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Canon EOS 1D X Digital Camera Review$6,800.00
The Canon 1D X offers an ISO range that extends from 100-51200 natively, but can be expanded to 50-204800 if the user needs. In order to keep noise down at those higher ISOs, shooters can use the camera's built-in high ISO noise reduction, which is available at the low, standard, or high settings. More on how we test noise.
While the noise reduction is certainly effective at opening up some of the higher ISO speeds for JPEG shooters, it's not overly aggressive for most of the settings or most of the ISO range. We found detail loss was negligible with noise reduction at the low setting, and it barely affected detail at the medium noise reduction setting. The high ISO noise reduction was very aggressive, kicking in right at ISO 100.
The Canon 1D X offers immediate ISO control via the top plate of the camera, letting users set ISO anywhere from 50-204800. The standard range is just 100-51200, but that can be expanded in the menu to the full range. The low ISO of 50 doesn't effect exposure settings, but it does preserve highlight detail better than ISO 100 in very bright situations where parts of the scene would otherwise become saturated and blown out.