The Canon EF 35-80mm f/4-5.6 III Autofocus USM Ultrasonic Zoom Lens is a telephoto lens designed for Canon EF mount cameras. With a maximum aperture of f/5.6, this lens allows for a smooth and quiet autofocus through its Ultrasonic Motor (USM) technology. The lens is lightweight at 175g and offers both auto and manual focus options, providing flexibility for photographers to achieve their desired results. Its focal length range of 35-80mm makes it suitable for a variety of photography styles and situations.