The AP-554 replaces the stock foot on the Nikon 500 f/4 AF-S versions I, II, and VR, as well as the Nikon 200-400 f/4 AF-S VR. It is an alternative to The AP-553 plate. It has the advantage of greater clearance between the body of the lens and the foot, making it easier to use the foot as a handle for your lens. In addition, it is longer, allowing you to balance your lens properly when using light-weight camera bodies. It will allow you to balance your lens with all pro and prosumer Nikon camera bodies, even when using teleconverters.