Sigma 18–35mm f/1.8 DC HSM Art for APS-C cameras is ideal for landscapes, portraits, still life, studio work, close-ups, and everyday photography. A constant f/1.8 aperture across the zoom range is unique in its class. Internal focusing and zooming keep the lens length constant and the front element non-rotating for filter use. The optical design includes 17 elements with four aspherical and five SLD elements. Super Multi-Layer coating reduces flare and improves contrast. Ring-type HSM autofocus is fast, quiet, and supports full-time manual override. A 9-blade rounded diaphragm enhances bokeh. Included: Sigma 18–35mm f/1.8 DC HSM Art lens, front and rear caps, hood, pouch.