Reviews and Problems with Canon EF 20-35mm f/3.5-4.5 USM
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Overall quality 6
Build quality 6
Canon EF 20-35mm f/3.5-4.5 USM - Review / Test Report
13 October 2008
Conclusion: It is a little difficult to find a verdict for the Canon EF 20-35mm f/3.5-4.5 USM. The lens is capable to deliver a very high resolution which surely originates in the rather conservative zoom ratio. However, at the wide-end it suffers from very pronounced residual aberrations so you may run into situations where you cannot exploit the potential of the lens.