markc said:
I don't know what equipment you are using, but modern Canons use an infrared LED to count sprocket holes, so you can tell the camera to leave the leader out when rewound, write down the last image count on the canister, and then advance up to where you left off without being able to tell by looking at the negs. The spacing is just as if you had left the film in the whole time.
I dont think all canons do that. I bought a canon rebel 2000 a few months ago and when I use the mid roll rewind feature, it puts the leader back in the roll, and im not sure if theres a way to stop this. The manual says nothing about that. Be nice if it did, cuz otherwise I have to go to the film developing place to have them take the leader out for me, and I gues that puts stress on the film.