The EF 28mm f/1.8 USM Lens from Canon is a wide-angle prime lens with a fast maximum aperture of f/1.8 enabling effective low-light imaging and shallow depth of field focus. An aspherical lens element reduces aberrations and improves image sharpness at the frame edges. The ultrasonic focus motor (USM) provides fast and quiet autofocus action, which is especially important when shooting video. Manual focus via the rubber focus ring is smooth and accurate.