A constant f/2.8 aperture across the 17-50mm range, paired with a 4-stop optical stabilizer, makes this Sigma a solid choice for low-light shooting on APS-C Sony A-Mount bodies. Its HSM motor delivers quiet, fast autofocus, while the 7-blade diaphragm and Super Multi-Layer Coating help control bokeh and flare. Best for portrait and video work, where its stabilized aperture and 565g weight balance well on a DSLR.
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