Sony SAL70200G 70-200mm f/2.8 SSM Lens  for Sony Alpha Digital SLR Camera
A precision zoom lens with bright aperture and fast, quiet auto-focus response. Specially designed for the APS-size CCD imager of the Sony Alpha DSLR-A100 camera, this superb G-Series zoom lens covers a broad range of frequent telephoto shooting situations.   Its 35mm-equivalent range of 105-300mm zooming, fast f/2.8 aperture and quiet, high-speed SSM (Super Sonic wave Motor) auto-focus precision makes it ideal for long-distance sports and wildlife photography.Lens FeaturesSSM (Super Sonic wave Motor)A built-in lens motor for faster automatic focusing with high torque at low speed, quick start/stop response, and quiet, smooth operation.ED (Extra-low Dispersion) glassFour precision ED Glass lenses correct chromatic aberrations and deliver visually accurate results even at full telephoto zoom extension.Internal focusing systemInternal lens elements move, so the overall length does not change -- creating a zoom lens that focuses more quickly and doesn’t affect the balance of your camera.2 DMF (Direct Manual Focus) modesAllow you to quickly revert to manual focus by just turning the manual focus ring of the lens.Versatile focus holdThree focus hold buttons in different lens locations, plus electronic slider focus range selector switch.