I made a dumbass mistake today. I went to load my Yaschica Mat with film but I forgot that there was already a half-shot roll inside. Needless to say, the film in the camera is spoiled. I wound the roll through and sealed it as normal then marked the roll "SPOILED." (I'll probably use that roll for experiments or something.) I'm just wondering for knowledge sake, how much of the film was actually destroyed? In a 35 mm. the film that's still inside the cartridge is still all right. If you screw up like that with a 35 mm. You can just close the camera back up, waste three frames and keep shooting. At least the frames at the tail end will still be good. If you're lucky, some of the film that's wound up at the center of the takeup spool might still be all right. I was indoors, sitting at the dining room table when I screwed up. No lights or lamps on in the house. Only window light. So, when you screw up with a Yashica/Rollei style TLR camera with 120 format film, how much of the film actually gets zapped? Can you, at least, recover and keep shooting like you can do with 35 mm?