This telephoto zoom lens incorporates Sigma's original OS (Optical Stabilizer) function. It offers the use of shutter speeds approximately 4 stops slower. Three SLD (Special Low Dispersion) glass elements provide excellent correction for chromatic aberration. This lens is equipped with the rear focus system that minimizes fluctuation of aberration caused by focusing. It provides optimum image quality throughout the entire zoom range.
The super multi-layer coating reduces flare and ghosting. High image quality is assured throughout the entire zoom range. The minimum focusing distance of 150cm (59.1") throughout the entire zoomrange and has a maximum magnification of 1:4.2 make it useful for close-up photography.
This lens incorporates HSM (Hyper Sonic Motor), which ensures a quiet and high-speed AF as well as full-time manual focusing capability. The addition of the optical 1.4x EXDG APO or 2x EX DG APO Tele Converters produce a 168-560mm F6.3-8 MF ultra-telephoto zoom lens or a 240-800mm F9-11 MF ultra-telephoto zoom lens respectively.
The Sigma 120-400mm is commonly used for Landscape/scenery, Sports/action, Wildlife, Wildlife photos and more.The Sigma 120-400mm is most used by customers who consider themselves to be a Photo enthusiast, Semi-pro photographer among others.The Sigma 120-400mm is popular because customers like the following qualities of the Sigma 120-400mm: Consistent output, Durable, Easily interchangeable, Fast / accurate auto-focus, Nice bokeh, Rugged, Strong construction to mention just a few.