Lens Canon EF 17-40mm f/4L USM

EF Mount L-Series Lens

Aperture Range: f/4-22

Three Aspherical Elements, One Super UD

Ultrasonic Autofocus Motor

Manual Focus Override

Water and Dust Resistant

Internal Zooming and Focusing

Truly Circular Diaphragm

77mm Front Filter Diameter

Rear Holder for Three Gel Filters