Sigma 14mm f/1.8 DG HSM Art Lens for Nikon F BOSE while the rounded nine-blade diaphragm

while the rounded nine-blade diaphragm design contributes to bokeh effects in images

8 prevents dust and water droplets from entering the lens

Fits a standard 10 inch dinner plate

The Hyper Sonic AF Motor uses ultrasonic vibrations to quickly focus on subjects silently

Roof Prism

Sigma 14mm f/1.8 DG HSM Art Lens for Nikon F BOSE while the rounded nine-blade diaphragmSigma 14mm f 1. 8 DG HSM Art Lens for Nikon F F Mount Lens FX Format Aperture Range: f 1. 8 to f 16 Three FLD Elements, Four SLD Elements Four Aspherical Elements Super Multi Layer Coating Hyper Sonic AF Motor, Manual Override Rounded 9 Blade Diaphragm TSC Material, Brass Bayonet Mount Compatible with Sigma USB Dock The Sigma 14mm f 1. 8 DG HSM Art Lens for Nikon F is the world's first f1. 8 ultra wide angle full frame lens. The lens is completely