I have done extensive testing with my 1100D and 600D, and find that
results closely align with the results in the link provided by Alex.
My 1100D is clearly happy at 1600 followed by 3200.
My 600D is best at 800 followed by 1600.
In both cases the ISO below their respective sweetspots was inferior.
I also found that the noise situation definitely improved with wider
aperture. The difference between f/4 and f/2 was immediately apparent.
raymo
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