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Title: A good original
Review: I have compared this to several other wide angles, including the Tamron 17-35 2.8-4 (discontinued but still available), to the 16-35L (version I), and I consider this better than both. Arguably, the 16-35L II is the best Canon has done yet, but if you can find a copy in good condition (I did with a small amount of diligence), I consider the 17-35 a real keeper. Nice rendering of color and contrast, sharp center to near-edges, and without meaningful distortion. Function is smooth like L lenses are notorious for, and it is lightweight to travel with, and the 2.8 continuous aperture--well it is 2.8. Gotta love.
