Nikon F6 Instruction Manual page 33

For mid-roll rewind,
To rewind film manually using the film rewind crank,
Film rewind knob
No lock is available for the film rewind knob on this camera. Make sure that the knob
is down before rewinding film.
Pictures taken on frames beyond the film's indicated number of
exposures may be discarded in the process of developing.
CSM d2: The F6 can be programmed to not automatically begin film rewind
when it reaches the end of a roll (execute film rewind by pressing the film
rewind buttons) (
CSM d3: Film leader can be set to remain outside the film cartridge when it is
rewound ( 101).
CSM d4: Film advance can be changed to stop at the 35th or 36th frame
( 102).
46.
101).
47.
33