I use alot of Delta 400 in 220 size in my 645n. No problems with the film after I learned that the film must fit tight on the takeup spool when you first load (to allow all the remainder of the film to wind on tight as you shoot...I was getting edge fogging before I did this). If you are using XTOL developer you MUST remember to use at least 200 mls of stock for each roll 220...thats twice as much as you must use for 120 or 35mm.(posted 8838 days ago)