Sigma has announced a new telephoto lens in the shape of the 170-500mm F5-6.3 APO DG. The lens features multi-layer coating, aspherical lenses, SLD glass and rear focus s
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Sigma has announced a new telephoto lens in the shape of the 170-500mm F5-6.3 APO DG. The lens features multi-layer coating, aspherical lenses, SLD glass and rear focus s 