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Amazon.com : Canon EF 17-40mm f/4L USM Ultra Wide Angle Zoom Lens for SLR Cameras : Camera Lenses : Electronics
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Lifetime Review of the Canon EF 17-40mm f/4L USM Lens | Fstoppers
Canon EF 17-40mm f/4L USM lens review: Popular high-performance option - DXOMARK
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The Canon EF 17-40mm F/4.0L USM Lens Review - YouTube
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