Amazon.com : Original Ronin-S/SC Follow Focus Wheel Used to Control The Camera's Follow Focus Zoom Or Aperture for DJI RS 3 Pro/RS 2,Ronin-SC,Ronin-S : Electronics
Amazon.com : Ronin 3D Follow Focus System for DJI RS 2, DJI RS 3,DJI RS 3 Pro (Requires use with DJI Ronin Follow Focus Motor) : Electronics
DJI Focus - DJI
DJI Ronin M Follow Focus Mount. Part No 2 Build Your Own Drone