INCREDIBLY SHARP: XA (extreme aspherical) and three ED (extra-low-Dispersion) glass elements for superb resolution, clarity and contrast BEAUTIFULLY SMOOTH BACKGROUNDS: Circular 11-blade aperture for beautiful bokeh defocus effects CAPTURE ALL THE DETAIL: Sony Nano AR Coating to eliminate flare and ghosting FAST AND PRECISE: A powerful RDSSM (Ring Drive Super Sonic wave Motor) actuator provides the speed and precision required for both stills and video shooting PROFESSIONAL ERGONOMICS: A sealed dust and moisture resistant design provides extra protection to ensure reliable operation in challenging environments