Sometimes you can get close. This was a one-year old leopard we observed stalking a pangolin for about three hours. I previously posted about the encounter at this link. We were obviously able to get very close, and I used my long lens (and a generous crop) to zoom in on the leopard’s eyes for this tight portrait.
Nikon D800 with Nikkor 200-400mm lens (at 400mm) ISO 800, f/5 at 1/160th of a second