Zeiss Contax 21mm f/2.8 Distagon cinemodded EF-Mount, declicked iris, 0.8 gears for iris and focus, 80mm front with 77mm thread, fullframe coverage, 730 gr A wider lens with the unique vintage look of a mid 90ies Zeiss lens. When using with a fullframe sensor the frontring may vignette very slightly. If the front ring is not needed to mount a mattebox it can be unscrewed for full coverage.