This Bundle Includes Sigma 14mm f/1.8 DG HSM Art Lens for Canon EF, With Cleaning Kit, Cap Keeper, Lens pouch. Wide-Angle Performance: 14mm focal length with a bright f/1.8 aperture, perfect for low-light and wide-field photography like astrophotography.. Advanced Optical Design: Three FLD elements, four SLD elements, and four aspherical elements reduce chromatic aberrations, distortion, and spherical aberrations for sharp, clear images.. Smooth Autofocus: The integrated Hyper Sonic Motor (HSM) provides fast, quiet autofocus and full-time manual focus override for precise control.. Durable Construction: Built with a Thermally Stable Composite material and a brass bayonet mount, ensuring durability and performance in varying environmental conditions.