Canon Mount Adapter EF-EOS RCanon Mount Adapter EF EOS R Canon SKU: 2971C002 Helix SKU: CA2971C002 Overview The Mount Adapter EF EOS R gives you the ability to utilize any Canon EF or EF S lens with the EOS R camera, letting you use your existing lenses with the camera and allowing you to expand your horizons. Lightweight, compact and easy to attach, the Mount Adapter EF EOS R makes it possible to use EF and EF S lenses without compromising functionality, speed or quality. With