ethics_gradient
Well-known
Some Iskras, mine included, have a problem with light leaks in either the supply or takeup film chamber. There is at least one thread about this on this forum. Apparently the light leaks around loose edge of the camera's covering, along the edge where the front cover opens. I fixed it on mine ( at least I think have filxed it) by lining the film chambers with thin black foam from a light seal kit.
What sort of fogging does this produce? I got a Super Ikonta on eBay that would shoot the first 3-4 frames normally, partially fog the next 3, and then the rest would be totally fogged. Couldn't for the life of me figure out what was doing it (I had guessed it might be one of the film chambers leaking), had to return it.