FEATURES- EF 85mm f/1.8 USM Lens Sharp. Lightweight. Responsive. These are just a few adjectives that describe this terrific portrait-length telephoto lens. With a powerful ring-type USM and fast f/1.8 aperture, subjects zip into focus in the viewfinder. It is great for all types of work calling for moderate telephoto power, but comes into its own low-light situations, and offers a 1/3-stop speed advantage over the 100mm f/2 USB lens. * Ultrasonic Motor In order to achieve critical autofocus, the elements within a camera lens have to move quickly, quietly and precisely. With this in mind, Canon developed the world's first lens-based Ultrasonic Motor (USM), which spins the lens motor with ultrasonic oscillation energy. Instead of a large, noisy drive-train system, electronic vibrations create by piezoelectric ceramic elements power the mechanical action of the lens, providing constant torque, with virtually instantaneous stops and starts. USM lenses are both faster and quieter than conventional motor driven autofocus systems, and draw minimal power from the camera, draining very little battery power.
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