Vocas 105mm to 80mm Step Down Ring for MB-2XXVocas 105mm to 80mm Step Down Ring for MB 2XX When using a matte box as clip on, step down rings can be necessary, with or without thread. This ring is required when using a MB 2xx matte box (with 105 mm front diameter) as a clip on on a lens with a front lens diameter of 80 mm. Technical Specifications Manufacturer Vocas Systems Diameter 105 mm Mounting options Clamp Clip on Yes Material Industrial plastic Color Black Weight (gr.) 37 EAN