Canon 7 How To Use Manual page 21

Canon 7 accepts any standard 35mm film cartridge as well as the Canon Film Magazine V,
which is available as an accessory.
Lift up the rewind crank. Put the film cartridge into the recess directly beneath the rewind crank.
Press the film rewind crank again to lock the film cartridge in place.
With your thumb on the knurled lower end of the take-up spool, turn the spool clockwise until the
film is taut.
Close the back cover, which locks automatically
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