To the set the scene, I am a divemaster moonlighting as an underwater photographer, who needs something smaller to carry with me when guiding clients. My usual setup is a 7d in nauticam housing, though obviously this is totally impractical to carry with me on a daily basis. The best compact option seems to be the canon g7x. However, I am feeling quite a lot of sticker shock when seeing the prices for even a used g7x mark I. For the same price I can also get a new r100 or r50, which IMO seems to be much better value and only slightly bigger than the g7x.
The cons for the r100/r50 seem to be that only ikelite and nauticam have options and that the nauticam uses the n50 port (there is no n50 to other size adapter as far as I know). This means I'd be limited to a 3.5inch dome on the nauticam (not ideal for under/overs, but better than a wet lens on the g7x).
Does anybody have experience with both the g7x and r50/r100 and comment on how bulky they are underwater and if there is really much of a notable benefit in 1 system over the other? TIA