Sigma 20mm f/1.4 DG HSM Art Lens for Canon EF 7PC Accessory Kit. Includes Manufacturer Accessories + Lens Pen + Dust Blower + Cap Keeper + Lens Pouch + Microfiber Cleaning Cloth EF Mount Lens/Full-Frame Format; Aperture Range: f/1.4 to f/16 Two FLD Elements and Five SLD Elements; Two Aspherical Elements Super Multi-Layer Coating; Hyper Sonic AF Motor, Manual Override Rounded 9-Blade Diaphragm; TSC Material, Brass Bayonet Mount Built-In Petal-Shaped Lens Hood; Compatible with Sigma USB Dock