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Canon EF 17-40mm F/4L USM - Canon lens (Focal length 17-40mm, aperture f 4-22, 2.4X optical zoom, diameter: 77mm) Black. Canon L Series Professional L Stock Photo - Alamy
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Canon EF 17-40mm f/4L USM Ultra Wide Angle Zoom Lens for SLR Cameras: Amazon.co.uk: Electronics & Photo
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