Here are compared the Canon 5D Mark III to its 5D Mark II predecessor at ISO 50 through ISO 25600, whole ISO values.
Noise and color
This scene has a strongly warm color balance, and therefore offers a good counterpoint to the green-dominant prior comparisons.
Often, the lab evaluation of digital noise fails to take into account the real world, where there can be strongly-hued light and/or rich dark saturated tones, both of which can make noise far more prominent. Studio tests with perfect white balance are a crazy way to test for noise; anyone with studio lighting will certainly use strobes to enable ISO 100 for top quality (barring oddball shooting scenarios). Lighting cannot be controlled for many types of photography (think about a stadium or an event or interior where both tripods and flash are forbidden, etc).
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