The kirk lp 5 quick release lens plate fits canons 70 200mm f4 80 200mm f28 400mm f56 300mm f4 mf 200mm f4 micro 300mm f28 mf 400mm f45 mf and 200mm f28 lenses nikons 200mm f2 300mm f45 400mm f35 200mm f4 micro and 600mm f56 lenses sigmas 400mm f56 lens and tokinas 300mm f4 300mm f28 400mm f56 and 80 200mm f28 lenses it provides a secure quick release capability with arca style release systems including kirk arca swiss acra tech and wimberley