No EF-M compatibility
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No EF-M compatibility

The lack of EF-M cross-compatibility is a bit surprising. It forecloses the possibility of anyone using EF-M lenses on a hypothetical future APS-C format EF-R camera, essentially closing off the much vaunted APS-C to full-frame 'upgrade path' for Canon's mirrorless customers.

Canon's long-term interest in APS-C mirrorless has always looked a little shaky - could the EOS-M line be left to quietly die, in the same way as Nikon's 1 system? We hope not. More likely in the short term (but still a bit odd, however you look at it) is that Canon will pitch its EF-M cameras as a solution for those photographers that want the convenience and size advantages of APS-C, with RF as a full-frame mirrorless system running (kinda, sorta,) in parallel.

If nothing else, the simultaneous announcement of a 32mm F1.4 for the EOS M-series is an indication that Canon wants us (you) to know that it's still taking EF-M somewhat seriously.