The Canon EOS lens to Nikon DSLR Camera Macro Helicoil is one of the Pro-Series lens mount adapter made with precision standard. As all Pro-Series adapters, these adapters have been specially crafted to endure professional lenses. There is no "play" between the lens and camera. With unique styling, the lens mount adapter maintains/enhances professional appearance. This Helicoid allows a Canon EOS lens to be used as macro lens with variable magnification ability.