Kriegs - it is the lack of light in the AF system that cause the AF to fail (you need a sharp enough edge (or sharp contrasting pixel vales) to activate the AF system.. batt or fps dont improve it..The slower AF using TX was expected, no surprise to me. Okay for normal sporting events. But a bit slow for ultra fast moving objects.
Just wondering the extra boost of fps from using bat packs on higher end bodies would translate to extra power into the lens motor.
Good point about lack of fast moving objs maybe should reroute to it show for testing. Pan moving people lolz.
Depending on your settings, your FPS could be very, very low if AF is not tracked (i.e. you can set to a mode where it will shoot even if your AF is not tracked yet)
ZCA, I think you are SPOT-ON for that.. for the longer tele-lens, at least at the 500m or 600mm.. there are buttons on the lens where you can recall the previous focus distance/point using the "Focus Preset function"..ultra fast-moving? You mean F1 cars?
I think they don't expect the camera's AF to keep up with the car's speed ba.
Someone once said that he pre-focused (yes... MF) to a spot on the track where he wants to photograph the car. Then track the movement and 'bam!' when the car is at the spot.