70-200 f/4L @ f/4
Shutter speed varied to maintain constant exposure with ISO change.
Custom picture profile (sharpness at 0, contrast at 0, saturation -1).
White balanced for tungsten lights, but subject's skin still looked green.
I underexposed 2 stops at the end to see how more drastic the noise is when the image isn't exposed properly.
2 photos posted compare ISO 160 to ISO 12800 (with 100 Lightroom noise reduction in both luminance and color noise).