I can't say for sure, but the first time I pulled the data off my F5 it only had 30-some-odd rolls in its memory. Since I THINK that it can hold 100 rolls and if it runs out of space, it deletes the oldest(by default-this is one of those "hidden" custom functions you can change with PhotoSecretary or Meta35) sequentially, and also from my experience it doesn't "reset" the roll count when you download fresh data, I think that's probably the actual usage of the camera. In any case, I don't seem to have too much issue with the eyepiece working loose on mine, although out of habit I do check it occasionally. IMO, one of the best things Nikon has done in terms of "all the little things" was the eyepiece redesign with the D2 series that added a lock to them. This, of course, was also used on the F6 and all subsequent round eyepiece DSLRs. Of course, by 2006 they did still make cameras without a locking eyepiece-the F5 was still cataloged(don't know if it was actively in production) along with the F100 and the small eyepiece FM3a. Post 2006, though, Nikon hasn't cataloged a round eyepiece camera without a lock.