Canon EF 16–35mm f/2.8L III USM is a professional ultra-wide zoom with constant f/2.8 aperture, compatible with full-frame and APS-C Canon EF cameras, performing best on full frame. Its 16–35mm range is ideal for landscapes, architecture, interiors, and environmental portraits. A rounded 9-blade diaphragm provides smooth, even bokeh. The optical design includes 16 elements in 11 groups, with advanced GMo aspherical elements and UD glass for high sharpness and low distortion. Subwavelength Structure Coating and Air Sphere Coating effectively suppress flare and ghosting. Ring-type USM and a powerful processor deliver faster autofocus, with full-time manual focus available. Included: Canon EF 16–35mm f/2.8L III USM lens, front and rear caps, hood, UV filter, pouch.