Apparently the new Zen DP170-N85-II is a glass version of Nauticam's 7" acrylic dome. What I liked most about the original 2 part DP-170/S&S-Mini-port adapter set-up is it's ability to accommodate wider lens (physical diameter, not AOV) such as the Z12 or even the upcoming Sony FE 90 macro, since one can use S&S extensions and macro ports.
Zeiss contacted me today and said my modified Z12mm is back from Germany and will be here by weeks end. I'm anxious to see how it works in my 4.33. I also have a 20mm extension, so I may see if I can put a diopter on it somehow for CFWA in the 4.33 or 7". This might help with the corner sharpness problem often encountered with rectilinear WA's in a high curvature compact domes. As it is, the Z12 has a rather short minimum focusing distance of 7", so it will be interesting to see how it functions with corner sharpness in a compact dome. What I don't know is how a low power +2 diopter affects AOV when used with a WA rectilinear? Can anyone explain that to me.
I'm not all that hopeful to be honest that the 4.33 will work, but no one has really tried it. So, I'll give it a whirl before putting my 4.33 and Sony lens combinations (S16, WA and FE converters) up for sale. It's comforting to know, however, that a step up to a 7" port will work if the 4.33 doesn't fit the bill. Plus, I'll use the same method (as my 4.33) to modify my Port 72 swing mount to fit the 7" wings and have a nice versatile single dive scouting lens with WA and macro capability (w/ Aquatica +10) when using the Z16-70. Good to hear the Z16-70 IQ looks good and sharp underwater.
Should I get the compact 4.33 to work with the Z12, I plan to add my 20mm extension to the 4.33 to use the S18-55 for a single dive lens (it's length fits perfectly, but I haven't tried it out yet to see if it actually functions). I have a pretty good S18-55 copy and am fairly happy with the results in my flat Port 72. I'm hoping the dome will reduce the chromatic distortion, along with a wider AOV. This all is a cost effective approach to my limited budget. In time, I see myself with the new N/S&S mini-port adapter, a DP-170 and S&S macro port using the Z12, Z16-70 and Sony FE 90-M lenses on my NEX7. Like you said, it'll only be a little larger rig to transport than my current 4.33 set-up. Maybe even around the same size when I get rid of my Nauticam C-60 macro port, Metabones adapter and Canon 60 EF-S macro.
I guess I'll find out how this all pans out within a week in my hot tub or nearby pool. LOL. It'll be late spring or maybe even fall before I return to the Philippines with my Filipina wife to dive.