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At ISO 100 the Fuji X-S1produces sharp, noise-free images

ISO 200 is almost identical to ISO 100

At ISO 400 some slight softening has begin to

creep in, but you’ll need to go looking for it at 100% or more

By ISO 800 image softening is more visible, with increased noise in shadow areas

By ISO 1600 shadow detail has really begun to break down, though the image remains useable at smaller sizes

Noise and a softening of detail is easily visible at ISO 3200, even at smaller image sizes

Because ISO 6400 requires you to shoot at 6MP, the overall image size is smaller. Quality isn’t great either

ISO 12800 requires you to shoot at 3MP and the results are fairly terrible