Samyangs 14mm t31 ed as if umc ii prime is a wide angle manual focus cine lens specially designed for video work on sonys full frame a7 models 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 pre