Doing my normal shooting -- Tamron 150-600, tripod, manual/auto iso 6400. Everything fine walking about. Spotted a resting hummer, set up for some shots. When I looked at them, they were whacky. Here is a sample one second burst:
1/320, -.07 ev (as set by me)
1/160, +.03
1/320, -.07 ev (as...