Shutter Button; Exposure Counter Dial - Canon 7 How To Use Manual

Shutter Button ...

When the shutter button is pressed, the film can be wound again with the lever after the shutter
is actuated
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Cable release can be attached to the shutter button.

Exposure Counter Dial ...

The film advanced whenever the film winding lever is completely wound and the exposure
counter dial is advanced by one number indicating the number of exposed films. The exposure
counter dial returns to the "S" starting position automatically when the back cover is opened
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