EF-Mount Lens/Full-Frame Format Aperture Range: f/2.8 to f/22. Three Aspherical and Two UD Elements SWC, Air Sphere, and Fluorine Coatings. Ring-Type Ultrasonic Motor AF System Weather-Sealed Construction. Rounded 9-Blade Diaphragm. BUNDLE INCLUDES: Canon EF 16-35mm f/2.8L III USM Lens Lens Case Filter Kit Cleaning Kit