Phillipe, I'm not sure if "trick" is the correct word; perhaps "caution" is more appropriate. And most experienced readers will already be aware of what I'm about to say, but saying it here may help some novices (or inattentive types like myself) retain more keepers. The trick? -- When changing films, never be in such a hurry as to inadvertenly toss a fully exposed role into a canister you had previously marked, "start at #13". When you reach for that cannister a week or so later, you tend to forget what was in it. You wind up with some very interesting shots (23 of them in my case), but like I suggested -- very few keepers. CK Nikonian in Ontario P.S. Anyone know any use for photos of chipmunks morphing into moose??