Canon 7D
Canon F/2.8 300mm with 2xTC
f/5.6
1/1000
ISO 250
Cropped and processed in CS6
Captured this duck on a local loch, Fife, Scotland.
The bird saw me, even though he was a good distance away, and started swimming fast, away, from where I was standing, he turned around, and I was able to capture that golden eye
(first image I had taken with my new Canon 2x TC, and I am very happy with the result)