DxOMark's measured ISOs vs. manufacturer ISOs

Started Mar 13, 2013 | Discussions thread
xpatUSA
xpatUSA Forum Pro • Posts: 14,756
The problem with ISO is . .
1

The revered Organization has attempted to describe a complex variable with a single number, as is common in the world of photography. The several definitions in the Standard are a minefield of confusion. Therefore "ISO" represents different strokes for different folks and this thread will probably never end.

One tiny case in point:

The standard allows a method based on sensor saturation. My camera's sensor manufacturer states that the sensor well capacity is 77,000 electrons. "Oh goody!! That'll be the figure then!". Nope. They go on to say that exposure is "normally" limited to 42,000 electrons for best linearity. So off we go into vagueness-land and who knows what the camera manufacturer might choose to do.

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Regards,
Ted http://kronometric.org
SD10/70mm Macro/17-70mm zoom

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