Lens plate for Nikon AF 400mm/f2.8. This lens has three 1/4"-20 sockets, so purchase one additional mounting screw (rail comes only with two screws); see link under Related Items at left.
If using a Really Right Stuff B91 flash bracket with this lens, you will need to add our FB-A600 Raised Dovetail Adapter. This adapter mounts to the MPR-192 rail and raises the mounting location of the flash bracket by 6/10" of an inch to allow flash bracket to fully clear the barrel of the lens. See link under Related Items at left.