With an advanced Optical Stabilization system, the Sigma 150 mm-500 mm camera lens provides exceptional pictures in any lighting condition. The HSM (Hyper-Sonic Motor) of this Sigma telephoto-zoom lens offers quiet and quick operation. This telephoto-zoom Sigma camera lens has three SLD (Special Low Dispersion) glass elements that offer enhanced color reproduction and minimum aberration. With 9 diaphragm blades, the Sigma 150 mm-500 mm improves the background effects. The 86.6-inch minimum focus distance of this Sigma telephoto-zoom lens gives you close and detailed picture. The 21 elements in 15 groups lens construction of this Sigma camera lens offers sharper and refined images with amazing contrast.