At ISO 100 images are sharp, detailed and free of noise.
At ISO 200 images are still pleasingly noise free .
At ISO 400, noise reduction begins to soften detail.
ISO 800 is the point at which noise becomes more visible – even at lower image sizes.
ISO 1600 is soft across the whole image, with quite intrusive levels of noise.
ISO 3200 is best avoided altogether if possible.
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