The Sigma 16mm F1.4 DC DN (C) is a wide-angle lens specially designed for mirrorless cameras. It provides an equivalent focal length of approximately 24mm on APS-C. Together with the F1.4 large aperture, it becomes a practical and high-quality wide-angle lens. In terms of optics, the lens adopts a 16-element design in 13 groups, including 3 FLDs, 2 SLDs and 2 aspherical lenses. The materials are quite sufficient and help improve the image quality at full aperture. In addition, the lens supports autofocus, which is practical higher