The Canon EF 16-35mm f/2.8L III USM is an impressive wide-angle zoom lens within the esteemed L-series lineup, integrating an advanced optical construction. The lens features a combination of aspherical and ultra-low dispersion elements to reduce various aberrations, resulting in sharp, clear images. Coatings such as Subwavelength Structure Coating (SWC) and Air Sphere Coating (ASC) are implemented to suppress lens flare and ghosting, heightening contrast and color fidelity. The ring-type Ultrasonic Motor delivers rapid and whisper-quiet autofocus capability, complemented by a full-time manual focus and internal focusing mechanism. Built to withstand challenging environments, the lens is sealed against water and dust, and fluorine coatings on the front and rear elements guard against soiling and smudges, preserving image quality.