Focus preset, Electronic ring manual control, Ef lenses – Canon EOS-1 User Manual

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Focus preset

Selected large-aperture telephoto

lenses — the EF 200mm f/1.8L, the
EF 300mm f/2.8L, and the EF
600mm f/4L — have a focus preset

function that lets you “lock in” a
focus setting. You can focus on other
shots, then when necessary return

immediately to the preset focus at the
touch of a button.

Compact-Macro EF 50 mm f/2.5

Electronic ring manual control

~Some L series lenses feature elec-

tronie focusing rings together with

the AF mechanism that take advan

tage of the superior operational

capabilities of ultrasonic motors.

With electronic focusing rings, the

focusing motor is driven according

to the electrically-deteeted rotation
of the focusing ring. It’s a system of
power-assisted focus, since as the

EF LENSES