Does anyone have an idea how the D800 compares to a D3x
When we say "downsample", it's a way of saying that we want to compare at the same output size and viewing distance. PDR is normalizing in that way. So this chart shows the D3X, D700, and D800 PDR curves. Note that we don't know for sure what the curve will be for the D800 lower than ISO 400. Also note that it is the horizontal differences between curves that is generally more important.