The ARRI LMB-4A is a 6.6"x6.6" lightweight matte box. The ARRI LMB-4A is designed for extreme wide angle lenses and can only be used by clipping on the lens directly. It will fit lens diameters of a range from 80mm – 130mm these include Zeiss and Cooke lenses. The ARRI LMB-4A has a wide shade that also fits the ARRI/Zeiss Ultra Prime 8R.