The Sigma 50mm F1.4 EX DG HSM is a new large aperture, standard prime lens for the latest digital cameras. This lens incorporates HSM (Hyper Sonic Motor), which ensures a quiet and high-speed AF as well as full-time manual focus override. It effectively becomes an 80mm medium telephoto lens on digital cameras with APS-C size image sensors. Price and availability of the Sigma 50mm F1.4 EX DG HSM to be confirmed. Read the whole article here