Canon EF 400mm f/2.8L IS USM - Sample Images
Info and images of the lens:

Introduced: 1999
Optical design: 17 elements in 13 groups
Lens mount: Canon EOS
Covers: Full-frame (24×36mm)
More info can be found here: http://www.the-digital-picture.com/Reviews/Lens-Specifications.aspx?Lens=327
Review:
http://www.the-digital-picture.com/Reviews/Canon-EF-400mm-f-2.8-L-IS-USM-Lens-Review.aspx
Image Origin
ISO: 100
Aperture @: f/2.8
Camera: Canon EOS 7D
Image Origin
ISO: 100
Aperture @: f/2.8
Camera: Canon EOS 7D
Image Origin
ISO: 125
Aperture @: f/4.5
Camera: Canon EOS 7D