The Canon 16-35mm f/2.8L mark III (3) features a new optical design with modern coatings. This improves outer and corner sharpness with minimal distortion. A member of Canon’s legendary L series the full-frame 16-35mm delivers outstanding image quality and a professional-grade durability. It also offers a fast and constant f/2.8 maximum aperture for consistent performance throughout the zoom range.
With new aspherical elements the 16-35mm mark 3 minimises distortion throughout the zoom range. Along with those elements the lens utilises Ultra-low Dispersion glass elements to minimise chromatic aberrations.
In terms of handling, the 16-35mm uses a ring-type USM focusing motor combined with a high-speed CPU and optimised algorithms for lightning fast and accurate autofocus. The lens has an internal focus design and offers full-time manual focus override so users can make tweaks using the physical focusing ring regardless of mode. Along with all of this, the aperture diaphragm uses nine rounded blades to create smooth bokeh.
For professional use, the lens is dust- and water-resistant, using seals throughout to prevent intrusion of particles, especially when shooting in inclement weather. Additionally, it uses a fluorine coating on the exposed front and rear elements to reduce smears and make cleaning easier.