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What is USM, and what are its Prospros and Conscons?

My Canon lenses have the designation USM on them, which I assume is for the same reason whythat they say Ultrasonic"Ultrasonic". What does this mean, and why or why do I not want it?

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nchpmn

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What doesis USM meanand what are its Pros and Cons?

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dpollitt

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What is an ultrasonic motordoes USM mean?

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chills42

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What is USM, and what are its Prospros and Conscons?

What is USM and what are its Pros and Cons?

What is USM, and what are its pros and cons?

What doesis USM meanand what are its Pros and Cons?

What is an ultrasonic motordoes USM mean?