Samyangs 14mm t31 ed as if umc ii vdslr is a wide angle manual focus cine lens designed for use on dslr cameras with full frame and smaller sensors it has been carefully designed for professional film and video work with the focus gear ring allowing the use of follow focus systems the decoupled aperture changes quietly and smoothly via another gear ring the t number of 31 refers to the actual light transmission while distance scales are marked on both sides of the lens to allow easy and