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Canon PowerShot G15 Digital Camera Review$499.99
Typically, designing an exceptionally bright zoom lens involves some image quality tradeoffs. One might expect to see excessive purple fringing or excessive distortion as a result of trying to cram a lens this fast into a body as small as the G15's. But as it turns out, that's simply not the case: The G15 displays far less chromatic aberration than most of its competitors. It's all but invisible in our samples below, regardless of aperture or focal length, and our experience shooting in the real world backs up our observations in the lab.
Similarly, geometric distortions are amazingly well-controlled. The lens shows mild (-0.37%) barrel distortion at full wide angle. Barrel distortion is still in evidence at middle focal lengths (-0.30% at 13.8mm) before flipping over to moderate pincushion (0.66%) at full telephoto. We're not sure whether there's correction being done in-camera by software in this case, but if there is we can see no evidence of it, and that's good enough for us.