Originally posted by Kiwizinho
70% of earth is covered in water, but I guess 99% of photographers only photograph in air. I don't want some bulky, expensive waterproof housing to photograph invertebrates in my local creek. Birders and bug photographers are well catered for with long telephotos and macro lenses respectively, but photographers into aquatic natural history are pretty much neglected unless they're into scuba diving and big housings.
That's an interesting point, and very true. I've only ever had casual interest in underwater photography – arm's length is about as deep as my cameras go – but I've owned the Olympus 770SW, Panasonic TS3, and now the TG6. (In fact, because the cameras are basically immune to damage, I still have all of them.) The TG6 is, indeed, sadly, the best of the remaining bunch – Nikon had their 1-series ILC waterproof, Leica tried the XU, and they're all gone.
Squaring the circle on the subject at hand, I've actually considered the Sony RX0.2 as a possible alternative to the GR3 and the TG6. That's the little cube that reviewers mistake for an action camera, but its photography abilities are decent. It's waterproof to 10m without a case, has a 24mm lens that's a fixed f/4 aperture, a flip-up screen, and uses 15 of the 20Mpx that its 1" sensor comes with. (So yes, it's a 1" sensor camera like the RX10 and RX100, but no, it doesn't use the full sensor size, reducing some of the benefits.) You'll need to use a specially adapted narrow finger – or maybe a toothpick – to operate many of its buttons, its close-focus is terrible, and it has some other drawbacks, but it might actually be the best current combination of small size, waterproof durability, and image quality. And it even records video if you like that kind of thing.