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Sigma 100-400mm f/5-6.3 DG DN OS: B&H Photo / Amazon / Adorama Optical limits posted their review of the Sigma 100-400mm f/5-6.3 DG DN OS Contemporary and you can read the entire review here or read the excerpts below. The Sigma 100-400mm f/5-6.3 DG DN OS Contemporary is a subtle improvement over the older DSLR version – both optically […]