Canon EOS-1 Instrukcja Użytkownika Pobierz pdf (Strona 31)

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li 1 *

EF 300mm //J’.Si

USM

Some L series lenses employ an

ultrasonic motor that handles AF

operation within the lens. USM

incorporates a ring-shaped motor.

As it is a direct-drive system with no

gearing units, operation is fast and

reliable. Added to the fact that there

are no mechanical couplings

between the lens and camera body,

this technologically-advanced lens

focusing system allows astonishingly

quick, precise operation. Greater

compactness and operational

simplicity are realized by using low

rotational speed and high torque.

thereby eliminating the need for

a braking unit. Beyond being quick,

focusing operation is also virtually

noiseless.

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