I spent some time at the lion exhibit at the Sedgwick County Zoo in Wichita, Kansas. This lioness was positioned in a location with a distant background...which helped the portraits. I used various combinations with Nikon Z9 and the the Nikon 400 2.8 TC -- 400mm, 560mm (with the 1.4x TC engaged) and 800mm (with a 2x TC attached and not engaging the internal TC).
1- This first one is with the Nikon 70-200 2.8 S, though--sometimes a little more space helps
2- Nikon 400mm 2.8 TC with the 2x TC...so lens is 800mm 5.6. I stopped down to f/7.1.
3- Nikon 400 2.8 TC with the internal 1.4x TC engaged...so the lens is a 560mm f/4. I shot this wide open.
4- Nikon 400 2.8 TC...shot at that focal length wide open
5- Nikon 400 2.8 TC with internal 1.4x engaged...so 560mm at f/4
