Canon EF 17-40mm f4.0

The Canon EF17-40mm USM is an ultra wide zoom lens designed for professional and high amateur SLR EOS users. It is especially well suited for digital SLR cameras with an imaging sensor size smaller than the 35mm format. On such cameras these focal lengths can give an angle of view approximately equivalent to that of a 28-70mm lens used on a 35mm camera, which makes it the ideal standard zoom lens...