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I like the way the camera of the iPhone 3Gs lets you chose the image area to take light reading from. It allows for some interesting visual effects.
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I'm less crazy about the incredibly wide angle lens, though that's pretty much a feature with all point-and-shoots. It also can create interesting effects, especially if the warped horizon lines are your thing, but not very good for portraiture.
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It's also pretty grainy in low-light situations, but that is to be expected.
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I hope the next version will have an option for setting white balance.
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