The Canon EF 16-35mm F/2.8 III USM is a wide-angle lens that's suitable for full frame single-lens reflex cameras by Canon. This lens is optimized for the image sensor of the Canon 5D Mark IV. The maximum aperture opening of F/2.8 is available over the entire zoom range. Thanks to the 2 aspherical lens elements, your photos are taken without lens errors, and they will be sharp from corner to corner. The lens is provided with 2 special coatings. These ensure that flare and contrasts that are too high, while photographing in the bright sun, are reduced to a minimum. The optical design consists of 16 elements, divided over 11 groups. The casing of the lens is sealed against splash water and dust.