Crops from a 2MP (1600x1200) resize. ISO 100,200,400,800,1600,3200.
As you can see there is significant detail lost to noise suppression in going from ISO 400 to 800. But the image is still looking quite respectable and smooth at ISO 800. At 1600+ the noise is very obvious, but look at the single white hair in front of Kitty's left eye. It's still easily discernable at ISO 3200. Nearly all the low contrast coffee table texture is gone though.
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