Nikon D810 - Manual (Page 88)

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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 64 and Hi 2. 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 200 and Hi 2.
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.