I finished developing a superpan 200 Roll a few minutes ago.To my surprise, all except 3 randomly spaced frames were completely blank! it looked as if all but 3 frames worth film was exposed to daylight before developing. the three pictures which did come out are both properly exposed and do not look overprocessed.
I am wondering what might have caused
this.
I've been having the same problem with my Canon AE-1, and it was driving me nuts. Sometimes I would get 1 or 2 frames blank, other times I would get an entire remaining half of a 36 exp roll completely blank. It wasn't until I started shooting long exposures in bulb mode that I figured out the problem...
One day while shooting 2 second and longer exposures, after just 10 frames into the roll the shutter refused to stay open (using a cable release). I tried a few more frames in bulb mode, but the shutter would immediately snap shut at what sounded like a speed faster than 1/60th. I pressed the battery check button and it showed the battery was good. I rewound the rest of the film, opened the back of the camera, pointed the camera towards the light and fired the shutter. No light came through the lens opening...completely black. I noticed both first and second shutter curtains traveled across in sync, never leaving a gap to expose the film. Bad shutter. Off to Joe Careta for warranty servicing.