These were taken with D800 1.5Crop mode on 600VR + 1.7TC. Images are at least 50% cropped. ( car window+ bean bag)
I have taken similar shots with my D200 that I have posted here. https://www.fredmiranda.com/forum/topic/1107108
Below ISO 400 my D200 gives very similar IQ as long as I get the exposure perfect.
D800 in crop mode gives bigger files to work with. The noise is much less so I can shoot at higher ISO settings. The shadow recovery and the AF is better too.
beautiful images. I like the intensity in the Mom's eyes, the tranquility of the chicks, they must be feeling safe. And #8 - never seen an eagle picture like that one - it is much more than wonderful. Thanks for sharing them.