So you are two strange people then.

I'm being repressed.

Hmm, let me see. They repress millions and murder lots and then they send us a couple of pandas and everything is hunky dory.

I think not.

Nah. It would be crystal clear one moment and then cloud over in seconds flat.

Top Gear has just won an award for program of the last decade. Good on them.

I very much doubt it is predictive. I suspect the issue is speed or lack of it.

I use AF-S but with a full press of the shutter button so as soon as you get focus confirmation the picture is taken.

The other obvious tactic which I suspect we all use is to take the picture when the aircraft's relative velocity is lower.

I have to say I am slightly surprised here. Are we getting mixed up between continuous autofocus and centre AF point?I use the former off (it's a bit of a joke on the K20, never catches up with the aircraft) and the latter on.

Do you mean AF-C Chris?

I found this simply not up to taking fast aircraft shots with my K20 and 150-500 or DA* 300.

Yes. The "mAh" rating is the capacity of your battery. An increase will allow you to take more pictures and vice versa. An analogy would putting a larger or smaller petrol tank in your car.

Another possible use for the third and fourth contacts is balancing the charge in the cells. There are two cells in our 7.4V batteries and they are connected in such a way that an ordinary charger will shut down when the first cell is fully charged. Some more sophisticated chargers can charge each cell individually.