Battery check and stopped-down metering index mark, Manual aperture control "m" signal (led) – Canon AE-1 User Manual
Page 71
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Battery
Check
and
Stopped-Down
Metering Index Mark
This battery check index mark serves
also as the stopped-down metering index mark
for use with Canon FL lenses and other
similar manual lenses, when exposure measure
ment is performed with a stopped-down
diaphragm. (See page 49.)
Manual Aperture Control "M" Signal
(LED)
When the aperture ring is not set at the
"A" mark, you cannot get the correct ex
posure in AE photography. When the aperture
ring is set at any position other than the "A"
mark, the manual aperture control "M" signal
will blink as a warning. Also, when Canon FL
lenses. Bellows or the like are used, this
warning signal flashes on and off when ex
posure measurement is performed.