The full ISO test scene
As this 100% crop shows ISO 160 is sharp and noise-free
At ISO 200 the image is still crisp and noise-free
At ISO 400 the first signs of noise have begun to creep in, although images remain perfectly usable
At ISO 800 images are notably softer when viewed at 100%, although again remain perfectly usable at smaller image sizes
By ISO 1600 noise has become much more noticeable at larger image sizes
The top ISO setting of 3200 produces noisy, soft images
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