The Sigma 300mm f/2.8 EX DG Autofocus Telephoto Lens for Sony Alpha & Minolta Maxxum Series is a high performance telephoto lens and, for the professional photographer, is an absolute requirement. With a fast telephoto lens suitable for capturing the fastest action, whether that is a local soccer game, high school basketball in a dimly lit gym or sports cars racing. This lens also does double duty isolating single faces at a news conference or catching the bride in a candid moment at the wedding reception. Two ELD (Extraordinary Low Dispersion) glass elements provide optimum color correction and sharpness throughout the entire zoom range and a new multi-layer lens coating technology and lens design formula reduce flare & ghosting. When used with full frame cameras & Sigma's 1.4x or 2x optional Tele Converters it becomes a 420mm F4 manual focus lens or a 600mm F5.6 manual focus lens respectively. For the professional or advanced amateur looking for such a lens at a value price there is no other choice than the Sigma 300mm F2.8. Equipped with all of the latest technology to compete with the camera manufacturer's products and produces tack sharp end result images.Features: Designed for use with full frame digital SLR cameras. May also be used with smaller APS-c size sensors with a corresponding effective increase in focal length to about 450 with most camerasHSM (Hyper-Sonic Motor) ensures a quiet & high-speed auto focusAmazingly compact. Under 9 inches long & just over 5poundsInner focusing system which enables responsive and fast auto focus speed & overall length does not changeA lens hood, tripod socket TS-21, front & rear lens caps and carrying case are included with the lens.