After returning from a photo shooting session yesterday, I found that I had a sequence of a few shots in the middle that were drastically underexposed, though those before and after were fine. I believe that I inadvertently pressed the AE-Lock button for a few seconds, holding the exposure that would have been appropriate for reflected sun on a patch of water. The results manifested with auto-ISO sensitivity at the camera's minimum ISO setting of 100, while surrounding frames auto-set to ISO 400 or 500 along with a similar shutter speed and aperture. In any case, it's hard to identify the birds in this image as Black Scoters because, well, almost everything is black.
Quite a bit more to see there. I'm impressed. There's some noise to be seen, and I certainly wouldn't make a intentional practice of underexposing by 3 stops, but it's nice to see that it's still possible to extract a decent image.