Canon A-1 User Manual

Page 140

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3. Full Aperture Signal Pin

This pin transmits the maximum aperture of

the lens to the exposure meter to set the

meter coupling range automatically.

4. EE Switch Pin
When the “A” mark of the aperture ring is

set to the aperture index, the EE switch pin
comes out to insure that the lens, at this

setting, can be mounted only on cameras

designed for AE photography.

5. Reserved Pin

This pin is designed for use with additions to
Canon’s camera system that may be develop

ed in the future.

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