:)
I was photographer for my high school newspaper and annual in 1970-1972 and have been a photo hobbyist ever since. I’ve spent a lot of time in darkrooms and even won a couple of small time photo prizes.
Once you get past a certain point it is all infinity. It doesn’t matter if the object is moving towards you or away from you, until it is actually time to refocus because the object is getting too close. Well, that and as it gets closer, especially if you are zooming in, the motion will be more amplified and it will be harder to keep the subject centered. If it is moving away it will get easier. Again, it is that x/y axis movement thing.
Big difference between analogue photography and digital videography. Old film is infinite pixels.
Nonetheless, adding a doubling lens will degrade you ability to control the shot. The better the lens’ the more room you will have theoretically. The effect I’m talking about is far more noticeable with wide-angles, there is a zone it works good in then you begin to lose control once you get out of that zone.
Had this camera not been maxed in its parameters it would have been clearer. Had he the proper filters for the atmospherics it would have been clearer.
If your assessment of this being an aircraft moving towards the camera my points would be moot. The shot of a closer object moving at a lower speed and altitude would have been much easier to capture with the set-up mounted on that chopper.