Photographers can use the Canon EF 400 mm telephoto UD ultra-clear lens for total sharpness in each photo. Both a manual focus and an auto-focus help photographers get the focus they want, from artistic blurs to vivid clarity. The focus is easily adjusted with a smooth turning diaphragm in manual mode. The Canon EF 400 mm is made in a lightweight design weighing only 44 oz for easy travel and long hours of use. This telephoto camera lens is compatible with Canon EF design cameras. This Canon camera lens also features a 400 mm length for super close-up telephoto photography. A f/5.6 aperture is ideal for general photography in many different light settings. As a fixed focal length lens with a built-in hood to reduce flare, the Canon EF 400 mm lens helps photographers shoot outside at long ranges in both bright or dimly lit environments. With a two-element design, this Canon camera lens can produce sharp clear images. The telephoto camera lens is multi-coated to reduce glare, aberration, and discoloration.