OK; yes I presume you are shooting the 85DX Macro. These are nice.
I have the 85 1.4 G, not a macro lens, so would not shoot this close. The 1.4G would only be a fish portrait type of lens.
Thanks
The 85mm Micro-Nikkor is probably the best Nikon 85mm lens for UW use. Too bad they did not introduce this back when the D2X was new.
There are many 85mm Nikkors. I have three of them and they are all manual focus - a very old 85/1.8 (1960's vintage), an 85/2 AI, and an 85PC.
There are three 85/1.4 Nikkors that I know of, one manual focus and two auto focus models. I think the new 85/1.8 G lens would be better than the 85/1.4 G unless you absolutely needed the 1.4 aperture and demonstrated that it worked well. You will have to decide how you were going to shoot it - You will need a diopter with a dome - with a flat port you will have to content with the RI of H2O.
The subject in the attached photo is under water though I was not. I was a passenger in a Cessna 206 on floats. Taken in the early 80's with an 85/2 on Kodachrome 64. Those are sockeye salmon lined up in ranks. This is the Newhalen River not far from where the Pebble Mine is planned.
