BALD EAGLE IN FLIGHT WITH NESTING MATERIALS

I am going through my backup images looking for images to Post here and found this Bald Eagle in flight with nesting materials. I was using a Canon 1D mkIII camera with a Canon 400mm DO lens with a Canon 1.4x Teleconverter giving me a 560mm view. But the Canon 1D mkIII had a 1.3x cropped sensor which was like using camera with a view of 728mm.