This is a tribute to the AF of the Sony a9. This killdeer was flying close and erratic, when I had my a9 mounted on my 560mm rig. I could barely get the bird in the EVF and often I'd see a blur, but still activate AF. I didn't think that I had anything, but when I got home there were five nice flight images (out of about 100). I was using all 693-AF points, in the Tracking mode.
Killdeer Flies By - Shot 1 by
David Stephens, on Flickr