This article is intended for oral disclosure only.
The Subject Tracking AF continues focusing by following main subject inside wide focus area while shutter-release button is pressed partway down whether the subject moves or the camera position is changed.
Single-shot AF locks the focus when the shutter-release button is pressed partway down.
Full-time AF continues focusing when the power is turned on.
In Auto mode, Full-time AF and Subject Tracking AF are automatically set.