I goofed....what to do?
I have a Mamiya 7 and 7II. Up until yesterday, I have always used 120 film in them. Yesterday when I was in the middle of something, I put a roll of 220 into the 7II without changing the camera to 220. Will I have to waste half of a roll? Right now I stopped at #7. Any advice? I know it isn't the end of the world if I loose half of a roll of film, but I'd like to know for future reference.