I have attached a link and photo for stoker regarding the new Olympus 8 mm F/1.8 fisheye PRO
I may be dense, but I don't think I really understood that one. Is the 4.33" a 'dome' or a 'fisheye dome'? I believed it's the latter.
If you look at the Nauticam port chart and the ZEN Underwater as well you will see that some of the ports are listed as dome ports and others are listed as fisheye dome ports. There is a clear difference in the curvature of the glass/acrylic between the two. This is not to say that the 8 mm fisheye can't be used in a dome port and that a lens like the Olympus 12 mm F/2, a killer lens can't be used in a fisheye dome port but performance may vary with each.
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