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). Features Canon high performance macro. Life size image reproduction (1.1) UD lens element Focus distance limiter 8 blade circular aperture for beautiful creative blur effects 58 mm. filter size Ring type USM AF motor Optional triPod collar A perfect portrait lens of the highest quality with additional macro capability. Macro with extended reach. The EF 100 mm. 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. Ring USM auto focus with manual override. Canons ring USM auto focus system employs ultrasonic frequency vibrations for fast accurate & virtually silent operation. Full-time manual focus override via a large ring that does not rotate during auto focus allows photographers to fine-tune focusing instantly. Super Spectra coating. Super Spectra coatings help ensure accurate colour balance & high contrast & suppress flare & ghosting by absorbing light that might be reflected off internal lens elements & image sensor. Features. Zoom Type Fixed Lens.