Nikon D3S - Manual (Page 137)

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The ISO Sensitivity Menu
ISO sensitivity can also be adjusted using the
ISO sensitivity option in the shooting menu
(
0 284).
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Hi 0.3–Hi 3
The settings Hi 0.3 through Hi 3 correspond to ISO sensitivities 0.3–3 EV
over ISO 12800 (ISO16000–102400 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 200 (ISO 160–100 equivalent). Use for larger
apertures when lighting is bright. Contrast is slightly higher than
normal; in most cases, ISO sensitivities of ISO 200 or above are
recommended.
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See Also
For information on Custom Setting b1 (ISO sensitivity step value), see
page 302. For information on using the High ISO NR option in the
shooting menu to reduce noise at high ISO sensitivities, see page 291.