K100D Problem

I'm experiencing the same problem. It will take one photo and then start clicking (opening/closing the shutter). After that the viewfinder is blacked out and the aperture on the lens is not fully reopened. I recently sent it back to Pentax for repairs (under warranty). After a week, I called the service dept and they said there was no problems and everything was "within factory limits". I got my camera back the same day of the call. I doubt they did a vigorous examination of the problem. Taking a closer look at the shutter "thingy" inside the camera, it looks like it's not clearing the lens after a shot. Planning on taking it to Ritz Camera and trying another lens to see if that will help. Will keep you posted. Good luck!

Does it actually take photos? If so it sounds like some thing is stuck under the shutter button. Check that there is not some sticky sandwhich filling that is obvious... Suggest a professional clean .
Good luck

megan
hamowen.myphotomax.com

Remove lens, locate silver vertical pin inside of mounting ring on left side as you are looking at camera. Lightly slide black plastic piece which is on the vertical pin downward; if it will go downward remount lens and try camera. If plastic piece will not go down, lightly slide it up and then down and now remount lens and try camera. My guess is that either that component is sometimes stuck or that it may have become mispositioned while removing and replacing a lens.