Canon A-1 - Manual (Page 58)

aperture and shutter speed in the pro­
grammed AE mode. This mode is helpful
when your only goal is correct exposure
and neither depth of field nor control of
movement are very important in the picture.
It is the easiest mode for the beginner.
In stopped-down AE, you set the aperture
manually on the lens aperture ring while the
camera
automatically selects a shutter
speed for correct exposure. This is a big
advantage when using non-FD lenses and
in specialized areas of photography such
as photomacrography and photomicro­
graphy.
AE flash photography is possible with the
Canon Speedlite 133A, 155A, 177A or
199A. In this mode, the camera sets both
aperture and shutter speed automatically,
eliminating any worries about guide number
calculations and flash synchronizing shutter
speeds.
The first three AE modes discussed above
are explained in more detail in the following
sections. For more information concerning
the stopped-down AE and AE flash modes,
please refer to the section entitled SPECIAL­
IZED PROCEDURES.
Please note that shutter priority AE, aper­
ture priority AE, programmed AE and AE
flash are possible only with an FD lens and
only when the lens aperture ring is set to the
“A” mark. See SETTING THE LENS FOR
AE PHOTOGRAPHY.
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