This shot courtesy Bill Janes is the back LCD of D200; the subject is T4110 transmissive Stouffer grey step wedge composed of equally spread 41 steps, density step = 0.10 (1/3eV), maximum density = 4.05, more about the product here: http://www.stouffer.net/TransPage.htm#transmission step
The whitest part of the wedge corresponds to the second (massive) peak from the right. The rightmost small peak is due to light leak.
This is not a scientific test, but a demonstration how Nikon calibrate their default tone curve in cameras; it also allows to match histogram with exposure compensation (for green channel only of course, if you do not use UniWB).
The whitest part of the wedge corresponds to the second (massive) peak from the right. The rightmost small peak is due to light leak.

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This is not a scientific test, but a demonstration how Nikon calibrate their default tone curve in cameras; it also allows to match histogram with exposure compensation (for green channel only of course, if you do not use UniWB).