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Get information and user reviews for this lens from Amazon: Sigma 28-70mm f/2.8 EX DG IF Aspherical Lens for Nikon SLR Cameras
Like the Sigma 24-70mm f/2.8 EX DG Lens, the Sigma 28-70mm f/2.8 EX DG lens is a well-built, well-spec’d lens with a value price. But, giving up 4mm of focal length range on the wide end results in a much more compact lens. In addition, the 28-70 is priced noticeably lower than the Sigma 24-70. Autofocus is loud but reasonably fast – and is consistently accurate on stationary subjects. AI Servo performance on active subjects proved to be poor – with few keepable shots. The Sigma 28-70mm f/2.8 EX DG Lens is very soft wide open – especially in the upper half of the focal length range. … This lens performs best at 28mm where the results are decent. CA (Chromatic Aberrations) are very well controlled, flare is not. … Vignetting results are normal for lenses with specs similar to the 28-70 with full frame users noticing some corner darkening when shooting wide open. Like the Sigma 24-70, I find the Sigma 28-70 to overexpose by about .2 f-stops on average. The Sigma 28-70mm f/2.8 EX DG Lens is a very well built lens for a reasonable price. Primarily due to mediocre image quality, I do not intend to include this lens in my Canon General Purpose Lens Recommendations. If you consider this an f/4 or f/5.6 lens, you *might* be happy with what you get for the price. READ FULL REVIEW