Sigma recently introduced the 500mm F4 DG OS HSM Sport. The new flagship super telephoto lens features the latest in Sigma technology. Designed for professional outdoor and wildlife photographers, the lens is rugged and durable without sacrificing function. It is constructed magnesium alloy components and includes a carbon fiber hood. The front element is water and oil resistant, which makes it possible to shoot in the rain or near water spray without worrying about damaging the lens. As with other sports lenses, the 500mm F4 DG OS HSM Sport also features a dust and splash proof construction. For even more…