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Jeff Cable's Blog: Comparing the new Canon EF 16-35mm f/4 USM IS lens to my older Canon EF 16-35mm f/2.8 II USM lens - Should I switch?
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Canon EF 17-40mm lens - Wikipedia
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Ron Martinsen's Photography Blog: COMPARISON: Canon 16-35mm f/4L IS vs 16-35mm f/2.8L II
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