Vocas 105 mm to M77 Threaded step down ring low for MB-2XX

When using a matte box as clip-on, step down rings can be necessary, with or without thread. This low ring is required when using a MB-2XX matte box (with 105 mm front diameter) as a clip-on on a lens with internal M77 thread. The shape of the ring is low for compatibility with Sony PMW-EX1 cameras.