How do I operate the FocusONE? Ashley July 26, 2018 20:29 Follow Please check out our User's Manual video below to learn how to operate your focusONE! Related articles Do I need batteries for the Focus Module? How do I attach the Focus Module? Why is there play on the knob of my FocusONE? Is something wrong? Can I operate the FocusONE without a lens gear attached? Why does my Focus Module lose focus when tracking an object? Comments 0 comments Please sign in to leave a comment.