Sigma 14mm F1.4 DG DN ArtNew vision. Expanding possibilities. The world's first and only* lens that combines an ultra wide angle of 14mm with a maximum aperture of F1. 4. All for the best starscape photography. The stars in the sky are a source of inspiration for viewers. On the other hand, the starry sky is a very demanding subject for a wide angle lens, with its numerous tiny point light sources spread over the entire image. The 14mm F1. 4 DG DN Art is the worlds widest F1.