Originally posted by ckiang
That's why you should use a Nikon camera. It winds the leader all the way IN by default. ID-ing used films will never be a problem now.

If I mid-roll rewind, then I use a film picker to pull out the leader and mark that roll as such. Otherwise, if the film has no leader, it's used. If it has a leader, it's new.

aiyo, so troublesome, selecting leader in or leader out is just a matter of pushing a button mah.