Canon EOS-1 - Manual (Page 30)

Electronic mount
The EOS system’s fully electronic
EF mount lens combines the speed
and reliability that are essential for
high-quality AF operation. In terms
of accuracy and dependability, the
electronic mount far out-performs
the systems used by other autofocus
SLRs. Communications between
lens and camera body can be trans­
ferred at high speed. Moreover,
essential information about the lens
in use is sent to the camera’s
microprocessor as soon as the lens is
mounted, allowing all basic prepara­
tions to be completed immediately.
With the lens’ focal length, maxi­
mum aperture, AF/manual mode
entered, as well as information on
shooting modes, whether or not a
flash is mounted, etc., the camera’s
microprocessor can perform all rele­
vant calculations, make the neces­
sary decisions, and send instructions
to the lens, which then instantly
activates AF and aperture-setting
operations.
Moreover, the fully electronic
mount offers the advantage of pro­
viding compatibility with the more
intelligent systems of the future.
EF LENSES