Sigma 50mm f/1.4 EX DG HSM Auto Focus Lens Kit for Nikon AF Cameras, with Tiffen 77mm UV Filter, Lens Cap Leash, Professional Lens Cleaning Kit Large Aperature, standard prime lens, has superior peripheral brightness and corrects the sagittal coma fare Standard lens with large maximum aperture of F1.4. Creates sharp images with high contrast and ensures superior peripheral brightness Incorporates molded glass aspherical lens, perfectly correcting coma aberration and creating superior image quality. Super multi-layer lens coating reduces fare and ghosting.