As this 100% crop shows, the baseline sensitivity of ISO 200 is free of noise
ISO 400 is also clear of noise, although at 100% you can see a slight softening
At ISO 800 there is the faintest hint of further softening, but overall the image holds up very well indeed
At ISO 1600 the image has become softer, but still holds together well overall
By ISO 3200 noise has become visible, although the image remains usable
By ISO 6400 noise has become visible, even at lower image sizes
By ISO 12,800 the image has become fairly noisy and soft, but is still usable at smaller sizes
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