The Sigma 800mm f/5.6 EX DG APO HSM is an apochromatic
extreme-telephoto lens with a fast f/5.6 maximum aperture. The
ultra-quiet Hyper Sonic Motor (H.S.M.) and Internal Focusing features
assist autofocus speed and handling.
The improved DG lens
design corrects for various aberrations. This lens is specially coated
to get the best color balance whilst cutting down on ghosting caused by
reflections from the digital image sensor.
This lens is ideal for capturing wildlife and sports photography.