Sigma 200-500mm f2.8 Apo EX DG

This lens SIGMA 200-500mm f2.8 Apo EX DG is the first ultra telephoto zoom lens
with F2.8 aperture in the 500mm focal length. By mounting the unique adapter, the lens becomes a 400-1000mm F5.6m ultra telephoto zoom lens with autofocus. This allows the photographer new fields of expression in all types of photography, such as sports, portrait or
nature photography. The ELD (Extraordinary Low Dispersion) and SLD (Special Low Dispersion) elements provide excellent correction for all types of aberrations providing image quality superior throughout the entire zoom range.