Leica M body + Contax G lens
COMPATIBLE IN THEORY
The flange focal depth should leave enough space for conversion, but why are there no suitable adapters is a different question.
The flange focal depth of the Contax G is 29mm, while the Leica M has 27.8 mm, which would leave some space for the adapter. The reason is likely that the 1.2mm gap is too few to slide the two locks together.
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