Here are compared the Canon 5D Mark III to its 5D Mark II predecessor at ISO 50 through ISO 25600, whole ISO values.
For this comparison, I reduced my normal sharpening amount from 60 to 40 so as not to accentuate noise too much. As a practical matter, digital images must be sharpened and it makes a better evaluation to process images as similarly to real-world usage as possible, but perhaps not to the full amount of sharpening when very high ISO values are involved. Noise reduction was of course turned off.
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