This lens is constructed of 23 elements in 19 groups (including 1 Fluorite and 5 UD elements) which help deliver the sharpness and reduced aberration which professional photographers rely upon from Canon. The IS II Optical Image Stabilizer provides up to 4 stops of correction at all focal lengths.

This lens has a minimum focusing distance of 3.9' (1.2 m) at all zoom settings so you can get the shot when shooting close to your subject even in smaller spaces. Like all Canon L-series lenses, this telephoto zoom is dust- and moisture-resistant and designed to keep on going even in the most challenging of environments.