EF 17–40 mm F 4L USM: Canon EOS M Talk Forum: Digital Photography Review
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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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Canon EF 17-40mm f/4L USM
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Canon EF-S 17-55mm f/2.8 IS USM Lens 1242B002 B&H Photo Video
