Three - Layer Sandwich From Voightländer
This device has three layers.
The front layer is Leica M-series mount.
The middle layer is Voigtländer.
The back layer is Sony E-series mount.
But then I noticed a small red tab on the side of the adapter - once triggered, it allows the ring to screw open to provide the effect of a small extension tube. VERY useful for the Leica lens user who dos not want to haul boxes of gear to capture flowers and insects.
Well-made in Japan.