I have cut it out of older cameras, and the F4 has a manual rewind option, but I want to make sure before I pop the back that the R1 (or is it R2?) button will release the spool for me to cut it out and remove it...
I have a roll of Tmax that has been half shot for awhile. I want to cut out and develop what I have shot so far, but save the rest to be shot later. Tmax is expensive.
So you just need to open R1 put camera in a dark bag or darkroom, open back, cut film, take film off of take up spool and put in developing spool, then tank.
I usually just nip the corners on the leader of film still in the canister, so it doesnt catch, close the back and press start to load it up.