Sigma 500mm f/4 DG OS HSM Lens, first prime telephoto lens in sigma’s acclaimed Sports line. Ideal for capturing distant fast moving subjects. Rugged Design, dust and splash proof eases working on Harsh weather conditions outdoors. An advanced Optical Stabilizer(OS) with two mode switch, 1 for handheld, 2 for vertical and horizontal tracking and panning. Furthermore, the Hyper Sonic Motor (HSM) (1.3x the torque of previous models) enable fast and snappy focusing. While the state-of-the-art electromagnetic diaphragm provides exceptional performance for high-speed shooting. Additionally, Sigma 500mm uses Rear filters if required. USB Lens Dock and Sigma Optimization Pro customizes lens as such personalized focus limiters, 4 zone micro focus tuning, OS preview behaviour, AF performance enhancement.