Install the follow focus wheel on the side of the middle frame of the DJI RS 2 / Ronin-S / Ronin-SC, and match the follow focus motor of the corresponding product to control the camera’s follow focus or aperture

The DJI R Focus Wheel can be attached to the side of the handle of DJI RS 2, DJI Ronin-S, or DJI Ronin-SC to control camera focus. When paired with the DJI Ronin Focus Motor, it can control the focus, iris, and zoom.

the focus wheel comes with the proper screws for mounting it to the Ronin or similar fixture, along with the appropriate allen wrench.