Quote Originally Posted by mporter012 View Post
If you were to take 10 images on 50 speed film, for example, and then needed to use fast film, 800 speed for instance - could you unwind the partially used roll of 50 speed and then put it back in at a later point?

Just curious about this. I read that you could, but I can't figure out how you would know when to stop winding, so as not to wind the film entirely into the roll, thus rendering the whole thing useless.

I use a Nikon FE2.

Thanks!
Yes you can. Take a note of the frame counter and write down what number it's on. When rewinding listen and feel for it coming off the take-up spool and then stop rewinding. But even if the leader goes back into the cassette, you can extract it with a leader extractor. When putting it back, put a lens cap on the camera and wind on and shoot to a couple of frames past where you took it out.