Focal Distance, Focal Length and Focal Aperture only work with the Post Processing Stack (image effects provided by Unity), since they affect depth of field properties.
You have to please download Post Processing Stack asset from the Asset Store and then in the Slate preferences, check the “Enable Post Processing Stack Define”. You will of course also need to property set up a Post Processing Stack image effect with Depth Of Field enabled on the “Render Camera” as well since that is the camera all custscenes are rendered from.
Gavalakis
