Vocas 114 mm to 100 mm Step down ring for MB-215 / MB-255 / MB-216 and MB-256 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 114 mm front diameter) as a clip-on on a lens with a front lens diameter of 100 mm.
