Sigma
200-500mm f/2.8 APO EX DG for EOS
Professional super-telephoto zoom lens
Along with an incredible zoom range, this lens also delivers a constant f/2.8 aperture all the way to 500mm, a feat unprecedented at this focal length. Image quality is superb, thanks to the use of Extraordinary Low Dispersion and Special Low Dispersion elements for the correction of aberrations. Focusing is quick and decisive, while zooming is done with an internal motor. It also comes with a decicated hard case and a 2× teleconverter, which will turn it into a 400-1000mm f/5.6 lens.This lens will be most at home photographing sports or wildlife, where its long telephoto range and fast aperture are most useful. Please note, however, that due to its size, a sturdy tripod is absolutely essential when using this lens.