Leica M + Mamiya 645/Phase One lens
COMPATIBLE MF MA SB
The flange focal depth should allow conversion, but...
There's a way to mend the lack of simple mechanical adapters, first get a Canon EF -> Leica M adapter, then snap it on a M645 -> Canon EF adapter, allowing you to mount the lens (however, you'll have to mind the crop factor and loss in brightness).
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