Any Ideas?

[jimbob644]

I recently used my Contax G2 mounted with a 45mm lens to make some timed exposures. These exposures were anywhere from 2 to 4 minutes each. After development I found my film was fogged. This has happened to me before when I had a 21mm lens attached. I just blew it off -- thought maybe the roll was bad. I've had the camera nearly 5 years without any other problems. This is the first. This problem happens only on long exposures. I've got some light leaking somewhere. Any ideas on the cause? Film window? etc...

 

[Issy]

Daylight exposures (with a ND filter, I assume)?

 

[jimbob644]

Yes. ND filter of 13 stops with the late afternoon sun.

 

[Issy]

Maybe the viewfinder window? Try a test roll with black electrical tape over the film window and the viewfinder to try to partition the problem down.