Mallard Chicks

This photo was taken at Bellsquarry Birchwood, Livingston during May 2011.
The technical information is as follows.
Camera - Canon EOS 5D Mk II
Shutter speed - 1/1250
Aperture - f67.1
Lens - Canon EF 300mm f4.0 L IS USM plus Canon Extender EF 1.4x II
Focal Length - 420mm
ISO - 1600