I'm currently in the Canadian arctic starting a 3 year research project on Peregrines. Up until now I haven't had much contact with this species (especially tundrius), but I'm having an absolute blast watching their unmatched aerial agility/speed. The shadows in this image are a bit distracting but I'm having great difficulty composing images; my BIF pictures have so far been more reactionary than anything.
Canon 7D 400mm 5.6L
ISO 400
1/2500
5.6
No cropping on top, just enough on the bottom so that both wing tips are equal distance to the frame's edge.
Highlights dropped a small amount and shadows bumped up an equal amount.
Nice rolling over screaming pose from this Peregrine. Nice and clear too but as mentioned, the harsh light wasnt your friend. Maybe try to tame down the highlights on the back a bit and I agree with a vertical comp. Well done and keep hammering away at these guys.
Still a great capture even with those shadows. I hope you'll get some more opportunities with softer light but I already like this shot, good sharpness and nice screaming pose of the bird.