Now I’m ready to tackle the question that interests at least some of you: how does the sensor in the Nikon D810 compare with the one in the Sony alpha 7R?
The D810 has greater full well capacity:
But the a7R has lower read noise through much of the ISO range:
When you put those things together, the D810 has a greater engineering dynamic range, but you have to go below ISO 64 to get to the part that’s better than the a7R:
If we concern ourselves with Claff photographic dynamic range — and I think we should — here’s how the two cameras compare, with the a7II thrown in for good measure (we can do that fairly, even though the a7II has lower resolution, since the Claff PDR takes resolution into account):
ISO setting sensitivity is not standardized among camera manufacturers. If we look at Claff PDR with the ISO settings expressed as stops over base ISO, here’s what we get: