Canon A-1 User Manual
Page 33
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, 188A,
199A, 533G or 577G. In this mode, the
camera sets both aperture and shutter speed
automatically, eliminating any worries about
guide number calculations and flash synchro-
nizing 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.
Setting the Lens for AE Photography
The first four AE modes described above,
i.e. shutter priority AE, aperture priority
AE, programmed AE and AE flash photo-
graphy, are performed with full aperture
metering through the lens. This means
that the diaphragm is fully open during
metering for easiest viewing and opera-
tion.
For correct operation in these four full-
aperture metering AE modes, only an
FD lens can be used and the lens aperture
ring must be set to the “A” mark. To do
this, simply hold in the AE lock pin on the
lens while turning the aperture ring from the
minimum aperture to the “A” mark. This
can be done either before or after the lens is
mounted on the camera. At the “A” mark,
the aperture ring is locked and cannot be
turned to any other setting. Reverse the
procedure to disengage the aperture ring
from the “A” mark.
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