Sigma has just taken the wraps off several exciting new prime lenses for most of the major mirrorless camera systems, except Canon.The big news for anyone who’s looking for a bright, affordable prime lens for street or portraiture is Sigma’s new pair of Contemporary series lenses. The 17mm f/4 DG DN ($599 / £549) and 50mm f/2 DG DN ($639 / £619) are both full-frame lenses that are designed for Sony’s E-mount and the L-Mount favored by Panasonic and
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