An XA (extreme aspherical) element with superlative surface precision works with ED elements for extraordinary resolution that can capture breathtaking texture and detail. Keep exposure settings constant throughout the zoom range to maintain low-light capability or action-stopping shutter speeds with consistently spectacular image quality. Direct Drive SSM (DDSSM) minimizes spurious motion while refined algorithms enhance AF operation speed. Smooth and quiet for movies as well as stills. A focus mode switch, focus hold button, and zoom lock switch provide professional control for a wide range of shooting situations.