Sigma has announced new addition to its digital optimized DG range of zoom lenses in the form of the APO 70-200mm F2.8 EX DG/HSM. This fast telephoto zoom sports a fixed F2.8 aperture throughout the range, HSM technology for high speed silent focus and four SLD (Special Low Dispersion) glass elements. A new 'digitally optimized' coating is claimed to minimize flare and ghosting when used on a D-SLR, and the lens will be available in Sigma AF, Canon EF, Nikon D, Konica Minolta and Pentax AF mounts...Here
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