The Tilta 4x4" Lightweight Matte Box easily mounts onto 15mm rods via its rod adapter. It features two 4x4" filter holders. The lightweight construction adds very little weight to your system, and the swing-away design moves the matte box out of the way during lens changes, without having to remove the matte box from the rods.
The back of the matte box features a 114mm opening for lenses, and it comes with 80 and 95mm diameter lens adapters, and a fabric donut (Nuns Knickers), for use with smaller diameter lenses. The lens adapters and fabric donut are used to prevent light from leaking from behind the lens and reflecting off filters and flaring your image. The matte box features a removable top flag (eyebrow) that attaches to a hinge so you can precisely set the flag at the edge of your frame to block light sources from flaring.