The tokina 11 16mm t3 atx cinema lens with micro four thirds mount is an ultra wide angle zoom lens with a constant t30 aperture optimised for video use on a 35mm movie cameras with a pl positive lock lens mount the lens features a de clicked aperture ring for smooth iris pulls an easy to read distance scale and offers manual focus control the zoom aperture and focus rings all have standard 08 pitch gears for use with follow focus systems