The Sigma EX 70-200 mm f/2.8 Telephoto Zoom Lens features a large constant maximum aperture of f2.8 through the zoom range, and is optimized for digital SLR cameras. This large aperture telephoto zoom lens has a minimum focusing distance of 39.4 inches throughout the entire zoom range, making it very convenient for close-up photography. It maintains a greater working distance, which enables you to capture small animals and insects, without disturbing them. This lens uses two Extraordinary Low Dispersion glass elements and two Special Low Dispersion elements, for utmost correction against chromatic aberrations. High image quality is assured throughout the entire zoom range. This lens incorporates an inner focusing system, which eliminates front lens rotation, allowing the use of a Petal-type Hood. Since focusing and zooming do not change its overall length, this lens is easy to hold and use.