The Sigma 50-150mm f/2.8 EX DC APO HSM II lens is a fast telephoto zoom lens made exclusively for the cropped sensor DSLR camera. It aims to give the equivalent of 70mm to 200mm focal length (in terms of 35mm equivalent). A lot of people question the sharpness of this lens (due to the reduced optic size of this lens) and doubt that it can beat the excellent 70-200mm lens. Can this lens do it? See the full report here at http://www.photoseis.com/sigma-50-150
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