Add a rod clamp to your 15mm rig to mount your follow focus with this SmallRig 4151 Rod Clamp .
The durable aluminum clamp has two 15mm rod ports and the distance between these ports is adjustable to accommodate different size lenses up to 114mm when using a follow focus system.
The clamp works with separately available standard 15mm rods and is designed for use with the SmallRig F60 or 3010 series follow focus.