When first coming across the Sigma 200-500mm f/2.8 APO EX DG, I immediately thought I was being pranked. The lens is the size of a canon! This ultra telephoto zoom lens packs a fast F2.8 aperture at 500mm and F5.6 at the 1000mm focal length. Its glass has SLD and three ELD glass elements providing perfect image quality at the largest aperture. If you have play money, and want to take pictures from miles away, the Sigma 200-500mm is for you — ya creeper!