Canon F-1 Instructions Manual page 20

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4
Turn the film advance lever and wind the film around
the film take-up spool.
5
Check to insure that the teeth of both the take-up spool
and the film advance sprocket engage the perforations
in the film.
6
Close the back cover. If the film is slack, the cartridge
will rise and the back cover will not close.
7
Leave the lens cap on and take two blank shots, each
time turning the film advance lever and releasing the
shutter. The frame counter will advance from the "S"
mark to "0". With one more advance, the camera will be
ready for the first shot.
Checking Correct Film Loading
The film is properly loaded and advanced if the film
rewind crank rotates when you wind the film advance
lever. If the film rewind crank does not rotate, take out
the film and reload it.
20