Impressed and pleased with the resolution.

[DrEntropy]

The D850 with the 80~400mm, 1/2500th @ ∱6.3. The ISO went to 4000 (MAX I've set it to). Used the GIMP curve tool on the original (unworked full frame at right) to pull detail from the darker areas.

 

[Basil]

What's the aperture range on that lens? Looks pretty good and not much noise for that ISO.

 

[DrEntropy]

What's the aperture range on that lens? Looks pretty good and not much noise for that ISO.

It's this Nikon ∱4.5~5.6.

 

[Basil]

It's this Nikon ∱4.5~5.6.

Reason I asked is I noticed you were at 6.3. Maybe if you have another similar shot, open her up as much as possible, which might let you bring down the ISO a tad. Just a thought.