Sigma 50mm f/1.4 DG HSM Art Lens for Nikon F Bundle Includes Manufacturer Accessories + 3PC Filter Kit + Lens Cap + Lens Pen + Cap Keeper + Microfiber Cleaning Cloth Aperture Range: f/1.4-16 One Molded Glass Aspherical Element; Three Special Low Dispersion Elements Super Multi-Layer Coating; Floating System & Large Diameter Design Hyper Sonic AF Motor; Rounded Nine-Blade Diaphragm Brass Bayonet Mount; Compatible with Sigma USB Dock