Review: Canon 20mm f/2.8 USM
By
Andrew Alexander, The Imaging Resource
(Wednesday, July 30, 2008 - 15:59 EDT)
 The Canon 20mm f/2.8 is a small wide-angle lens, first introduced by Canon in 1992. It uses a design of 11 lens elements in 9 groups, and the use of a floating rear focusing system improves AF performance by not requiring the movement of many elements. To read this review, click here.
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