This Canon 100-400mm IS L USM Ultrasonic Zoom Lens is a high-quality telephoto lens that is perfect for Canon EF mount digital cameras. It has a maximum aperture of f/4.5 and a focal length of 100-400mm. The lens is compatible with Canon cameras and features auto and manual focus. It also has image stabilization and is designed with a 77mm compatible filter size. This lens is in great shape and is a great investment for anyone looking for a high-quality zoom lens for their Canon camera.