Zeiss Contax 60mm f/2.8 Macro Planar cinemodded EF-Mount, declicked iris, 0.8 gears for iris and focus, 80mm front with 77mm thread, fullframe coverage, 800 gr This is a outstanding macro lens. Up to a magnification ratio of 1:1 the size of a 1 Eurocent coin can be shown more than fullframe. Because of the long extension of the barrel, the use of a wider gear for your mechanical or remote focus is recommended.