Unless the distance of the camera and the subject do not move at all, the focus will be actively changing - yes. Depending on various conditions (lighting, len

Unless the distance of the camera and the subject do not move at all, the focus will be actively changing - yes. Depending on various conditions (lighting, lens choice, etc) there might be a very large distance range that is in focus - or it might just be a few inches. Even if the focus puller isn’t doing any big focus swings, they are likely making small adjustments.