I’m thinking of getting a Nauticam 9” N120 glass dome for my S&S D850 housing. Does any have good success with this setup? If so, which adapter do you recommend? There is a replacement NAM0142 port adapter and the 20mm extension #21520, that seems to be able to do the trick.
The lens I shot WA is Sigma 15 and Nikon 16-35. While, I have no issues getting the recommend 80mm extension for S&S on the Nikon 16-35mm, the 0 extension for the Sigma is the differentiator. I rather use the #21520 and not mess with changing out the port adapter that is attached to the 9” dome. What would the 20mm additional extension do to the images from the Sigma?