Here is a real-world example showing the extreme usability of the D810 in salvaging an image ...

When one uses the Nikon D810 at Base-64 ISO (a feature unique to the D810), he or she can do some incredible things with poorly-captured images.

So let's see how this works at some larger sizes:

The above image is the only capture of this lizard I was able to get before it ran off, while on a hike, which image was severely under-exposed.
(Keep in mind, this image displayed here is only 1200 px-wide, the original image was 7400 px wide.)

With most cameras, that do not have the D810's unique Base-64 ISO, the above capture would have been an essentially unusable image, because all of the detail would have been lost.
However, because the Nikon D810 can still capture incredible detail even in an under-exposed image, I was able to move my slider over to increase the exposure, and crop the image like this:

And from the larger, under-exposed image I was able to develop a full-sized, nicely-detailed image like this:

Even better, because of the extreme quality of the sensor (as well as the Voigtlander 125 f/2.5 APO Macro lens I was using), I was able to crop to an even greater extreme, like this:

The unique characteristic of a Base-64 ISO enabled me to come out of this with a very detailed, ultra-close macro-portrait of the animal, like this:

While not absolutely perfect, the above image certainly is usable (and better than many entry-level camera/lens combos can achieve at true 1:1).

Here is a nearly-noiseless, 90% crystal-clear, full profile of this Great Basin Fence Lizard that was able to be developed and salvaged from a rather dark, far-away shot that wouldn't be usable if taken by most systems.
(And if you really want to see astounding, you should see a full, 100%, 7400 px-wide macro shot taken in optimal light )

As of this writing, the Nikon D810 still offers the greatest Dynamic Range at its Base 64 ISO setting, which combined with the sensor's ability to still capture "shadow detail" in under-exposed situations, is a great combination for the nature photographer, allowing him/her to salvage fleeting opportunities that might have otherwise been lost.

Thanks for reading,