What remote focus system is this? (on Westworld)

[Vince Sweeney 3]

Saw this behind the scenes video on Westworld, which shoots on 35mm film, and wondered what this FF system was and how it works?

[Gabriel Elder 1]

That looks like a Preston Light Ranger.  It essentially works by making a bunch of different measurements, stacked horizontally across the screen.  That way a focus puller can choose a focus distance based on the most relevant measurement.

https://www.fdtimes.com/2017/01/17/the-gods-of-focus-speak-lr2/

Edited May 21 by Gabriel Elder

[Vince Sweeney 3]

Thanks. Very cool.