Aussie Diver
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Specifications for the new Canon G10 housing #6146.10 can be found here: External threaded lenses cannot be used to any advantage with the G10 camera. [url=http://www.ikelite.com/]IKELITE Underwater Systems
For that reason alone, I'd say the G9/Ikelite setup is better than the G10. Could see this happening though. The 28mm lens (I'm guessing) is causing too much vignetting? Plus, I don't know of any wet WA lenses that work on a 28mm lens (and have a 67mm thread).
I had the G7 for a few years, was a great camera with the WA lens. If I didn't have that option, I wouldn't have been too happy with it though.
Will be interesting to see if Ike can come up with a solution though.