Sigma has announced two new lenses. The 500mm f/4.5 and 300-800mm f/5 are especially designed for digital photography. Each lens incorporates a hyper sonic motor for quick and silent operation and are compatible with a selection of Sigma Apo Tele Converters, The ultra-telephoto 500mm f/4.5 lens EX DG HSM is constructed from 12 elements in 9 groups and features a multi-layer coating. With a suggested retail price of £2999.99 it is compatible with Sigma, Nikon and Canon lens mounts and includes a 46mm filter holder. Two Extraordinary Low Dispersion glass (ELD) for rectifying chromatic aberrations feature on the 300-800mm f/5.6 EX DG HSM. Retailing at £4999.99 it is constructed from 18 elements in 16 groups and offers an angle of view of 8.1 – 3.1 degrees. Find out more at www.sigma-imaging-uk.com or by calling 01707 329999.