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, f/2.8 aperture throughout the entire zoom range, fluorine coating, improved durability and is dust and water resistant. - High performance L-series ultra-wide-angle zoom lens with constant f/2.8 maximum aperture. - All-new optical design for significant improvements in outer and corner sharpness. - Subwavelength Coating (SWC) and Air Sphere Coating (ASC) help to significantly reduce flare and ghosting. - Highly resistant to dust and water intrusion, enabling shooting even in harsh conditions*. - Circular aperture (9 blades) helps deliver beautiful, soft backgrounds. - Inner focusing ring USM, a high-speed CPU and optimized AF algorithms for fast and accurate autofocusing. - Full-time manual focus allows manual focus adjustment while in AF Mode. - Fluorine coating on front and rear lens surfaces helps reduce smears and fingerprints. Kit Includes: - EF16-35mm f/2.8L III USM - LENS CAP E-82II - LENS DUST CAP E - LENS CASE LP1222 - LENS HOOD EW-88D - Instruction manual(6ML) - Warranty card(NA) *Full weather-resistance for front section of lens requires attaching optical Canon PROTECT filter **scheduled to be available late in October