This is a Sigma 100-400mm lens which fits Canon EF mounts. Both front and rear caps are included. The glass on this lens is in excellent condition. All features are working exactly as they should (ie: image stabilization, autofocusing, etc), and have been tested. These lenses are fantastic, and I absolutely recommend it. You will not be disappointed with this lens. I offer a 30 day no questions asked return policy. I will ship your lens carefully packaged, and very quickly - usually same day.