DZOfilm lenses - How to add SHIMs and back-focus (Canon C300 Mark iii - and others)

A little more information on how to add shims for an EF mount when using DZOfilm Lenses. Download a star chart: Essentially you use the moiré (look like arrows or stars) to help achieve perfect focus. Shot on: Canon xf705 Canon c300 mk iii & DZOfilm 20-55mm