Canon EF 17-40mm f/4L USM Ultra Wide Angle Zoom Lens for Canon SLR Cameras… 4.6 out of 5 stars CONSUMER REVIEWS(272) 17-40mm ultra-wide-angle zoom lens with f/4 maximum aperture for Canon SLR cameras 3 aspherical lens elements and super UD glass element create superior optics in all conditions Powerful ring-type ultra-sonic monitor (USM) produces [...]
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