Still doesn't explain frame #1 though.
Mister van hoegh, had not read your reply when I replied, i also think there is a problem with the shutter but it was tested in a special set up in a analog camera shop but this is with the lens off the camera. Still the problem between the negatives. Thanks for your reply. never seen a light leak this tight they tend to spread out. I have also been thinking that it happens during filmtransport that I push the backside so it slightly tilts. maybe when advancing film or while transporting back, I think now next time I tape the camera close. then there still is the black line in picture 1 but that would be the shutter than.
The shutter may not be capped when when it cocks, but the mirror would prevent most light from getting through - which might be why a shop didn't catch the issue. This would explain the "sweeping" effect of the light leak. The MEs are apparently known for shutter issues, but likely it's just sticky from age.
One experiment would be to put a lens cap on when advancing the film. If the light leak between frames disappears then this is certainly the cause of it.
Yashinoff, That sounds very plausible I will start with the lens cap right away. And maybe one evening free clicking the camera, probably it has not been used for a long time. Thank you very much. I would like to copy paste your answer to the dutch part of this site where I also posted this problem, if thats ok with you.
Everybody thanks for your time .
Have the foam seals been replaced on this camera? If not, I would definitely replace them because deteriorating foam will at some point end up on the shutter blades.
You can get old cameras cheap, and the fool's approach is to get another one... which will need a CLA, just like the first one.
If you want a reliable piece of equipment, get a CLA from a competent tech..