The EF 24-70mm f/2.8L II USM is a Canon L-series zoom. Ranging from wide-angle to portrait length, this lens is also distinguished by its constant f/2.8 maximum aperture. One Super UD element and two UD elements reduce color fringing and chromatic aberrations in order to realize a high degree of color accuracy and clarity. Three aspherical elements are also featured, and minimize distortion and spherical aberrations for improved sharpness. Super Spectra coating controls flare and ghosting for high contrast and neutral color fidelity. This 24-70mm f/2.8 lens also sports a ring-type USM and internal focusing mechanism to enable quick, quiet, and accurate autofocus performance, as well as full-time manual focus override. Additionally, this lens is weather-sealed and has a protective fluorine coating on the exposed elements for use in trying environmental conditions.