Cavision 37 to 46mm Threaded Step-Up Ring

This Cavision 37-46mm Step-Up Ring enables the use of 46mm threaded filters on lenses with 37mm filter threads. The 6mm depth enables this ring to fill the gap between the lens and the back of select rod-mounted matte boxes, helping to keep reflections from hitting your lens. The step-up ring has a 49mm outside diameter for use with clip-on matte boxes. It features a lightweight aluminum alloy construction with a black anodized finish.