Hello fellow Dutchman (I was born in Den Haag ). My post was actually a gentle nudge for Nauticam to consider. I think they could do it if they are able to get their hands on the Caldwell design optics that is inside the metabones adapter. Since Nauticam already has developed a working adapter to work for the Sony NEX 5 housing to fit the Nikonos mount, it would not be much of a stretch to think that it be able to fit the optics inside the Nauticam NEX-Nikonos adapter. I have shot the 12mm Sea&Sea and loved it. Just imagine to be able to have this lens full frame and it be faster at f2.8 as well.