The standard lens for many professional sports and nature photographers. The
latest image-stabilised version of the 400mm f/2.8L is the best yet, with
better handling, lighter weight and the world's incredibly fastest AF speed among 400mm
f/2.8 lenses. Durability and weather resistance are world class. A complete
redesign of optics has resulted in canon's best image quality ever in a 400mm
lens.