I've been experimenting with some MACO 820c IR film in my Hassy. I've noticed that there is almost no frame spacing! At first I thought that I had a bad roll, but now I've run two rolls through the same back and had the same problem. Prior to using the 820c in this back I used some color transparency film in it without a problem. The frames were nicely spaced. I've also noticed that the frames are starting right at the beginning of the roll. I've always loaded films and wound them to the arrow marks on the backing paper and there is usually about 2 - 3 cm of "leader" Am I doing something wrong with this film? Is it known to slip like this? Should I be winding past the marker on the backing paper?