To return to the original question. Its not only the camera and its high ISO performance, but also the lense. For Olympus 4/3 users, the new Olympus f1.8 8mm FE might be a solution for low light conditions. Like Jack suggested. At least when making wide angle shots is your purpose. With a small colourful object near the front of your dome, you cant get around the strobes with a focus light when vis is limited. With natural light it is a different story, Then you definitely need some sun rays to light up the larger objects at a greater distance, like a wreck.
- JackConnick likes this