The EF 16–35mm f/2.8L III USM has a bright constant maximum aperture of f/2.8, which provides superb control over depth of field and the ability to maintain the same aperture throughout the zoom range. This is particularly helpful when shooting outdoors at dusk or in inclement weather, or indoors in dimly lit rooms. At f/2.8, the EF 16–35mm f/2.8L III USM offers a bright view when composing images using the camera’s viewfinder.
The EF 16–35mm f/2.8L III USM features a new optical design engineered to deliver images of remarkable clarity and depth – a magnificent complement to the large, high-resolution sensors in the SLRs favored by today’s advanced photographers. It employs two large-diameter double-surface GMo lenses plus a ground aspherical lens to help decrease distortion, curvature of field and astigmatism. Two UD lenses help to reduce chromatic aberration, leading to precise color rendition, accurate edge-to-edge detail plus excellent contrast throughout the lens’s zoom range. This means sharp landscapes, reduced distortion in the edges of the frame and an overall improvement in image quality no matter the subject.