Canon 200-400mm f4 L IS 1.4X
Considered to be one of the most versatile Canon telephotos without compromising image quality, all while having the added benefit of a built in 1.4X teleconverter. 
This example is in good condition with only minor cosmetic marks externally. Optically excellent and functionally perfect. Comes with aftermarket Really Right Stuff lens foot (Arca Swiss compatible), lens hood, rear lens cap and Canon hard case.