A large-aperture telephoto zoom that combines outstanding imagery with beautiful bokeh. Its reliable performance ensures fast moving subjects are kept in sharp focus when shooting sports, wildlife, or the great outdoors. Large constant aperture F2.8 high performance telephoto lens covering a useful range of frequently used focal lengths from 70mm midrange telephoto to 200mm telephoto Quiet focus operation with built-in SSM (Super Sonic Wave Motor) for high speed, responsive lens adjustment Sony Nano AR Coating minimizes flare & ghosting for exceptional clarity & presence Internal focusing for high speed AF Dust & moisture resistant design 3 focus hold buttons & electronic slider focus range selector switch