Our custom-made Nikon to Canon EOS adapter ring will allow you to use all existing Nikon lenses on all cameras with the Canon EOS lens mount. It also means you can now use our popular high-end Zeiss lenses (which have a Nikon lens mount) on the Canon 5Dmkll, while maintaining perfect infinity focus! Please note that as of Feb. 8th, the mounts have been modified slightly to ensure proper fitment on Zeiss lenses. We have identified a slight difference in Zeiss mounts varying from the Nikon ZF specification which is taken care of with these modified mounts. Also note that This mount does not allow for electronic aperture control. Therefore Nikon F mount lenses with electronic aperture will remain fully open Made out of long-lasting chrome-plated brass.