Iso Auto - Nikon D100 Manual

Custom Settings
Custom Setting 3: ISO Auto
If ON is selected for this option, the camera will
automatically adjust sensitivity (ISO equivalency)
when optimal exposure can not be achieved at
current exposure settings. If sensitivity is set to
HI-1 (approximately equivalent to ISO 3200) or
HI-2 (approximately equivalent to ISO 6400), this
option is automatically set to OFF and can not
be adjusted.
Option
OFF
(default)
ON
Bank Select
If a shooting menu bank in which ISO has been set to
is selected for Custom Setting 3 (ISO Auto), sensitivity (ISO equivalency) will
adjusted automatically. Sensitivity will also not be adjusted automatically if a Custom
Settings bank in which ON is selected for Custom Setting 3 (ISO Auto) is chosen after
ISO has been set to

ISO Auto

If a Speedlight is used when ISO Auto is on, sensitivity (ISO equivalency) will be fixed at
the value selected by the user.
Noise
Noise is more likely to appear in photographs taken at higher sensitivities.
148
Sensitivity remains fixed at value selected by user, regardless of
whether optimal exposure can be achieved at current exposure
settings.
When optimal exposure can not be achieved at the sensitivity
selected by the user, sensitivity is adjusted to compensate, to a
minimum approximately equivalent to ISO 200 and a maximum
approximately equivalent to ISO 1600 (
not be set to HI-1 or HI-2 while this option is in effect.
or .
CSM MENU
F3 ISO Auto Control
OFF
OFF
ON
ON
Description
76). Sensitivity can
or
OK
is chosen after ON
be
NOT