Sedge Warbler

This photo was taken at the RSPB site at Baron's Haugh, Motherwell during May 2010.
The technical information is as follows.
Camera - Canon EOS 50D
Shutter speed - 1/1600
Aperture - f8.0
Lens - Canon EF 500mm f4.0 L IS USM plus Canon Extender EF 1.4x II
Focal Length 700mm
ISO 400