On a marsh trail we had walked out into a wide open area, a view of the entire marsh. A large number of Ibis and Egrets were near and this one flew up towards us.
Being really fast in flight I expect to grab a single shot or two. However this time I panned with the Ibis as he passed in front.
Later on I found most of shots were in focus, in the center view finder.
How often does that happen?