The Nikon 600mm f/4 G ED IF AF-S SWM VR is a super telephoto lens ideal for action, sports, and wildlife photography. Engineered to deliver seriously excellent optical performace the lens incorparates three ED (Extra Low Dispersion) glass elements into the formula. The maximum aperture of f/4 provides very shallow depth of field and the lens produces very pleasant bokeh. It also features Nikon's VR (Vibration Reduction) which helps reduce lens/camera shake to maintain sharpness. An AF-S SWM (Silent Wave Motor) provides fast and quiet focus with full time manual focus override. It's professional level lens for when you want maximum magnification without compromising on image quality.