Changing the lens – Canon AE-1 User Manual
Page 95
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Changing the Lens
FD lenses incorporate a safety mechanism
to
prevent
the
bayonet
ring
and
the
diaphragm blades from moving when the lens
is not mounted on the camera. To bypass this
safety mechanism, press the lock pin in the
top recess of the bayonet mount while turning
the bayonet ring. Once this safety mechanism
has thus been cancelled, you can see the
diaphragm blades move when activated.
Since FD lenses have signal pins and
levers which couple with the camera body,
special care must be taken not to damage
them. One basic precaution is to always put
the lens down facing down whenever you
must change lenses.
The following lenses cannot be used with
the built-in meter because the extended rear
part of the lens will push in the lens speed
adjustment pin on the camera body:
FL 19mm f/3.5
FL 35mm f/2.5
FL 50mm f/1.8
FL 58mm f/1.2
R 35mm f/2.5
R 50mm f/1.8
R 100mm f/2