Sigma 50mm F/1.4 DG HSM, a pro level lens. Ideal for portrait, landscape, studio and street photography. Redesigned and reengineered and become a new start for Art lens. Hyper Sonic Motor (HSM) enables quiet, smooth and accurate autofocusing. Also Special Low Dispersion (SLD) and Super Multi-layer coating. Close-up photography done at minimum distance of 40cm. While 13 elements in 8 groups allow best performance at wide apertures. Sigma USB dock along with optimization Pro software fine tune focusing parameters. Compatible with full-frame and APS-C sensor digital cameras. The sigma 50m f/1.4, the new exceptional standard prime lens.