Canon AE-1 Instructions Manual page 27

Film Advance and Shutter Release
Turn the film advance lever until i t stops,
s o the film will advance one frame all in one
motion. The shutter will cock, and the dia-
phragm and mirror will be ready for the next
shutter release, while the frame counter
advances simultaneously to the next number.
By pushing the film advance lever lightly with
the tip of your thumb,
it
will open to its
30" stand-off position away from the camera
body for easy film advance.
While the film is advancing, the shutter will
not be released. Film winding can also be ac-
complished by advancing the lever in short
strokes.
Canon has developed the Power Winder
A
to be used with the AE-1 for automatic film
winding. It greatly increases the automation
and mobility of the AE-1. (See page 67.)