Keeps the focus on a person as they come toward or move away from the camera. Even with shallow depth of field, the lead doesn't go blurry.
Shooting a person walking toward you or a car approaching with shallow depth of field. A rack focus changes the focus target; a follow focus keeps protecting the same one.
Not verified — add 'focus follows the subject' to the shallow depth of field wording.
Shallow depth of field, a girl in a yellow coat walks toward the camera along a leafy park path, the focus follows her face smoothly the whole way so she stays sharp while the trees behind stay soft, camera slowly backing away, 85mm lens, soft golden light, gentle mood, 6-second shot.
shallow depth of field, focus smoothly follows her as she walks toward the camera, background stays soft
Not verified