Canon 155 A User Manual
Page 19
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aperture are set automatically and proper
exposure is obtained from the amount of
light reflected back from the subject.
Preparations for AE Flash with the A-1 or
AE-1
Aperture
Keep the aperture ring of the lens set at the
“A” mark.
* In the case of the A-1 it does not matter
if the AE mode selector is set at Av or Tv.
It also does not matter where the AT dial
is set (except for the “B” setting).