Canon EF 11-24mm f/4L USM Lens
EF Mount L-Series Lens/Full-Frame FormatConstant f/4 Maximum ApertureSuper UD, UD, and 4 Aspherical ElementsSWC, Air Sphere, and Fluorine CoatingsRing-Type USM Autofocus MotorInternal Focus; Full-Time Manual FocusWeather-Resistant DesignRounded 9-Blade Diaphragm