Canon A-1 - Manual (Page 23)

Attaching a Cable Release
A cable release is a device which, used in
conjunction with a tripod, allows the shutter
to be held open for long exposures without
your ever having to touch either camera or
shutter button directly. This is especially
useful for reducing the chances of blurred
images in copy work, photomacrography
and photomicrography.
The A-1 is provided with a socket for a cable
release in the center of the shutter button.
The cable release simply screws into this
socket. The main switch must also be at the
“ A ” setting.
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