Peter Connan: The first picture is adorable as such. That said I want to know more about tracking.
Do you use the AF-ON-technique that many Action shooters apply (and I have never even tried in my life)?
Thank you and Bjornthun for the compliments.
Frank, yes I do. I also very carefully select the number of focus points for the subject and background.
If the subject is small or far away, and especially if the background is busy or of similar contrast to the subject, one has to use the minimum number of focus points. As the object becomes larger or closer, and the background cleaner, so more focus points can be enabled.
So for the three birds in that post, I would have used either Group Area, or 9 points, whereas for the plane in my earlier post all 51 points would have been fine.
If many focus points are active, covering both subject and a busy background, the camera has no good way of determining what the object is.
3-D is supposed to be able to do this, but I have had no success with that. Perhaps the D5 with it's dedicated AF processor might be significantly better. Only time will tell.