change it free or i don't see the point of guarantee a 50k shutter live.