Canon EF body + Micro 4/3 lens
Unfortunately the flange focal depth doesn't allow conversion.
Unfortunately 4/3 lenses are unable to cover Canon's APS-C sensor, let alone a fullframe one, even if the flange focal depth would have been sufficient.
You can buy only macro adapters with limited focus range:
If you'd like to learn more about flange focal length and what does this have to do with incompatibility, this article might give you some insight.
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