For what it's worth, Ikelite's weekly newsletter has a write-up from a Nikon D850 user who recently moved to a Nikon Z8. The writer is enthusiastic about the Z8. His article might be worth a look if one is considering making a move from a D850 to a Z8. It's available on the Ikelite Underwater Systems website.
-Tinman
I had a couple of issues where the autofocus on my Nikon 60mm Micro quit working during dives. My autofocus issues resolved both times immediately by simply switching the camera off and turning it back on. I'm not sure why the lens did that.
-Tinman
Thought I'd better shift to this new forum before Wetpixel goes completely belly-up. I started diving in 1989 as a public safety diver in a small Colorado mountain community. Wildlife photography has been a passion since I was in junior high school. We re-located to southern Arizona fourteen years ago following our first retirement to get within easy range of the ocean to seriously pursue underwater photography. The Gulf of California is close and wonderful. Thanks to those who've worked on getting this opportunity organized!
-Tinman