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Old Apr 15, 2008, 4:34 PM   #1
bonjen3
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Join Date: Sep 2007
Posts: 73
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Hi all, could someone explain in plain English what all the numbers mean regarding lenses.
For example what is the difference between a lens with the
canon 40D 17-85mm IS USM Lens and a lens with 18-55mm f/3.5-5.6 IS Lens
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