EF to EF-R adapters
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EF to EF-R adapters

On the other hand, converting EF lenses to the EF-R mount is easy, courtesy of no less than three adapters, all of which do basically the same thing. The most basic is a simple mount converter, with an additional two adapters which add an extra control ring, and a tray for drop-in filters, respectively (the latter is pictured above). These adapters allow EF and EF-S lenses to be used on the EOS R without limitation.

Sadly, because of its relatively (for a mirrorless camera) deep flange-back, the RF mount will not be capable of accepting as many adapted third-party lenses as the super wide, super shallow Nikon Z mount. Neither Sony E nor Nikon Z-mount lenses will ever be an option for use on the EOS R or later cameras, for example.