The world's first1 17-70mm F/2.8, large aperture standard zoom lens for APS-C mirrorless cameras. Even with VC and a focal length expanding to 70mm, this lens has outstanding optical performance compared to its competitors. The optical construction of the new 17-70mm F/2.8 Di III-A VC RXD features 16 elements in 12 groups. Two GM (Glass Moulded Aspherical) lens elements and one hybrid aspherical lens element are precisely arranged to maintain high-resolution performance from edge to edge. In-camera lens correction (shading, chromatic aberration, distortion) are available too.