The staple Sigma 50mm 1.4 DG HSM has been redesigned and reengineered to set a new standard for the art line. With a large 1.4 aperture, the Sigma 50mm 1.4 prime lens is a Pro level performer for shooting everything including portrait photography, landscape photography, studio photography and street photography. A hyper sonic motor (HSM) ensures quiet, smooth and accurate autofocusing and paired with special low dispersion (sold) glass and super multi-layer coating, The 50mm 1.4 is a high performance lens for the modern DSLR sensors. 13 elements in 8 groups allow for unsurpassed performance even at wide apertures and close-up photography is easily managed with a minimum focusing distance of 40cm. The Sigma 50mm 1.4 lens is the new exceptional standard, Standard prime.