The Canon EF 85mm f/1.8 USM went on sale 30 years ago, yet it still works perfectly including eye focus on the EOS R cameras
BRIAN SAYS… EOS R series cameras are bi-lingual, they work with the EF and RF lenses. This means that the lens adapter is just a physical converter of the connections.Camera capabilities like eye focus work well with older lenses, sometimes yielding better results than some DSLRs.