Canon New F-1 Instruction Manual page 59

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26 MULTIPLE EXPOSURES
Note
Multiple exposures are also possible when the AE Power Winder FN or AE Motor
Drive FN is attached to the camera. To release the shuter, use either of the two
shutter buttons of the power drive. To return to normal shooting, cap the lens and
take a blank shot using the camera's shutter button.
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