Nikon D850 User Manual page 144

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ISO Sensitivity
The higher the ISO sensitivity, the less light needed to make an
exposure, allowing faster shutter speeds or smaller apertures, but the
more likely the image is to be affected by noise (randomly-spaced
bright pixels, fog, or lines). Noise is particularly likely at settings
between Hi 0.3 and Hi 2.
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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 25600 (ISO 32000–102400 equivalent).
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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 64 (ISO 50–32 equivalent). Use for larger apertures
when lighting is bright. Contrast is slightly higher than normal; in most
cases, ISO sensitivities of ISO 64 or above are recommended.
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See Also
For information on:
• Choosing the ISO sensitivity step size, see A > Custom Setting b1
(ISO sensitivity step value; 0 262).
• Displaying ISO sensitivity in the control panel, see A > Custom
Setting d3 (ISO display; 0 264).
• Reducing noise in photos taken at high ISO sensitivities, see C >
High ISO NR (0 253).
• Reducing noise in movies shot at high ISO sensitivities, see 1 > High
ISO NR (0 258).
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