They don't show donuts at infinity, and I suspect your targets are pretty close to that far away Paul. Hypered film is nice stuff. I've always wanted to shoot b&w through an old Schmitt. Maybe like the 48". Those make the most lovely images of star fields that I have ever seen.
A straight-forward approach may or may not work for a given application. In this case, with this Mute Swan, I secured a few shots of the nestlings and their watchful mother cruising close by, then went off to do more entertaining stuff. I'm in the process of collecting material for a joint photo/rock presentation later this Autumn and there I need more "fleeting" images.
So many clever people can do all these amazing tack-sharp shots of birds and I won't interfere with their endeavours. I have my way and let them have theirs.