I purchased the EOS R when it arrived out, trading in my 5D iv. I haven't regretted it. My EF glass functions seamlessly While using the adapter, and I hold the variable ND adapter which has been a recreation-changer (no additional screwing/unscrewing/stepper rings etcetera). Third-bash lenses like my Sigma 50mm https://eos-r31863.look4blog.com/56742487/the-smart-trick-of-canon-cameras-that-no-one-is-discussing