Video: https://www.youtube.com/watch?v=EJPmydZuk2E This is a Universal Follow Focus ring for non Cine Lenses. Upgrade your current lens for easier use on the rig with this extension. The inner diameter is 82 mm and thickness is 12.5mm same as a standard Follow Focus, so design and print out the fillers based on your current lens Who are we? http://www.designcartel.co1) Print out the Focus Ring 2) Measure your lens focus ring and created the filler up to 82 mm in diameter. See the video for more info.