Canon A-1 Instructions Manual page 17

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In the case of an FD lens which has a
chrome Breech-lock mount ring or of an
FL lens:
Mounting
1. Make sure the Breech-lock ring is locked
so that it cannot be turned. It will not
mount onto the camera otherwise.
2. Align the red dot of the Breech-lock ring
with the red dot on the camera body
above the camera mount.
3. In this position, fit the rear of the lens
into the camera body and turn the
Breech-lock ring clockwise until it is
tight.
Dismounting
1. Turn the Breech-lock ring counterclock-
wise until it stops.
2. Pull the lens out from the camera body.
When removing a lens, take special care not
to damage the protruding pins and levers
on the rear. With the exception of the Fish-
eye 7.5mm lens, always put a lens down
with the rear facing up.
Whenever you mount an FD lens on the A-1,
its maximum aperture is automatically
transmitted to the camera's AE circuit. Even
if you switch to an FD lens of a different
maximum aperture, the mounting procedure
is the same as that described above and re-
quires no adjustment.
All five AE modes are possible with an FD
lens. See SETTING THE LENS FOR AE
PHOTOGRAPHY. Of the five AE modes,
only stopped-down AE is possible with an
FL lens.
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