We test Sony’s firmware update for the Sony a9 (http://sdp.io/a9). Eye AF was excellent before, and it’s a little better now – though it still fails in heavily backlit situations. Lock-on AF tracks a subject as it moves across the frame. Before the firmware update, Lock-on AF was almost useless. Now, Lock-on AF is extremely useful for sports and even still subjects where focus-recompose is easier than manually changing focusing points. Finally, I discuss the importance of being able to delete a group of photos all at once.
Previous reviews of the a9:
Red dot on the back: https://www.youtube.com/watch?v=3TxkGJO3jls