I set the ISO on Auto and let the camera change the ISO while manually controlling the shutter and apeture. The ISO fluctuated from 20,000 to 40,000 on the various exposures. This is the info on the photo below..
Model: Canon EOS-1D X
Frame #: 5303
Lens (mm): 16
ISO: 32000
Aperture: 3.5
Shutter: 1/40
Exp. Comp.: -1.0
Flash Comp.:
Program: Aperture Priority
Focus Mode: AI Servo AF
White Bal.: Custom
ICC Profile: sRGB IEC61966-2.1
Contrast: 0
