Aperture scale on the at dial – Canon A-1 User Manual
Page 66
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Aperture Scale on the AT Dial
The aperture scale on the AT dial is calibrat
ed in f/stops ranging from f/22 to f/1.2. The
f/1.2 setting is indicated by a dot. The dial
click-stops at both full and half f/stops. It
will not turn past the largest and smallest
f/stops. The maximum aperture indicated on
the AT dial is large enough for any Canon
lens.
Under
certain
conditions
in
the
aperture
priority AE mode, the maximum and mini
mum apertures on the lens have priority over
the
aperture
set
on
the
AT
dial.
For
instance, if the aperture you have set on the
AT dial is larger than the maximum aperture
of the lens in use, the camera will match the
shutter speed to the lens maximum aperture
rather than the aperture you have set on the
AT dial for correct exposure. Thus, if you
are using an FD 50mm f/1.8 lens with the
AT dial set to f/1.4, the camera will use
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