Canon EF 16-35mm f2.8 L IS USM iii Lens

EF-Mount Lens/Full-Frame Format
Aperture Range: f/4 to f/22
Two Ultra-Low Dispersion Elements
Three Aspherical Elements
Super Spectra and Fluorine Coatings
Ring-Type Ultrasonic Motor AF System
Optical Image Stabilizer
Weather-Sealed Construction
Rounded 9-Blade Diaphragm