Sigma 24mm f/1.4 DG HSM Art Lens for Canon EF Bundle Includes Manufacturer Accessories + 3PC Filter Kit + Lens Cleaning Pen + Cap Keeper + Microfiber Cleaning Cloth F Mount Lens/FX Format; Aperture Range: f/1.4 to f/16 FLD and Special Low Dispersion Elements; Two Aspherical Glass Elements Super Multi-Layer Coating; Hyper Sonic AF Motor Full-Time Manual Focus Override; Rounded 9-Blade Diaphragm Thermally Stable Composite Material; Compatible with Sigma USB Dock