hmm...another nice read from you @wald.sinnen. Let me bring it to the community and let's see what would happen. wish you all the best
one more thing: you have strong enough lens to zoom in, it would be very interesting if you have zoomed in that fox.
It is zoomed in but not brilliant focused. Perhaps the camera must go through a service - it gets slower and slower. I wonder if it were more than 100 meters, because the geese up in thebsky are so close and sharp, but my husband is certain about the 50 meters distance - however the experience of the meeting is burned to my heart and sometimes a first meeting breaks a bann and will make me spot more foxes in future like my first meeting with an owl - but that‘s another long story I will tell perhaps in one of my next posts ;)
I am not sure it was the problem with the camera, but with the lens, I guess it was auto focus wasn't it?, the problem with auto focus is sometimes the focus is not at the right point. I prefer to use manual focus to auto. As long as the photo is sharp you always can crop the frame for closer look and that is still okay to get better look of the object, I am not the expert on such thing too. if you can find service center, it will better to check with the expert.
Yap, that is good idea to make in another complete post, I am preparing an article as well, I hope I can post it to night.
Will love to read it!