Auto Focus – (One shot) (AI Focus) (AI Servo)
One-Shot AF – Once shutter button is pushed halfway, camera focus is locked.
AI Focus (Artificial Intelligence) Camera decides whether subject is moving or stationary. The camera will switch from One-Shot AF or AI servo AF.
AI Servo (Artificial Intelligence) once shutter button is pushed halfway the camera continues to focus. The lens will continually maintain a focus on the subject making it a good choice for actions shots.