50mm on full-frame cameras, 80mm effective focal-length on APS-C cameras, it's an excellent prime lens for portraits, action, and nighttime photography Maximum aperture of f/1.8 offers exceptional low light performance Circular 7-blade design captures gorgeous, sharp images and movies with beautiful bokeh Updated lens arrangement with improved lens coatings delivers images with excellent color balance, plus minimized ghosting and flare Stepping motor (gear-type STM) delivers near silent, continuous Movie Servo AF for movies, plus speedy, smooth autofocusing for stills Improved focus ring placement makes manual focus adjustments easy Features a rugged metal mount, plus an improved minimum focusing distance of 0.35m (1.15ft) and a maximum magnification of 0.21x Compact and lightweight, it's an outstanding walk-around lens