Canon A-1 - Manual (Page 65)

Manual Override
You may have occasion to wish to cancel the
A-1's AE capabilities to control exposure,
both aperture and shutter speed, by your-
self. This will be the case if you are using a
separate exposure meter, if you wish to
correct exposure in unusual lighting con-
ditions or in flash photography, or if you
want to control exposure for creative ef-
fects.
With the A-1, this is a simple process. Using
an FD lens, first disengage the aperture ring
from the “A” mark. Set the AE mode
selector to TV. The Av setting is useless.
Set the aperture by turning the lens aperture
ring, and set the shutter speed by turning the
AT dial. When you press the exposure
preview switch or the shutter button half-
way to preview the exposure, the data dis-
played in the viewfinder will be the same as
if the camera was in shutter priority AE.
You will see the shutter speed you have
set on the AT dial. The aperture dis-
played is that that the camera would select
on Auto. Although the aperture you have
manually set on the aperture ring is not
displayed, it is at that aperture that your
picture will be exposed when you press
the shutter button. You will also see the red
“M” inside the viewfinder to indicate that
you are in the manual mode.
To operate the camera manually using an FL
lens or any other lens without a full aperture
signal pin, set the AE mode selector to TV.
With these lenses you must always set the
aperture by turning the lens aperture ring. In
the case of these lenses, the digital readout is
unreliable, and it is better to cut it out
altogether by switching off the viewfinder
display lever. You must rely on your own
experience for setting the exposure.
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