Canon EF 16-35mm f/2.8L III USM features a ring-type USM motor and high-performance CPU, which work to ensure faster focusing.
Newly designed optics delivers stunning sharpness right across the frame. A re-designed 5 group zoom mechanism that improves vibration and shock resistant levels.
Subwavelength and Air Sphere coating, help to prevent ghosting and flare from effecting your images.
9 bladed aperture
In comparison to the EF 16-35mm f/2.8L II USM 7 bladed circular aperture, the EF 16-35mm f/2.8L III USM contains 9 bladed circular aperture diaphragm, that allows you to create beautifully soft background focus.