T-mount to Canon EF-mount adapter T2 universal thread mount Use T-mount lenses on your Canon EOS cameras. Metal build, heavy duty! The T-mount is a standard lens mount for cameras and other optical assemblies. The usual T-mount is a screw mount using a male 42×0.75 (42 mm diameter, 0.75 mm thread pitch) metric thread on the lens with a flange focal distance of 55 mm and a mating female 42mm thread on a camera adapter or other optical component. #YearStartsHere