The ZEK-1 is the perfect solution for controlling your camera's zoom. The PTR-10 Mark II can read its own rotational position and send it back to the controller for position storage and instant recall. Now, with the ZEK-1 motorized lens control ring, you can detect and adjust zoom settings, storing them for easy recall by the controller. By engaging the ZEK-1 gear with the camera's zoom ring, it reads the rotational changes of the camera's zoom ring.