I shot this today, I'm quite chuffed at my luck.
It was quite inquisitive and kept "buzzing" me, after a while of trying to follow it around and focus 'on-the-go', I gave that up and manually focused at identifiable distance and waited until it passed through 'the zone' and let rip with the continuous shoot mode. Only got two frames and in the second, all I got was its tail, but this one was just great. Sadly it disappeared after that, so no chance of a re-shoot.
Note to self for next time; use a better aperture (e.g. f8 or f11), I was really lucky getting this almost sharp at f6.3 at 250mm, at about 6 feet (2m) range. The shutter speed of 1/4000s explains the frozen wings, although it metered wrong and made it 2 stops under, so another bit of luck, at 1/1000s, they wouldn't have been sharp. It wasn't huge, I'd say about 3-4 inch wingspan (100mm).
Little PP (for me);
1) ACR 5.4 Auto, then fine tune exposure, recovery and blacks, open in PSE6
2) Crop from 4282 to 1262 width, so this is full size
3) USM for LCE: 20%, 45px, 0t.
4) USM for sharpening: 250%, 0.4px, 1t.
5) Convert to 8 bit and sponge away what I think was a bit of CA around a specular highlight.
Hope the info helps others.
C&C welcome
Cheers,