Nikon F4 Instruction Manual page 27

Manual rewind
To rewind film manually, pull out film rewind lever (R1), lift film rewind crank and turn
it in the direction of the arrow until the tension is gone, indicating the film leader is
rewound completely back into the cartridge.
Confirm that the R2 lever has returned to original position; if not, move it back into
place.
Open camera back and remove film
cartridge.
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