The OConnor Reduction Ring (114-110mm) enables a lens with an outside front diameter of 110mm to fit into an OConnor Obox WM Matte Box equipped with a bellows ring (not included). This configuration prevents light from leaking from behind the matte box and flaring filters in front of your lens; this ring is not suitable for use as a clamp-on ring.
Snaps into your OConnor O-Box WM matte box outfitted with a bellows ring (not included)
Prevents light from behind the camera leaking between your lens and matte box and degrading your image