Ok, a quick focus (if you pardon the pun!) on equipment. I took this shot with the amazing Canon 70-200 f/2.8 IS L MKII lens with a 1.4x MkII converter fitted. Converters / extenders increase the focal length of the lens, but at the expense of the effective aperture (how much light gets through) and usually some loss in quality.
The 70-200 MKII is staggeringly sharp on its own & really really good with a converter fitted - so good that if we crop-in to the head of the duck we see some detail we might otherwise have missed!
Please do click on this shot for the full effect!
Canon EOS-1D Mark III, f/5.6 @ 240 mm, 1/400, ISO 200, Flash