The Sigma 17-70 OS lens is a lens that is anticipated by many photographers. The old version of this lens received warm reception from professional and enthusiast photographers alike because of its focal length and light weight. The new version has the Optical Stabilization feature or the OS feature. Can this lens beat the old version in terms of optical quality? Discover the answer here >> http://www.photoseis.com/sigma-17-70-os
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