The D610's Beautiful Sensor
JF69 wrote: So it's ISOless from ISO400; ie better to use ISO400 & underexpose (vs raising ISO) for preserving highlights & DR, right?
That's what the PTC from DxO's Full SNR curves would seem to indicate. However the optical black readings would suggest that there is still a slight benefit to going to ISO1600. I'd be curious to see what Bill Claff's PDR curve will look like, because he averages his data over several cameras.