The Sigma 150-600mm f5-6.3 Contemporary DG OS HSM lens is a lightweight, compact telephoto lens designed for wildlife, sports, and travel photography. It features a Hyper Sonic Motor for fast AF, intelligent OS with 2 modes, and 1 FLD & 3 SLD glass elements for minimized chromatic aberration. Weighing 1930g, it includes a 95mm filter size, a detachable tripod socket, and water/oil-repellent coating.