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DPChallenge Forums >> Tips, Tricks, and Q&A >> USM
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AuthorThread
 02/08/2004 04:29:45 AM · #1
What is USM?
 02/08/2004 04:33:45 AM · #2
Ultrasonic motors - commonly found in Canon lenses.

Un-sharpen mask - sharpen your pics
 02/08/2004 04:35:25 AM · #3
Tnx alot!
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