Setting The Lens For Ae Photography - Canon A-1 Instructions Manual

aperture and shutter speed in the p ro-
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 pict ure.
It is the easiest mode for the beginner.
ln stopped-down AE, you set the ap erture
manually on the Jens aperture ring while the
camera a utomatically selects a shutte r
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, l 77A, 188A,
199A,
533G or
5 77G.
In this mode, the
camera sets both aperture and shutter speed
automatically, eliminating any worries about
guide number calculations and flash syn chro-
niz ing shutter speeds.
The first three
AE modes discussed above
are expla ined in more detail in the following
sections. fo'or more information con cerning
the stopped -down AE and AE flash modes,
please refer to the section entitled S PECIAL -
IZED PROCEDURES.
Please note that shutter priority
AE,
aper-
ture priority AE, programmed AE a nd
J\£
flas h are possible o nly with an
FD
lens and
only when the lens aperture ring is set to the
"A" mark. See SETTING THE LENS FOR
AE PHOTOGRAPHY.
- 33-
Setting the Lens for AE Photography
The fir~t fou r
A F.
modes described <tbove,
i.e. shutter priority
AE,
apert ure priority
AE, programmed AE and AE flash photo-
graphy, are
performed with full
aperture
metering through the lens. This m eans
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 a n
FD lens can be u sed and t h e lens aperture
ring must be set to the "A" mar_ k . To do
this, simply hold in the AE
loc~ pu~
on the
lens while turning the apert ure
nng
lrom t.h e
minimum aperture to the "A" mark. T his
urn l>c done eith er be(ore or after the lens is
mounted on
Lhc
camera.
At
the
"A"
mark,
the aperture ring is locked and cann o t be
turned to anv o ther setting. R everse the
procedure
to ·
disengage the aperture ring
from the "A" mark.