Canon A-1 - Manual (Page 74)

Multiple Exposures
Making two or more exposures on the same
frame is an exciting technique which is very
simple to perform with the A-1. After
making the first exposure, do not turn the
film advance lever but return it to its
retracted position close to the camera body.
Switch the multiple exposure lever under-
neath the film advance lever to the left. A
red dot will appear indicating that the
camera is set for a multiple exposure. Now
turn the film advance lever. The film will
remain stationary, holding its exact position.
At the same time the shutter will be re-
cocked, and the multiple exposure lever will
automatically return to its original position
over the red dot. When you press the shutter
button, your second shot will be in exact
registration over the first. If you turn the
film advance lever, the camera will be set for
the next frame.
You can make any number of exposures on
the same frame simply by repeating the
above procedure before turning the film
advance lever. There is a possibility of a
slight movement of the frame if you make
an excessive number of exposures on the
same frame, if you turn the film advance
lever too forcefully or if there is film slack.
The frame counter is stopped until you
actually advance the film to the next frame.
Once you have set the camera for a multiple
exposure, there is no way to cancel the
process before actually making it. If you
suddenly decide you don't want a multiple
exposure but still want to preserve the one
or several shots you have already made on
the frame, you have the best chance of doing
that if you manually set the lens aperture
ring to the minimum aperture, the shutter
speed to 1/1000 sec., cover the lens with the
lens cap and then release the shutter.
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