The stellar combination of superlative optics, astonishing performance & brilliant construction, the EF 400mm f/2.8L IS II USM super telephoto is the professional's choice for a long lens, & perfect for nature & wildlife photography. Over 28% lighter than its predecessor & now the lightest lens in its class, the EF 400mm f/2.8L IS II USM features Fluorite optics that deliver sharper images with less chromatic aberration, a completely redesigned Image Stabilization system that offers up to four extra stops of performance, a newly-developed Fluorine coating that keeps soiling, smears & fingerprints to a minimum, plus new construction in line with only the best that Canon has to offer. With a third Image Stabilization mode (Mode 3) that activates IS only when the shutter button is fully pressed, & giving the equivalent effect of a shutter speed four stops faster, the EF 400mm f/2.8L IS II USM allows for easy panning & is ideally positioned for professional action photography. With a new security slot for wire-type security locks, buttons & switches are redesigned for intuitive, deliberate operation, & dust & water sealing keeps the lens functioning flawlessly in even the most challenging environments.