One Shot AF: An image cannot be taken unless focus is achieved. When focus is achieved, it is locked. With evaluative metering, the exposure setting is also locked. (The exposure setting is stored in memory before the shot is taken.)
AI Servo AF: Autofocus tracks the moving subject, and the exposure is set when the shot is taken. The camera attempts to track a moving object during continuous shooting.
AI Focus AF: Automatically switches between ONE SHOT AF and AI Servo AF according to the subject status.
