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Review title: Excessive vignetting with f2.8, take the full frame 17-35 f2.8-4 rather!
Product review: I returned this lens in fast succession as I saw the extent of vignetting, which it causes. Especially with f2.8 the problem is extreme with all focal length.You might verify this finding on several well known online sites, such as Photozone (dot de, not dot com!). The well known author of this site measures on a Nikon D200 whopping 1.4 steps darkening of the edge. He uses Norman Koren's Imatest software. Even on Canon it is still 1.0 step darkening (Canon uses a smaller sensor size, scale factor 1.6 versus Nikon's 1.5.)Do yourself a favor and take rather the quite excellent 17-35 f2.8 Di full 35mm frame! You will like your images much more, and you will be able to use the same lens with film bodies as well.
