Here is one more from my weekend´s walk. At this time the light started to fade, so I had the 1.4xIII removed and shot at 1/500s, f4.0 and ISO4000 (still 7DII and 600 f4L IS II)
If you have not photographed small birds before, I suggest you give it a go. They are SMALL as in TINY. And they don´t sit still. First you have to spot them, then you have to find them in the view finder, with the lens totally off focus, then you have to focus and compose and push the shutter release and you have about 2 seconds to do all that before the bird is on the next branch. This is not recreation, this is stress
Lovely shot of the Great Tit (Talgoxe, Kjötmeis), Eldar!
I know what you're going through with these small fluffy friends. And you have an even narrower fov with the 600mm than I have with the 400mm. The first shot is almost easier to get than after any branch jumping. I routinely try to re-adjust my focusing distance on the lens before I lift it for the first shot - mostly keeps me in the right neighbourhood, and saves a few ms in acquiring full focus on the bird.
They're doing what they are expected to do, so, at best, I find them annoying, but never stress inducing.