Hi! Since I've started developing, it's one thing that annoyed the crap out of me. I only get 11 ½ negative on a 16 roll film. The only film I've used is Kodak T-Max 400, developed in a paterson tank on paterson spools. The missing negatives are sometimes visible under very, very bright light - but they're un-scannable. My tiny little research says that the Mamiya m645 1000s is a 6x4,5cm and that should give me 15 or 16 exposures. What am I doing wrong or am I doing something wrong? Is it maybe the spooling of the film? Or the inserting of the film in the camera that's wrong? I can't see this being the cause since I think I'm doing it right. Yeah, I spool it to the arrow. Thanks! Sorry for my sloppy english.