Commlite CS-FO ILDC Camera Follow Focus Finder with Gear Ring Belt for Sony A7 A7II A7R A7S A7RII A7SII for Panasonic GH4 Cameras Mirrorless Camera Designed for ILCD camera, exact follow focus design helps to adjust focus. Damping design, good touch feeling. With a focus ring, better to meet your needs. Made of high strength aluminum alloy. International standard, mounts on 15mm rod support (rail center to center: 60mm).