This fabulous adapter can enable the camera owners to increase the cameras magnification and working distance. Features: The K&F Concept C/Y-EOS Lens adapter allows you to plyour favorite Contax Yashica C/Y Lens on your Canon EOS camera body. This adapter gives you the ability to use your irreplaceable prime lens and saves you the cost of purchasing new lenses. The adapters are precision made to insure the perfect fit. High quality and compact. Made of brass and aluminum (not plastic). There are no electrical contacts in the adapter ring,exposure and focus has to be adjusted manually. Smooth surffor effortless mount, fine made to be light weight and strong. Made of brass and aluminum (not plastic), with precise design and high technology. Please note: Infinity focus positionthe position of the infinity mark of the telephoto lens or super telephoto lens is shifted slightly to the positive side to enable focus adjustment even when focus shift is caused due to temperature changes.The shift range is denoted by an L-shaped line, Be sure to check the focus through the viewfinder even when you shoot at infinity.