To give my poor shoulder a rest I’ve been using the 600 f/11 the last 2 months (as opposed to the 500 f/4). But it was so dark in the park this morning that I borrowed my old 100-400L M1 from my wife as I knew f/11 would be unusable. I still had to use ISO 6400 though.
Amazing what noise reduction software can do these days (at least with small low-res images like these).
These were taken in a park to the east of town. Crossbills are everywhere this autumn.