Our resident Hawk responded to my need
for wildlife to test shoot today
As tests, the only post processing on these photos is brightness and cropping, not even noise reduction.
The first three are shot at 1600mm, next three at 800mm. Not sure any difference can be discerned on the net, but the 800mm is slightly sharper on my monitor. I also struggled to get back far enough to get the entire body in at 1600mm, partially the reason I have shied away from a large prime as opposed to a zoom. 1600mm has its place, just not in my yard.
= new reply since forum marked as read
Ty for sharing with us! 
The red shoulder really stands out in these photos.
1600mm is a very long prime. Is that what you use for shooting aviation?
I wish all my avian subjects were this cooperative. Great shots!
And what good fortune to have such an amazing model to pose for you!
The details and the clarity are nothing short of astonishing.
