Lens signal.coupling, Aperture signal lever, Full aperture signal pin – Canon AE-1 User Manual
Page 96: Automatic aperture lever, Ee switch pin, Reserved pin
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Lens Signal.Coupling
Aperture Signal Lever
This lever transmits the actual f/stop to
the exposure meter. It is coupled to the
aperture ring just the same as when the
aperture ring is not set at the "A" mark.
Full Aperture Signal Pin
This
pin
transmits
the
signal
corres
ponding to the lens at the full aperture
opening.
Automatic Aperture Lever
This
lever
closes
down
the
aperture,
coupled
with
the
stopped-down
coupling
lever.
EE Switch Pin
This pin protrudes when the aperture ring
is locked at the "A" mark. In this position, it
transmits a signal for AE photography.
Reserved Pin
This pin is designed for use with ac
cessories that may be developed in the future.