Get a copy of Lura White's book on IF Photography. I can't remember the exact title, but it is very good with lots of examples. Unless she has updated the book in the last few years, it does not cover the MACO films, but much of what applies to Konica 750 is similar for MACO 820.(posted 8543 days ago)Fogging of IR films is a nusance, but occurs rapidly with age and improper handling. With 35mm film, I've found that it is best to wind off the first 6 exposures before starting to shoot. And keep it frozen until about 2-3 hours before you are ready to load.