Sigma Optical stabilized 50-200 zoom lens was £279.99 Now reduced! This telephoto zoom lens incorporates Sigma's original OS (Optical Stabiliser) function making hand-held telephoto photography a reality. SLD (Special Low Dispersion) glass elements and the inner focusing system provide high definition and the Super Multi-Layer Coating reduces flare and ghosting and provides high contrast images. This lens incorporates HSM (Hyper Sonic Motor), ensuring a quiet and high speed AF. Excellent optical performance - SLD (Special Low Dispersion) glass elements and the inner focusing system provide excellent correction for all type of aberrations. High image quality is assured throughout the entire zoom range. Telephoto zoom lens with a compact construction - The lens has a compact construction with an overall length of 102.2mm (4.0 inch) and a maximum diameter of 74.4mm (2.9 inch). It is ideal for many situations such as landscape and general photography. Technical Specifications - Lens Construction - 14 Elements in 10 Groups Angle of View (SD Format) - 27.9 - 7.1 degrees Number of Diaphragm Blades - 8 Blades Minimum Aperture - F22 Minimum Focusing Distance - 110cm Maximum Magnification - 1:4.5 Filter Size - 55mm Dimensions - Diameter 74.4mm X Length 202mm Weight - 420g