DxOMark's measured ISOs vs. manufacturer ISOs

Started Mar 13, 2013 | Discussions thread
Martin.au Forum Pro • Posts: 13,288
Re: DxOMark's measured ISOs vs. manufacturer ISOs

This really feels like some people have looked at the DXO ISO values and decided that they must be the only value of ISO that matters.

They've then taken that concept and are working backwards, to the claim that on a camera like the OM-D, the camera will need a shutter speed twice a "normal" camera, or an ISO twice that of a "normal" camera to achieve an equally exposed photo.

So, a "normal" camera would shoot 1/100, ISO200, f5, and the OM-D would need, 1/100 ISO 400, f5.

However, this is demonstrably false. Both cameras meter the same, and return a photo at about the same exposure level.

So, in short, DXO ISO's have nothing to do with the camera metering, or the exposure of the final photo. Seems to me that it's a value of some interest to those who find sensor technology fascinating and of practically zero use to most photographers.

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