Canon A-1 User Manual
Page 116
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priority AE. You will see the shutter speed
you have set on the AT dial. The aperture
displayed 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.