Coal Tit

This photo was taken in my garden during January 2012.
The technical information is as follows.
Camera - Canon EOS 5D Mk II
Shutter speed - 1/800
Aperture - f8.0
Lens - Canon EF 500mm f4.0 L IS USM plus Kenko 36mm Extension Tube
Focal Length - 500mm
ISO - 1600
Tripod