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canon ultrasonic lense

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richfinch | 21:42 Fri 30th May 2008 | How it Works
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whats thew difference between an unltrasonic lense and a normal lense?
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Avatar Image tickledtrout
Ultrasonic are auto focus, using a small motor to drive the focusing ring
21:43 Fri 30th May 2008
Avatar Image alan30
Ultrasonic (USM) refers to motor type for an autofocus lens rather than electromagnetic motor. This type (USM) of motor produces higher torque than a similar-sized conventional electromagnetic motor, and realizes smaller dimensions for the same amount of torque. Major features of ultrasonic motors include and absence of gears, highly precise operation and low noise. Smaller quieter and more precise operation.
13:26 Sat 31st May 2008
Avatar Image shylock73
Perhaps the spelling ie:lens: lense !!
15:19 Sun 01st Jun 2008

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