Nikon D800 User Manual (en)

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Playback Zoom
To zoom in on the photograph when the 
histogram is displayed, press 
X. Use the X and 
W buttons to zoom in and out and scroll the 
image with the multi selector. The histogram will 
be updated to show only the data for the portion 
of the image visible in the monitor.
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Histograms
Camera histograms are intended as a guide only and may differ from 
those displayed in imaging applications. Some sample histograms are 
shown below:
If the image contains objects with a 
wide range of brightnesses, the 
distribution of tones will be relatively 
even.
If the image is dark, tone distribution 
will be shifted to the left.
If the image is bright, tone 
distribution will be shifted to the 
right.
Increasing exposure compensation shifts the distribution of tones to 
the right, while decreasing exposure compensation shifts the 
distribution to the left. Histograms can provide a rough idea of overall 
exposure when bright ambient lighting makes it difficult to see 
photographs in the monitor.