Wow, weeks of silence, then suddenly so much criticism... Thanks CarlTN for helping out.
To repeat- the original post was not intended as a scientific/pro analysis of the 6D AF. Just me- a hobbyist
- pleasantly surprised that the camera could easily
achieve something that my previous camera- a Rebel- could not. (Almost never, in fact.) Believe me, guys- these air-to-air shots are not so straight forward. So far the 6D has nailed it every time I've tried to take one of these shots.
Yes, the closure rate was about 900kts. You have to add the groundspeeds which include the headwind/tailwind components, not just the true airspeed. I was there, I saw the numbers for myself- I was in the flightdeck of another airplane going in the opposite direction one thousand feet below the aircraft in the photo. The two aircraft tracks were almost reciprocal- the divergent headings are mostly a result of the very strong jetstream that existed at the time the photo was taken.
The shot is cropped but is otherwise SOOC- no post.
Sheesh. Any more hairs you fellows wish to split?