Black-winged Stilts blur

Hi all. Here's yet another blur image...this time Black-winged Stilts, taken at the same location as my previous one. I'm still experimenting with settings.
7Dii, 100-400@400mm, 1/15th sec, f20, iso100, TV mode HH.

Well Paul you seem to have solved the problem if getting sharp shots :bg3:. In this case the leading birds needed to be in full view IMO, one frame too late maybe. Does seem a waste of a lovely flock of Stilts though.

I like this approach. Well done impressionistic image.

Hi Colin. Yes..I agree re the leading birds. Plenty of Stilts at this location!
David: Thank you very much.

Well this sure does show a nice sense of motion. Too bad about the birds on the left hand side. Like the streaks in the background.

Thanks John...I agree re the birds on the LHS. Cheers.