Superb optical performance is assured by the all-glass 10 group / 12 element lens configuration includes 3 aspherical lenses and 1 ED lens. The reduced weight of the focusing lens combined with a high-precision stepping motor ensure high-speed autofocusing. So those once-in-a-lifetime shots won't escape your camera. Also optical image stabilization effectively minimizes blur when shooting dark scenes or zooming in on the action. When shooting movies, the lens keeps moving subjects in crisp focus, while image stablization keeps blur to a minimum even when shooting scenes while walking.