Compact, lightweight fixed focal length lens ideal for everyday photos, and with a large f/1.8 Aperture, a perfect lens for low-light photography and creative background blur. 80Mm effective focal-length when attached to an aps-c camera, optimal for portraits and photos of fast moving subjects such as children and pets A stepping motor (gear-type STM) supports the movie servo AF function in providing smooth and quiet continuous AF during video recording, as well as when shooting photos Metal mount helps provide stability and ruggedness Circular aperture (7 blades) helps deliver beautiful, soft backgrounds