Matte box

In photography and videography, a matte box is a device attached to the end of a lens in order to prevent light leakage.

It performs and mounts essentially the same as a lens hood, but usually includes adjustable fins called French flags.

Another purpose of a matte box is to hold filters in place in front of the lens.

If both, the bellows is positioned within the rigid sunshade, having a mask which may be adjusted forward or backward to suit the angle of view of the camera system.

In cases of Steadicam or electronic gimbal shots that require lighter-weight rigging and accessories, cinematographers may opt for a clamp-on matte box that directly snaps onto the front of the lens.