This pair of eagles was shot on the Mississippi River near Wabasha, MN. These guys were on the far side of the river, and I set up my 400mm with 2x TC and 1.4x TC stacked to make 1120mm f/16 (add the cameras 1.6 crop factor for equiv 1792mm).

The light was low so I shot at high ISO on my 350D which is one of the many reasons this is not super sharp.

100% crop