Nikon D750 DSLR Camera (Body Only) - Manual (Page 350)

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Adjust the following ISO sensitivity settings:
• ISO sensitivity (mode M) : Choose the ISO sensitivity for mode M
from values between ISO 100 and Hi 2. Auto ISO sensitivity
control is used in other shooting modes.
• Auto ISO control (mode M) : Select On for auto ISO sensitivity
control in mode M , 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 modes
P , S , and A and
when On is selected for Auto ISO control (mode M) in
exposure mode M .
Movie ISO Sensitivity Settings
G button
➜
1 movie shooting menu
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 .