Canon A-1 - Manual (Page 99)

When the highest shutter speed of 1000
flashes in the viewfinder to indicate over­
exposure, turn the AT dial to a smaller
aperture, When a shutter speed of the slow
range flashes in the viewfinder to indicate
underexposure, turn the AT dial to a larger
aperture. The shutter speed value that flash­
es to indicate underexposure depends on the
speed (maximum aperture) of the lens and
ASA film speed.
As in the shutter-speed priority AE mode,
when the light level is too low, both shutter
speed and aperture data will flash on and off
to indicate that no matter what aperture you
set, the meter will not couple in an AE
mode. When the light level is too high, the
shutter speed wall flash on and off even
when the AT dial is set to the minimum
aperture possible. Again, AE photography is
still possible if you change the light level
or switch to a more appropriate film.
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