The Sigma 200-500mm f/2.8 EX DG APO IF Lens is a massive ultra-telephoto zoom lens that offers an impressive fast f/2.8 aperture throughout its entire zoom range, all the way up to 500mm. Combined with the included dedicated high-quality 2x teleconverter, this lens can be converted for use as a 400-1000mm f/5.6 lens. Now combine this with an APS-C sized digital SLR camera, and you're looking at approximately a 300-750mm f/2.8, or a 600-1500mm f/5.6 (with 2x teleconverter) lens. This lens covers the widely used 200 to 500mm focal length range, and maintains its fast f/2.8 aperture over its entire zoom range. SLD (Special Low Dispersion) glass and three ELD (Extraordinary Low Dispersion) glass elements provide excellent correction for all type of aberrations, and assure a high level of optical performance throughout its entire zoom range. Shooting distance and focal length are displayed on the lens' LCD panel, which is almost a necessity with a lens of this size. In addition, a dedicated BP-21 Li-ion battery is used to power-assist the zooming and AF operation. This battery is built into the lens barrel. SLD element and three ELD glass elements provide high image quality from the maximum large apertureGreen rubberized protective barrel, ideal for outdoor useConnects directly to a tripod head. The camera can be rotated by unlocking the rear lens barrel and rotating it with the camera attached. The lens has multiple tripod sockets, both 1/4"-20 and 3/8" sizes.A 72mm filter, including a rotating polarizer, can be inserted into the drop-in filter holder at the rear of the
