The AO series is a focusing module which can be mounted in front of a fixed focal length lens to rapidly change focus. The AO series allows the user to refocus the lens faster than mechanically moving the lens with traditional motorized solutions. The built-in driver has been specifically developed to accurately control the piezoelectric elements. A demo user interface with basic control functions is available via a web browser interface. The lens can also be fully controlled with a dedicated .dll library, downloadable from the Opto Engineering® website. The library includes an autofocus algorithm and a calibration tool to help users integrate the AO module into their product or application.