Canon EF 16-35mm F4L IS USM

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