Canon 2971C002 EF-EOS R Lens Mount AdapterUnleash Your EF EF S Lenses on EOS R System Discover seamless integration with the Canon Mount Adapter EF EOS R. This adapter maintains full compatibility between Canon EF and EF S lenses and the EOS R mirrorless digital camera system. Designed with a matching exterior to complement EF lenses, it ensures peak optical performance and reliability. Standard Mount Adapter enables EF EF S lens compatibility with EOS RP, EOS R, EOS R6, and EOS R5 Cameras