Canon AT 1 User Manual
Page 101
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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.
Full Aperture Signal Pin
This pin transmits a signal indicating the
maximum aperture of the lens.
Automatic Aperture Lever
This lever closes down the aperture.
It couples with the stopped-down coupling
lever.
EE Switch Pin
This pin protrudes when the aperture ring
is set at the "A" mark. In this position, it
transmits a signal for AE photography. When
the aperture ring is set at the "A" mark, the
lens can be attached only to the Canon EF,
AE-1, and the F-1 equipped with the Servo
EE Finder. If the lens is attached to the
AT-1, it cannot be set at the "A" mark.
Reserved Pin
This pin is designed for use with acces
sories that may be developed in the future.