D90-What is "high gain up"?
I was reviewing a 1600 iso D90 test photo exif with iexif and noticed an entry for gain as such:
Scene Capture Type = Normal
Gain Control = High gain up
Contrast = Normal
Saturation = Normal
Sharpness = Normal
Checking the manual, I found limited info about gain, other than with multiple exposures.
So where / how is this used and set for single exposures on the D90 ?