I have tested the adapter only with a lens. The function seemed flawlessly (Maybe just the right flange grant), set the aperture on the lens has to be done. However, I've only after tens of times the cautious bucking and half an hour cold sweat on his forehead, whether I even still succeed again able to separate from the lens adapter. Whether only the in the picture above to be seen on the ring bayonet release button was not working properly, or it was the lens (Sigma Ultra-WW) - no idea. But a second attempt I did not dare guaranteed. I'd rather save a little and grab much deeper into their pockets.
However, kudos to Amazon: completely hassle return was possible.
