Connect your EOS R system to the wider world with EF and EF-S lenses. EOS R adapters ensure full compatibility with Canon EF and EF-S lenses to allow Canon EOS R camera owners who own other EOS cameras to fully integrate with existing lenses. The standard Mount Adapter EF-EOS R allows reliable use of EF-S and EF lenses on EOS R cameras. Photographers who already own several EF-S or EF lenses can safely invest in EOS R and they will be able to make full use of these optics.