Sigma 400mm F5.6 APO
Launched September 1988

Sigma 400mm F5.6 APO for Canon EOS 620, 650 and all MF mounts

To minimize the colour aberration, which is the inherent problem of ultra telephoto lens, this lens is using 2 ultra low dispersion glasses in the front lens group. To have high speed AF mode and avoid heavy load to the AF motor, it incorporates inner focusing system. In addition, with a floating lens element system, it will produce high contrast and sharp image in entire focusing range from infinity to closest distance of 4 meters. It is a lightweight, compact, ease to use, high performance ultra APO telephoto lens.