Nikon D4S - Manual (Page 98)

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• Movie ISO sensitivity settings: Adjust the
following ISO sensitivity settings.
- ISO sensitivity (mode M)
: Choose the ISO
sensitivity for exposure mode h from
values between ISO 200 and Hi 4. Auto
ISO sensitivity control is used in other
exposure modes.
- Auto ISO control (mode M) : Select On for auto ISO sensitivity control
in exposure mode h, Off to use the value selected for ISO
sensitivity (mode M).
- Maximum sensitivity : Choose the upper limit for auto ISO
sensitivity control from values between ISO 400 and Hi 4. The
lower limit is ISO 200. Auto ISO sensitivity control is used in
exposure modes e, f, and g and when On is selected for Auto
ISO control (mode M) in exposure mode h.
A
Auto ISO Sensitivity Control
At high ISO sensitivities, the camera may have difficulty focusing and
noise (randomly-spaced bright pixels, fog, or lines) may increase. This
can be prevented by choosing a lower value for Movie ISO sensitivity
settings > Maximum sensitivity.