Zeiss Contax 35mm f/1.4 Distagon cinemodded EF-Mount, declicked iris, 0.8 gears for iris and focus, 80mm front with 77mm thread, fullframe coverage, 840 gr This is the widest lens out of a set of three Zeiss Contax lenses known for the outstanding stop of f/1.4. Together with the 50mm f/1.4 and the 85mm f/1.4 ist a perfect triplett tool for breathtaking pictures with shallow depth of field and the unique vintage look of mid 90ies Zeiss lenses. This lens may not be used with a 0.71 speed booster or any other speed booster due to opto- mechanical reasons means danger to damage lens or speed booster.