3200! I could only contemplate using that setting if there was no cropping required, at all! I can see the noise in your image but it remains relatively low in chromatic noise and instead presents merely like digital texture, much like the surface of sandstone, as if your image was printed on a perfectly flat canvas of very fine-grained sandstone. I could deal with your kind of noise easily enough in post processing but not with the noise my old t4i produces at 3200 ISO, although I do try to ameliorate it in PS. I guess that your 600mm reach is what makes the difference when compared to my 300mm.
I went out this morning but there was nothing to see. The park was silent except for the calls of cardinal, chickadees, goldfinches and song sparrows. I found one juvenile Magnolia warbler hanging around with the chickadees but it vanished before I could even point my camera. The light was also terrible. I anticipated an uneventful morning because of the east wind. North wind is the best, NW is OK too, but an east wind blows no good. I
did see a Bald eagle fly by. I heard it and looked up toward the lake but couldn't see anything until it emerged from behind a tree at the edge of the bluffs. By the time I tuned on my old camera it was behind another tree, and then another after that. When it finally appeared in the clear it was too far away and all I managed was a 300mm shot of a retreating eagle. There was no time for iris compensation to the right to make up for the bright sky. I wasn't shooting in RAW either ... I seldom do. I may try again tomorrow. I'll need to check the overnight wind direction. I've heard that tomorrow will be humid ... mmmm ...
mosquitoes.