The Sigma 50mm f/1.4 EX DG HSM Autofocus Lens for Sony & Minolta is a high quality, professional optics and youll know it the minute you pick it up. In the past few years, camera manufacturers have overlooked the need for a reasonable fast prime lens that is compact enough for everyday use, yet provides the necessary image quality to meet the highest expectations. Now, with the advent of the APS-C cameras, the long popular 50mm focal length takes on double duty as a portrait length lens of approximately 90mm on most of the small chip cameras. At a fraction of the size, weight and cost of comparable lenses, this is a lens that you might have on your digital SLR at all times.