Originally posted by Jed
Well tracking an F1 car full frame-ish with a long lens like a 300, 400, 500 or 600, possibly with converters, means that the rate of change is fairly small, because you're focusing at quite a distance.
Also as I've explained before, crashes aside, F1 cars tend to move in easily predictable motions, unlike the stop-start effect of football players. When you're focusing at about 10m away from you, the rate of change is also higher relative.
Lastly, motorsport tends to happen in ample light in the daytime, whereas more than half our work is done under floodlights at night.
Tracking an F1 car about 20m (approaching, not passing) would be more taxing than football probably, but otherwise, my experience is that football is more taxing. Yes I've shot enough motorsport myself to know, although not F1.