The Nikon 600mm f/4 ED IF AIS is a super telephoto lens ideal for sports and wildlife photography or for capturing inaccessible events or places. The 600mm is often used by photojournalist when shooting in tough situations where getting close to the action is almost impossible. The internal focusing lens employ extra-low dispersion glass elements to ensure superior image quality and compensates for aberrations. The lens construction consist of eight elements in six groups with two ED glass elements. The lens has a relatively impressive 12x magnification and a bright f/4 max aperture to achieve higher shutter speeds.