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Ultrasonic Motor
Canon's Ultrasonic Motor (USM) was the world's first
lens-based motor to harness ultrasonic oscillation energy.
Electronic vibrations created by a piezoelectric element power the
mechanical action of the lens. This technology makes focusing
precise, virtually noiseless and incredibly quick – some lenses
focusing literally faster than the human eye. The USM starts
instantaneously and stops the moment focus is achieved, with no
overshooting. What's more, the USM requires minimal battery power
so you can shoot for longer on a single charge.
Two types of USM are used in Canon EF lenses: Ring-type USM and
Micro USM. Ring-type USM is found in large-aperture and super
telephoto lenses, while Micro USM is used in more compact
lenses.
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Click here to find out more about the Canon EF Lens Range and
Technology.
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