Nikon D3x Mode D'Emploi

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ISO Sensitivity
– Reacting Faster to Light
“ISO sensitivity” is the digital equivalent of film speed.  The higher 
the ISO sensitivity, the less light needed to make an exposure, 
allowing higher shutter speeds or smaller apertures.  This chapter 
describes how to set ISO sensitivity manually and automatically.
Choosing ISO Sensitivity Manually............................  pg. 104
Auto ISO Sensitivity Control........................................  pg. 106