I’ve used the EOS R with native RF lenses and EF lenses. The EF lenses operate just like they are on my 5D4, with no decrease in performance or speed. The adapters are great. The RF lenses is where Canon is investing their time to produce better lenses than the EF equivalents. I’ve used the Canon RF 28mm-70mm f/2 and the RF 50mm f/1.2. Both are great glass. Unfortunately they are huge too.
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