rokinon Rokinon 12mm f2.0 NCS CS Ultra Wide Angle Lens Sony E-Mount (Black) Written by admin on December 6th, 2023. Its fast f/2.0 maximum aperture is further beneficial to working in low-light conditions. Rokinon 12mm f2.0 for Sony E-Mount. Rokinon 12mm f2.0 lens. It has been in the manufacture’s box on my closet shelf since then.