That clearly show that the 160-multiple ISO settings exhibit less noise than the 100-multiple ISO settings. I believe that much of the confusion comes from mis-analyzing tests such as these: However, that doesn't necessarily make them better. In fact the cameras' native ISO settings (that is, the settings that are derived from analog gain rather than digital exposure compensation) are the multiples of 100 (ISO 100, ISO 200, ISO 400, ISO 800, etc). There seems to be a common misconception out there, held by even some very well-regarded experts (, webisode 2, about 3 minutes in) that the cameras' "native ISO" or "true ISO" settings are the multiples of 160 (ISO 160, ISO, 320, ISO 640, etc), and that the rest of the ISO settings are produced digitally. If you've spent any time researching Canon's HD DSLR cameras, you've probably come across discussions of which of the cameras' ISO settings to use and which to avoid.
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