Optimised for use with digital SLRs, the 135-400mm f/4.5-5.6 DG lens is new from Sigma. Multi-layer coating is designed to reduce the effect of ghosting and flare, in addition to improving picture quality throughout the zoom range and producing pictures with optimal colour balance. Constructed from 13 elements in 11 groups, the lens contains one aspherical lens and three Special Low Dispersion (SLD) glass to help reduce the effect of chromatic aberration. With dimensions of 88.5x183.6mm, the compact lens includes a rear focus system for fast Auto Focus speed and performance stability. It also enables a circular polarising filter to be attached to the static front of the lens. The135-400mm f/4.5-5.6 DG lens will cost £479.99 and is supplied with a removable tripod cover. Find out more at www.sigma-imaging-uk.com.