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Get information and user reviews for this lens from Amazon: Canon EF 20-35mm f/3.5-4.5 USM Ultra Wide Angle Zoom Lens for Canon SLR Cameras
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. If you ´re primarily shooting landscapes with rather long focus distance settings this will not be much of an issue but for at closer settings you should either choose a small aperture (f/11) or do at least a depth-of-field preview check. Other than that the lens performed according to its class. The zoom range isn ´t all that attractive on APS-C DSLRs but it may be worth a look for 1.3x or FF DSLRs (not tested in this scope). READ FULL REVIEW
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