The Carl Zeiss Vario Sonnar T 24-70mm f/2.8 Lens for Sony cameras is a high end performing large aperture zoom camera. Equipped with Super Sonic wave Motor (SSM), the Carl Zeiss Vario Sonnar T 24-70mm f/2.8 Lens is designed for fast and silent auto-focus. Super Sonic wave Motor (SSM) means that the lens has its own auto focus motors. For Sony DSLRs without in-built auto focus, this lens is a must. The Carl Zeiss Vario Sonnar T 24-70mm f/2.8 Lens is ideal for a wide range of shooting situations. The lens has in-built Super Steady Shot image stabilization. This results in shake free & undistorted images in low light. With Super Steady Shot image stabilization, hand shakes will have no effect on the pictures.