Sigma 50-200mm f/4.0-5.6 DC IF SLD Optical Stabilized for Sony Digital SLR Cameras

Optical Stabilization: Sigma's own OS System.Sony & Pentax: Original Anti-Shake function for camera body and viewfinderInner Focusing System: Eliminates front lens rotation; suitable for use w/circular polarizing filtersCompact, Telephoto Zoom LensHigh Image Quality: SLD glass elements with inner focusing
Product DescriptionThis compact high-performance telephoto zoom lens incorporates Sigma’s own Optical Stabilizer function. The lens incorporates SLD (Special Low Dispersion) glass in the

Source: Digital Camera and Video Store...