DSB and any other underwater shooters.........
Your price estimates to buy an aluminum housing for a Canon R5 /R5 II are way low in today's world.......Even depending where you are in the world prices have increased significantly in the small underwater imaging world.
That was one reason I mentioned a great AF performing camera like the Canon R50......Look at the specs and the AF tracking performance is darn near high end models.
A friend did buy a Seafrogs housing for his Canon R50 which is unbelievably cheap but it works......He had a problem with the pop up flash not fully extending....When we were in Cozumel the built in flash lightning bolt icon would disappear past 5M / 15' depth.....
To Seafrogs credit they sent him a new front housing and he's used it successfully on several trips.
If I didn't house the dirt cheap Canon R100 for my needs I'd buy a Seagrogs housing for my Canon R50. I'd check tariffs buying from Hong Kong and delivery into the US though.
I'm not wild about the Seafrog's housing's DOME port connection but they do have a silly simple
"test once vacuum system" ensuring your housing is sealed. But then you then release the vacuum, remove the little electronic test module and plug it and dive.
The housing has DUAL back o-rings and for my friend has been fine.
There's one more problem if you choose the budget Seafrog's housing......
Being a light but tough polycarbonate they are
extremely buoyant and I mean EXTREMELY floaty !!!! You'll need a nice metal dual handle tray and maybe attach a 2-3# or more weight underneath it to get it below the surface comfortably........Even with strobe arms and strobes or video lights it'll be a floater
If you're a snorkeler or surface shooter this might not be a problem. In fact I believe the Grand prize winner of one of the recent underwater photography contests shot a high end camera in a Seafrogs housing !
Your mileage may vary so choose accordingly.......
David Haas