Here I am ! in the tree! vireo

Usually you get warbler neck trying to spot these as they hang out at the tops of trees. But since the neighbor's yard is lower than ours and the trees are not that tall.... 
This was a surprise find as I got out of the car at 6:45 coming home from work. I heard a suspicious bird call in the tree ,ran for the binoculars , found the camera instead and the bird- singing on the end of a branch! Not hiding behind a leaf!. And a red -eyed vireo!.Surprise! I had the ISO on 640 and a relatively low shutter speed since it was so dim ( I would ask why it is always so dim , except I know the answer is it's NY and we're only allowed one sunny day a week..) so it is not as sharp as I would like but how often do you get a vireo this low in a tree?