I’m afraid one simply cannot pass judgement on noise and detail on photos that have been downscaled (as opposed to cropped – which these are not) by a factor of over 10 to 1. The noise of the 10 pixels (use to generate the single recorded pixel) will be averaged out and reduced by a factor of 10 (although only about a third of these pixels are genuine, the rest are interpolated); hence the ISO 1600 photo is actually the equivalent of ISO500 - so it's not as good as you might think..
Even with the downscaling, what’s that horrid smudge on the left hand side of the photos?
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Noise and detail
I’m afraid one simply cannot pass judgement on noise and detail on photos that have been downscaled (as opposed to cropped – which these are not) by a factor of over 10 to 1. The noise of the 10 pixels (use to generate the single recorded pixel) will be averaged out and reduced by a factor of 10 (although only about a third of these pixels are genuine, the rest are interpolated); hence the ISO 1600 photo is actually the equivalent of ISO500 - so it's not as good as you might think..
Even with the downscaling, what’s that horrid smudge on the left hand side of the photos?