I looked closely at the Canon G9 as a "compact" to use alongside my Canon DSLRs (1Ds III and 5D), and rejected it as neither a true pocketable compact (it's too big and heavy for that) nor a high quality DSLR-substitute. To me it falls between the two camps. I bought instead a slightly-larger-than-minute compact from another manufacturer, which gives better results on land than I have ever had from any Canon or Sony compact. And it was way cheaper.
But there's no u/w housing available for it, and I want to upgrade from my present three u/w compacts (I rent them out) which all date from 5mp days. Hence my initial interest in the G9. I have now pretty well decided on another Canon, but this time a true compact. That's the SD950IS. A guest here had one a few weeks ago in the Canon housing and took some superb u/w photographs with it, as good as any I've ever seen taken with a compact. He used the internal flash at a range of subject distances and I couldn't see any shadows or vignetting.
And when not underwater it makes a tiny but high-performing pocket camera, very light yet durable thanks to its titanium case. I really can't fault it.
Sure, it doesn't have many manual controls, but I don't want that in a sub-compact. I want to be able to take good shots automatically as quickly as possible. It does have the important controls of being able to freeze exposure/focus and then reframe, and to bias the automatic exposure up or down by several stops. And it has a built-in very effective "underwater" mode. That's all I look for in a compact. If I want to fiddle or take more difficult shots I'll use a DSLR.
A camera can't do everything. To me the SD950IS is the perfect pocket camera for surface use, and the perfect compact camera for underwater use. Sorry to disagree with other people who've posted here.
I like having manual and Av mode but auto is good and here is a link to exactly what makes your choice a better choice than the square port variety. Good luck, looks like a nice set up.
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