Aimed at pros and advanced enthusiast photographers, this fast lens combines a lightweight magnesium barrel with dust- and splash-proof protection and water- and oil-repellent coating to handle challenging shooting conditions. For fast moving action it combines Intelligent Optical Stabilization with an acceleration sensor, allowing the capture of subject movement without losing panning even when the camera is moved in any direction, regardless of the position of the lens. Ten low-dispersion glass elements insure high-resolution capture from centre to edge, and optimization of spherical aberration delivers a natural bokeh effect, making it a good choice for portraiture as well.