Sigma 412955 20 mm F1.4 DG HSM Lens for Nikon Camera

The world's first f/1.4 20mm lens for full frame DSLRs Part of SIGMA's ART range of lenses;Aperture Range: f/1.4 to f/16; Rounded 9-Blade Diaphragm Features FLD, SLD and Aspherical glass elements Hypersonic AF for high speed a silent autofocus Made in Japan