Sigma 50-100mm f/1.8 DC HSM Art Lens for Nikon F

Features F-Mount Lens/DX Format 75-150mm (35mm Equivalent) Aperture Range: f/1.8 to f/16 Four SLD Elements, Three FLD Elements One High-Refractive Index Element Super Multi-Layer Coating Hyper Sonic Motor AF System Fixed, Rotating Tripod Collar Rounded 9-Blade Diaphragm This Nikon F-mount Sigma 50-100mm f/1.8 DC HSM is an Art-series zoom mixing impressive versatility with advanced optics. The bright f/1.8 constant maximum aperture offers consistent low-light performance throughout the zoom range and also affords greater control over focus placement for shallow depth of field and selective focus applications. The optical design incorporates a series of low dispersion and high-refractive index elements, which help to achieve high clarity and sharpness by suppressing various aberrations, color fringing, and distortion. A Super Multi-Layer Coating has been applied, too, which controls lens flare and ghosting for improved contrast and color accuracy. Balancing the optical merits, thi