Canon AE-1 Instructions Manual page 41

Up to this point you have been reading other existing photosensitive elements, you
about the fundamental principles of A € will find i t covers a greater range of lighting
photography. W e ask you to continue reading situations and allows for greater accuracy. In
through the following, more detailed de- order to provide the AE-1 with the best
scription of AE photography for a fuller possible magnetic release system, Canon de-
understanding. This information will prove veloped a special circuit for instantaneous
light metering. Due to this innovation, even in
A silicon photocell is used a s the photo-
place a s dark a s E V l (at ASA 100, f11.4. 1
sensitive element in the camera. If you sec.), metering can be performed in only
compare the silicon photocell
(SPC)
with 0.04 second.