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I try to understand : "Zone V" is 2,5ev below white (each zone correspond to 1/2 ev), it correspond to 18% grey scale ...
For a 128 grey, the histogram spike is at the middle of the lightroom histogram, and is only 1 ev below white !  (and Lightroom histogram seams to be equal to Nikon histogram)
So, on fig3, the -3ev (256/8) line would be very on the left of camera histogram .... ?
To confirm, we have to create a Log and a Lin grey scales, and see them with photoshop or lightroom ...
(excuse me for my badly english)
You can  anser me to gilles.toutou@gmail.com
 
 

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