Aiming to improve on the default design, the Leofoto NF-04 is a collar foot for Nikon AF-S NIKKOR 180-400mm f/4E TC1.4 FL ED VR, AF-S NIKKOR 400mm f/2.8E FL ED VR, AF-S NIKKOR 500mm f/4E FL ED VR, AF-S NIKKOR 600mm f/4E FL ED VR and Nikon AF-S NIKKOR 800mm f/5.6E FL ED VR. This is a meticulously engineered support replaces Nikon's original lens collar foot and provides a lower profile and a lower center of gravity for a better balance.Two safety stops are located on the bottom of the foot, which prevents accidental lens release when a quick release receiver clamp is partially open.