Follow Focuss are mechanisms that allow cameras to focus.

The main function is to change the focus during shooting, especially when you want to zoom in on another subject.

The Preset Srl makes available several different for rental, including:

The Dji Focus (Radiofuoco) TVCAM is a wireless follow focus, which has accurate and accurate performance.
The Spallaccio with Matte Box and Follow Focus, consisting of a set of components that allow you to build a support cage for the camera.
The wireless DJI Focus which includes the Ronin Jimbals and the Ronin-M.