Stopped-Down Metering
When the AE-1
is
used with Canon
FD
lenses, photography can be performed with
through-the-lens
(TTL)
metering and with AE
coupling. However, with the Canon
FL
lenses
and most accessories such as bellows, ex-
tension tubes, or a microscope adapter,
it
is
necessary to take a stopped-down meter
reading.
Stopping down the lens can be done by
wshing the stopped-down lever until
it
locks.
When the lens
is
stopped-down, press the
shutter button halfway or depress the ex-
posure preview switch and adjust the aper-
ture ring
andlor shutter speed dial until the
meter needle inside the viewfinder
is
aligned
with the stopped-down metering index mark.
Press the shutter button and the photo-
graph will be perfectly exposed. If the
lens
should be mounted on the camera with the
stopped-down lever locked, correct exposure
will not be obtained. In this case, a red
warning mark by the stopped-down coupling
lever inside the camera body
is
visible. After
removing the lens, on the lower part of the
camera body, just below the mirror, this
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