Set of Masks for Universal Matte Box

This set consists of 5 masks. Each mask mounts on the front of the matte box and covers one of five focal length ranges. The mask is essentially a solid light blocking part with a window corresponding to the field of view of the lens. Matte-finish on the camera side prevents internal reflections. On the outer side it is ultra-matte coated to minimize reflections on the mask itself. This blocks almost all unwanted stray-light from entering the matte box.