Hi I have a problem with my A1 and was wondering if anyone could help me. So bought a canon A1 of ebay and shot 3 films with it which all came out completely blank. I am certain the films were loaded correctly as the camera stopped firing after 36 exposures, and also when I loaded the film the rewind knob turned when I advanced the film. I've just tried opening the back and shooting at a low shutter speed to see what happened but I found that changing the shutter speed doesn't seem to make a difference to how fast the shutter goes, (if it is going) if that makes sense. Any ideas what might be wrong?