A friend of mine who runs a live aboard dive boat on the Great Barrier Reef out of Cairns, has asked me to rent my gear to him for this years far northern charters where he runs a trip from Cairns to Thursday Island and return. I own a Nikon D810 in a Nauticam housing with Inon strobes, 16-35mm wide angle lens plus a 105mm macro as well as other gear.
I don't think he has any knowledge of this system nor of housed DSLRs in general so I wouldn't think his uw photography would be of a very high standard,
I know that he usually shoots with a compact camera and doesn't edit his images much if at all. If I were to consider this how much would be a fair price do you think?