A few more thoughts........
Using an LCD on any camera is also dependent on your housing back. Some have the LCD shaded pretty well while other housings don't. This will affect how bright the LCD appears for framing easily.
Surprisingly many lower budget like the Fantasea housings (yes, I'm a dealer and user) come with a really nice rubber pop on BLACK shade. It's wider at the TOP than the bottom and really is great to frame with, in my case the Canon G7X II's compact camera.
Most SLR housings don't have a decent shade. That said, as in my previous post I've successfully used the LCD for shooting a Ikelite Canon SL1 and previous full sized SLR housings with the LCD.
As to swimming and positioning the housing to frame with a LCD here's some thoughts to ponder.
There was a book in my dive book library I loaned to someone and was never returned
Titled
"Wake of the Whale" it chronicled National Geographic photographer Bill Curtsinger diving with yet to become famous UW photographers Chris Newbert off Hawaii and Chuck Nicklin in Patagonia.
This was before Chris Newbert blew up the UW imaging world with his incredible coffee table book "Within a Rainbowed Sea". You can check out details about both these books on Amazon.
Folks, this was also the days of FILM having only 36 chances to capture underwater pictures before having to open your housing and reload film
The chapters describing being offshore all day in a small 17' Boston Whaler with Chris Newbert free diving with whales or whatever else appeared had some insights I recall to this day......
The author of the book, Kenneth Brower (son of famous naturalist and environmentalist David Brower) describes tasking Curtsinger how he gets his photos in a 3 dimensional environment like the ocean, especially over deep bottomless blue of Hawaii.
Curtsinger says something like his: "I don't know, the housing is like ball I hold steady composing my shots."
He states he swims "around" his housing being a gimbal like cinematographers use to position a camera framing shots.
Curtsinger, Newbert and Nicklen were shooting all ambient light, no strobes as swimming for hours per day.
To this day I delight in rotating
around my housing getting into position to frame what I hope will be a nice capture
At 67 I'm not as flexible as years gone by but this old dog is still in the hunt !!! LOL....
Get out there and enjoy yourself. It's definitely worth it
David Haas
Haas Photography Inc.