found at DigiDirect
The Sigma 70-200mm f/2.8 DG DN OS Sports Lens for Sony E-Mount is a large-aperture zoom lens for full-frame mirrorless cameras. In addition to the expressive imaging capabilities owing to the latest optical design, the lens offers a high level of performance and features that meet the expectations of professionals in both still and video, including high-speed autofocus with HLA (High-response Linear Actuator), optical stabilizer with the latest algorithm OS2, and the superior weather resistance of Sigma's Sports line.
Combined with the 14-24mm F2.8 DG DN Art and the 24-70mm f/2.8 DG DN Art, these three zoom lenses for full-frame mirrorless cameras with a bright f/2.8 constant aperture cover a wide range of focal lengths.