Canon EF 35-350mm f/3.5-5.6L USM is a high-performance autofocus zoom lens with a compact size and an extraordinarily long zoom range. It's suitable for applications like sports and nature photography, where mobility and focal length flexibility are essential. The Ultrasonic Motor (USM) enables fast and quiet autofocusing, and the drag adjustment ring allows for smooth or tight zooming operation. It also features an infrared index for adjusting focus when using black-and-white infrared film.