Ring USM and Ultrasonic


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therat

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Nov 26, 2003
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Bedok
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#1
Hi,

What is the different for the above 2 focus drive term that use in canon lens?
 

Rashkae

Senior Member
Nov 28, 2005
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#2
Check the stickies in the Canon forum category, or Wikipedia.
 

calebk

Senior Member
Jul 25, 2006
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Clementi
#3
USM stands for Ultrasonic Motor.

Ring USM is a subset of USM technology; it is one of the few kinds of USM that Canon has developed.
 

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