The Sigma DL 100-300mm f/4.5-6.7 AF Lens is a telephoto zoom lens compatible with Canon EOS cameras. It has a maximum aperture of f/4.5-6.7 and a focal length range of 100-300mm. The lens is part of the Canon DL series and features autofocus capabilities. It is designed for use in photography and is a great addition to any photographer's collection.