Contax RF (internal bayonet) -> NEX Adapters?
This may just be a case of me looking in the wrong places, but anyone know if there is an adapter available to go from Contax rangefinder lenses with the internal bayonet (the sort used on ≤50mm lenses) onto Sony E mount? I've seen a few on eBay from Russian sellers that appear to be hacks made from parts of of Kiev rangefinders, but that's about it.
1936 Zeiss Contax II
1939 Leica III to IIIa conversion
1946 Leica IIIc to IIIf conversion