Nice to know that you also have a 400mm f2.8. Is this the Version II with IS?

If the jeep is moving then getting a sharp shot becomes tough. We try to visualise the ideal scenario. It has been proved in many scientific learning studies that people learn equally effectively when they imagine. So we try to think of situations and offer suggestions some of which may not be possible to implement due to various constraints.

Cheers,
Sabyasachi