Nikon D800 User Manual (en)

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The ISO Sensitivity Menu
ISO sensitivity can also be adjusted using the ISO 
sensitivity
 option in the shooting menu 
(
Note that ISO sensitivity can not be adjusted from the shooting menu in 
movie live view. In exposure mode h, ISO sensitivity can however be 
adjusted using the 
S button and main command dial (0 109).
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Hi 0.3–Hi 2
The settings Hi 0.3 through Hi 2 correspond to ISO sensitivities 0.3–2 EV 
over ISO 6400 (ISO 8000–25600 equivalent).  Pictures taken at these 
settings are more likely to be subject to noise (randomly-spaced bright 
pixels, fog, or lines).
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Lo 0.3–Lo 1
The settings Lo 0.3 through Lo 1 correspond to ISO sensitivities 
0.3–1 EV  below ISO 100 (ISO 80–50 equivalent). Use for larger apertures 
when lighting is bright.  Contrast is slightly higher than normal; in most 
cases, ISO sensitivities of ISO 100 or above are recommended.
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See Also
For information on Custom Setting b1 (ISO sensitivity step value), see 
page 287.  For information on displaying ISO sensitivity in the control 
panel or adjusting ISO sensitivity without using the 
S button, see 
Custom Setting d7 (ISO display and adjustment
information on using the High ISO NR option in the shooting menu to 
reduce noise at high ISO sensitivities, see page 277.