Replace your lens foot with the Markins RN-60 Ring Plate for Nikon AF-S 400mm f/2.8G ED VR and AF-S 600mm f/4G ED VR Lenses to gain support at two points on the lens and to minimize vibrations or shake while this ring plate is mounted to a head. The Arca-type lens plate mounts to the tripod collar on the lens, and the lens collar towards the front of the plate encloses around the front barrel of the lens to provide additional support. At the same time, the front lens collar allows you to rotate the lens just like the rear lens collar. The Duralumin Ring Plate is hard anodized, which gives it a scratch-resistant surface.