Just pulled 4 blank sheets of film out of my processing drum, along with 2 good negatives. The two good ones were taken with my old Symmar, the bad ones with my new Grandagon 90mm. Pulled the lens out of the bag and tested the shutter - it was firing, the blades were just not opening. A long day's shooting and traveling down the toilet, along with 32 sheets of film. One more thing on the "things to check list" - occasionally dry fire the shutter and see if it opens.