Sigma 30mm f/1.4 DC DN Contemporary Lens for Sony E - 302965Short Description A fast, versatile prime, this 30mm f 1. 4 DC DN Contemporary Lens from Sigma is designed for APS C format Sony E mount mirrorless cameras, where it provides a 45mm equivalent focal length. The bright f 1. 4 maximum aperture benefits working in low light conditions and also affords extensive control over focus placement for using selective focus techniques. In regard to the optical design, one aspherical element and one double sided