In *The Book of Pyro*, by Gordon Hutchings (the creator of PMK developer), he mentions using 3 backs when he shoots rollfilm: one N, one +1.5, the other -1.5. This seems more workable to me than shooting with 5 different rolls in one stop increments. But I do agree, this approach seems a lot better than 6 exp. rolls.(posted 8361 days ago)The only reservation I have is you run the risk of picking up a bit of grit on one of the rolls by having them loose in your camera bag and repeatatively loading and unloading them. You could encounter some terrific scratches. I would, therefore, strongly recommend you keep the rolls in snap-top film containers. Grit is the bane of reloading, so I would also recommend you limit the number of times you reload cassettes to 2 or 3 times.