Canon EF 17-40mm F4.0 L USM Lens

The EF17-40mm F4L USM is a lightweight ultra wide angle Canon EF zoom lens. It is especially well suited for use with digital EOS SLR cameras with a focal length conversion factor higher than 1. Superb optical performance throughout the zoom ran Fastest AF speed within its class Highly dust and moisture resistant 28cm minimum focusing distance at all focal length EF Mount L-Series Lens Aperture Range: F4-22 Three Aspherical Elements, One Super UD Ultrasonic Autofocus Motor Manual Focus Override... More