SIGMA 50MM F/1.4 DG HSM ART LENS FOR NIKON F
Aperture Range: f/1.4 to f/16One Molded Glass Aspherical ElementThree Special Low Dispersion ElementsSuper Multi-Layer CoatingFloating System & Large Diameter DesignHyper Sonic AF MotorRounded Nine-Blade DiaphragmThermally Stable Composite MaterialBrass Bayonet MountCompatible with Sigma USB Dock