im getting ready to house my 5D3 with a Nauticam housing. i have the canon 8-15mm and plan on buying a 16-35. most likely the f4 version. Is there a reason you would purchase the f2.8 over the f4 besides the larger aperature? Also whish dome port would give me the sharpest image, ZEN 9 inch glass or the Sea and Sea 10 inch acrylic? is there another port that yall would suggest?
thanks in advance