The kirk lp 9 quick release lens plate fits nikons 500mm f4 g ed vr 400mm f28 g ed vr nikons 600mm f4 g ed vr 400mm f28 d afs series ii 500mm f4 d afs series ii and 600mm f4 d afs series ii lenses it provides a secure quick release capability with arca style release systems including kirk arca swiss acra tech and wimberley