Being a part of the “Art” series, the Sigma 50-100mm f/1.8 Art is a powerful lens complete with excellent build quality, sharp optics, quiet autofocus, and a speedy f/1.8 aperture throughout its entire zoom range. The 50-100mm focal length is equivalent to 75-150mm on a Crop-Sensor (APS-C) body, making this lens an excellent choice for photographers looking for a fast, flexible lens. Along with its sister lens (the vaunted Sigma 18-35mm f/1.8), this is the fastest zoom lens available in the 35mm universe. Designed for APS-C camera systems, the redesigned HSM motor is quiet, fast, and discreet. Whether you’re photographing weddings, portraits, concerts, or mountain climbing, the versatile Sigma 50-100mm f/1.8 Art has you covered. We love the Art series from Sigma and have been impressed by each new lens in the series. This fast zoom is no exception. Try it for yourself and we think you'll agree.