Male Tufted Duck

This photo was taken at Linlithgow Loch during February 2011.
The technical information is as follows.
Camera - Canon EOS 5D Mk II
Shutter speed - 1/800
Aperture - f9.0
Lens - Canon EF 500mm f4.0 L IS USM plus Canon Extender EF 1.4x II
Focal Length 700mm
ISO 800