Canon 16-35mm F2.8

The EF 16-35mm f/2.8L II USM incorporates three aspherical elements to ensure corner-to-corner sharpness and clarity throughout the focal range. Two UD (Ultra Low Dispersion) elements virtually eliminate chromatic aberrations. A fast f/2.8 maximum aperture stays constant over the full focal-length range, meaning no variation in shutter speed will occur when zooming.