Sony 24 -70mm f/2.8 Carl Zeiss Vario Sonnar T Zoom Lens for Sony Alpha Digital SLR Cameras Zoom range of 24-70mm for all-around versatility Brilliant large-aperture f2.8 design Carl Zeiss T* coating to minimize lens flare Fast, silent auto-focus -- SSM (Super Sonic wave Motor) Aspherical lens elements to reduce spherical distortion