Samyang 16mm t22 ed as umc cs ii vdslr is a wide angle bright cine lens with geared manual focus and aperture control rings optimised for video the aperture ring is also stepless for smooth iris pulls and depth of field markings on the side of the lens provide an essential assistance to focus pullers this lens has a maximum aperture of t22 which refers to the actual light transmission of the lens and is particularly important in the film industry where light readings are normally made man