Rokinon 8mm T3.1 UMC Cine Fisheye II Lens for Canon EF-M Mount Compact System Cameras (CV8MBK31-M Fixed 8mm focal Length with de-clicked T3.1 Aperture Follow focus compatible gears on focus and Aperture rings Same crystal clear optics and construction as the Rokinon 8mm F2.8 Fisheye lenses 11 elements in 8 groups, built specifically for mirror less cameras Minimum focus distance 1 foot.