Sigma has announced the 24-70mm F2.8 DG DN Art series lens for Sony E and the Panasonic – Leica – Sigma L-mounts. The 24-70mm F2.8 joins the previously-announced 14-24mm F2.8 DG DN Art as the second of Sigma’s DN, or ‘Digital Native’ zooms designed specifically for full-frame mirrorless. Key features include: Best-in-class optical performance. The F2.8…