Canon EF 16-35 mm f2.8L III USM
High-performance L-series ultra-wide zoom lens with constant f/2.8 maximum aperture
All-new optical design for significant improved in outer and corner sharpness
Subwavelength Coating (ASC) help to significally reduce flare and ghosting
Highly reistance to dust and water instrusion,enabling shooting even in harsh conditions
Circular aperture (9 blades) helps deliver beautiful,soft backgrounds
Inner focusing,ring USM,high-speed CPU and optimized AF algorithms for fast and accurate autofocusing