XPimage Locking Adapter for Pentax 67 P67 Lens to for EF 1D 5D Mark 5DS R 750D
5D/ 5D Mark II/ 5D Mark III/ 5DS/ 5DS R/ 6D/ 7D/ 7D Mark II. Canon 1D/ 1D Mark II/ 1D Mark III/ 1D Mark IV/ 1Ds/ 1Ds Mark II/ 1Ds Mark III/ 1DX. It's a locking version adapter. which will make the connect of lens / adapter very firmly.