Like many of you, I photographed the lunar eclipse - in my case with a Nikon Z6 and a D850. My lens was the Nikon 600 f/4 AFS VR - and for a few shots also with the TC14E III teleconverter. For the Z6, I used the FTZ adapter.
I had a strong preference for the Z6 over the D850. I used Pinpoint AF, and through the viewfinder found it was much easier to achieve sharp focus and check focus. With the D850, the OVF was dim during totality and it was very hard to accurately focus without LiveView. LiveView was a bit grainy and slow to focus. In comparison, focusing with the Z6 and the EVF was fast, accurate, and easy.
Exposures were using Electronic Front Curtain Shutter and Exposure Delay Mode at 3 seconds.
One of the key questions for me was the point at which subject motion - the earth's rotation - caused blurring of the image. The Z6 and D850 have remarkably low noise at high ISO levels, but when you start recovering shadows and cropping deeply, the noise is more pronounced. With high resolution cameras, we can get sharp images and view them at 100%, so rotation of the earth is a factor.
I tested shutter speed down to 1/5 sec, and ISO levels up to 1600. I could have gone a little higher with ISO, but ISO 1000 to ISO 1600 seemed to be the sweet spot. With shutter speeds of 1/8 sec I had obvious motion issues turning stars into short lines. I could get away with 1/8 sec. with modest cropping at 600mm, but with the teleconverter and effective 850mm, 1/8 sec had clear motion impact seen in stars.
Here was an eclipse image during totality. This was with the Z6 at 1/8 sec, f/4, ISO 1250