I took this in a pool a few weeks ago:
Sony A7, Nauticam NA-A7, Nauticam 180 viewfinder, Nikonos 15mm
Apparent distance 1 foot (measured), f/11, 160 second, Manual Mode, Auto ISO @ 200
Focused with Focus Peaking.
I was looking for corner sharpness with rectilinear lens, avoiding use of a large dome.
(I had a little trouble getting the target flat due to spacing of the suction cups vs grout lines. The grout in the corners may be the best indicator of sharpness.
I can't post a JPEG larger than 1000kb)
I was looking for a relatively lightweight, rectilinear wide angle travel rig.
The orange discolouration is sunlight filtered through forest fire smoke, filtered through pool water:(
Looking for opinions, suggestions, comments and discussion:)