Custom Settings148Custom Setting 3: ISO AutoIf ON is selected for this option, the camera willautomatically adjust sensitivity (ISO equivalency)when optimal exposure can not be achieved atcurrent exposure settings. If sensitivity is set toHI-1 (approximately equivalent to ISO 3200) orHI-2 (approximately equivalent to ISO 6400), thisoption is automatically set to OFF and can notbe adjusted.OKISO Auto ControlF3 CSM MENUOFFONOFFONBank SelectIf a shooting menu bank in which ISO has been set to or is chosen after ONis selected for Custom Setting 3 (ISO Auto), sensitivity (ISO equivalency) will NOT beadjusted automatically. Sensitivity will also not be adjusted automatically if a CustomSettings bank in which ON is selected for Custom Setting 3 (ISO Auto) is chosen afterISO has been set to or .ISO AutoIf a Speedlight is used when ISO Auto is on, sensitivity (ISO equivalency) will be fixed atthe value selected by the user.NoiseNoise is more likely to appear in photographs taken at higher sensitivities.OptionDescriptionOFF(default)Sensitivity remains fixed at value selected by user, regardless ofwhether optimal exposure can be achieved at current exposuresettings.ONWhen optimal exposure can not be achieved at the sensitivityselected by the user, sensitivity is adjusted to compensate, to aminimum approximately equivalent to ISO 200 and a maximumapproximately equivalent to ISO 1600 (76). Sensitivity cannot be set to HI-1 or HI-2 while this option is in effect.