The EF 100mmm f/2.8 Macro USM lens is equally at home for portraits as it is for macro photography up to life-size (1.0x). The EF 100mm F/2.8 Macro USM is a medium telephoto lens with a macro feature providing a 1.0x magnification. With eight aperture blades, creative background blur is possible to help make the subject stand out. The lens features a focusing limiter switch which limits the focus range to improve AF speed.