Solution
All EF and EF-S lenses can be used by attaching the optional Mount Adapter EF-EOS R. The camera cannot be used with EF-M lenses.
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RF lenses
EF lenses
EF-S lenses
Mount Adapter
Caution
For EF-S lenses, a 3:2 aspect ratio in the center is captured, magnified approx. 1.6x (APS-C size).