The Sigma 24-70mm f/2.8 DG OS HSM Art Lens is a versatile zoom lens designed for Nikon's latest SLR cameras. A constant f / 2.8 maximum aperture throughout the zoom range for greater control over depth of field and a wide range of useful focal lengths (wide-angle to portrait) make this lens a versatile tool for everyday shooting. For greater clarity and clarity, the popular Art lens series utilizes a sophisticated optical design that includes three SLD elements and four aspherical elements to reduce chromatic and spherical aberrations, color fringes, distortion and other anomalies. Super Multi-Layer Coating is used to suppress lens flare and ghosting for accurate color reproduction and high contrast. A protective coating is also applied to the front element for operation in harsh climates. The aspherical elements used in the Sigma AF 24-70 f / 2.8 DG HSM OS Art are subjected to a high-precision level of polish. This process creates high image quality and beautiful circular bokeh. In addition to imaging capabilities, the lens is equipped with a Hyper Sonic motor to provide fast, smooth and quiet autofocus or manual focusing. The new OIS system also helps with handheld shooting by minimizing the appearance of camera shake for clearer images. The lens barrel uses a heat-resistant composite material for durability over a wide range of conditions, and a brass bayonet mount ensures rigidity and precision in mounting.