Custom Cine Follow Focus

Here is a manual how you can measure the lens by your self :
You have to measure the perimeter of the focus ring from your lens. You can do this by using a caliper or flexible measuring tape.
We recommend the measuring tape. If you don’t have one at home – just download this measuring paper :

Measurement for Custom Cine Follow Focus
(Make sure to print it in 100% size ! ) :

If you are measuring the diameter, you just have to multiply it with 3.16 to get the perimeter.

To find out the required inner perimeter of the gear, lay the measuring tape around the focus ring of your lens and pull it tightly together.
In this example the perimeter of the lens ist 230 mm.

The width of our gears is usually 10mm, which is enough for the common follow focus systems. Some lenses have a smaller focus ring.

The last specification for the custom follow focus gear is the thickness of the gear. The thickness is the difference from the inside diameter to the outside diameter of the Follow Focus Ring.
We usually produce our gears with a thickness of 8mm which is perfect for a good ring stiffness.