Sigma releases 120-400mm f/4.5-5.6 for Sony and Pentax

Sigma’s original OS (Optical Stabiliser) system allows the use a shutter speeds approximately 4 stops slower than would otherwise be possible. The effect of lens based stabilisation is visible through the viewfinder so allows the photographer to easily check for accurate focus and ensure there is no subject movement.

Three SLD (Special Low Dispersion) glass elements provide excellent correction for chromatic aberration.  This lens is equipped with the rear focus system that minimises fluctuation of aberrations caused by focusing.  It provides optimum image quality throughout the entire zoom range.  The super multi-layer lens coating reduces flare and ghosting. High image quality is assured throughout the entire zoom range.

The minimum focusing distance of 150cm  throughout the entire zoom range 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 focus override.