Morros Follow Focus Finder F4 for 15mm Rod Support DSLR and video cameras (F4 With Two Hard Stops) Present the most innovative and needed function-Movable Focus Indicator. 100% brand new and high quality. Half-round rod holes, quick to install and uninstall. Easy begin/end setup for accurate and highly repeatable racking between your desired indicator location with 2 hard stoppers. Completely gear-driven design for slip-free, accurate, and repeatable focus movement. Can be mounted from either side (works for both right-handed and left-handed). Mounts onto 15mm/0.59'' Rod Support (60mm/2.4'' center to center difference). Suitable for adjustable mount lens from 52mm-86mm. Precise setting of focus level. With quick release plate. Compatible with all DSLR cameras, video cameras.