File:Canon EF 17-40mm F4L USM lens.jpg - Wikimedia Commons
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Canon Lens Wars 17mm Focal Length Shootout - Episode 1
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Lens Comparisons Archive - davemclelland.com
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Canon EF 16-35mm f4L IS USM vs Canon EF 17-40mm f4.0L USM Detailed Lens Comparison
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Canon EF 16-35mm f4L IS USM vs Canon EF 17-40mm f4.0L USM Detailed Lens Comparison
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Canon EF 17-40mm f4.0L USM vs Canon EF 16-35mm f2.8L USM Detailed Lens Comparison
