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Get information and user reviews for this lens from Amazon: Sigma 15-30mm f/3.5-4.5 EX DG IF Aspherical Ultra Wide Angle Zoom Lens for Nikon SLR Cameras
A bit of barrel distortion, edge sharpness issues on 35mm bodies at the extremes, and contrast/flare control problems keep this from being a top-of-the-line lens. If you’re expecting this lens to be equivalent to a wider Nikkor 17-35mm AF-S, downgrade your expectations a bit. Performance is a mixed bag. From a sharpness and contrast standpoint, the lens does a quite fine job. For it’s price, this lens performs quite well. “¦ READ FULL REVIEW