Electronic mount, Ef lenses – Canon EOS-1 User Manual
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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