These are some of the better pictures I got with the system I used.
Kowa 604 with 20 times wide eyepiece. Canon Ixus 800. Full frame at about 100 meters for the harrier and 40 meter for the waders. Although the distance estimates could be a way out
I have seen better examples but I do not know what they were taken with. In the end I was just not satisfied with the quality.