Yes the legacy pins are still there. Only the EOS R50 requires the adapter it lacks the original 5 pins for older flash units. There may be some incompatibilities with older Godox flashes on newer EOS R Series cameras.
-Demetrius
Bodies: EOS 5D Mark IV
Lenses: EF Holy Trinity, EF 85mm F/1.8 USM
Speedlites: 420EX, 470EX-AI, 550EX & 600EX II-RT
