Samyangs 24mm t15 ed as if umc ii video lens is a wide angle manual focus prime designed for video work on sonys full frame and aps c compact system cameras it has been carefully engineered for professional film and video work with the focus gear ring allowing the use of follow focus systems the decoupled de clicked aperture ring works quietly and smoothly during shooting the stated t number of 15 refers to the actual light transmission of the lens and is particularly important in the