The third generation of famous Canon EF 16-35mm F/2.8L USM, the new EF 16-35mm f/2.8L III USM Ultra-Wide Zoom Lens features a large diameter GMO dual surface aspherical lens and ground aspherical lens. With the constant f/2.8 aperture throughout the entire zoom range provides better low light performance. Improved durability and is dust and water resistant with the fluorine coating.
The Canon EF 16-35mm F/2.8L III USM is special designed for full-frame camera to capture wide angle photos however it can be used with APS-C camera with equivalent focal of 25.6-56mm. Distortions and aberrations are remarkably small with ultra-low dispersion glass and three high-precision aspherical lens elements. A ring-type Ultrasonic motor (USM) provides quiet, fast, precision auto focusing and predictive tracking. Maximum aperture of F/2.8 with 9 circular diaphragm blades produces brilliant bokeh (blury in out-of-focus areas).
The included petal lens hood helps minimizing the unwated flare when using under the sun or other light sources.