Features:
Designed for Full-Frame DSLR, compatible with all APS-C Sensor DSLRs
Aperture Range: f/2.8 to f/32
One Fluorite Element & Five UD Elements
Air Sphere Coating
Ring-Type Ultrasonic Motor AF System
Optical Image Stabilizer
Internal Focus, Focus Range Limiter
Weather-Sealed Design, Fluorine Coating
Detachable, Rotatable Tripod Collar
Rounded 8-Blade Diaphragm
CANON EF11-24L EF 11-24mm f/4L USM, Diameter 108mm with Built In Lens hood 



