Amedeo adapter is perfect, a gem.
You an also find on eBay Russian crafty guys who hack lens mount from a Russian Contax copy onto a Sony bayonet and sell for $50. Not precise, and mine would let you unscrew the helical completely, but does the basic job.
Col. Sebastian Moran
, ret. (not really)
In Classifieds Now: Bessa R2S, Contax IIa
and Nikon lenses
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Named "Best heavy-game shooter in the Eastern Empire." Clubs: Anglo-Indian, Tankerville, and Bagatelle Card Club.
Sony E/FE, Nikon dSLR, and iPhone digital. Misc film.
Birds, portraits, events, family. Mindfulness, reflection, creativity, and stance.