I am currently using an Olympus TG-4 adventure camera. It still has the small 1/2.3 sensor but has a faster f2.0 -4.9 lens. The telescoping function, to 4x, occurs inside the housing so I can keep it on the dash or in my pocket. I have taken nice underwater video with it, but it still likes plenty of light. In video mode it's focusing ability in low light conditions is very poor. My quest goes on.