Gotcha ... I think you do need an auto focus system then. Dual Pixel with a bunch of crossover points might/should/ought to help.Ha, ha. My challenge is usually DPs, Directors and Actors on film and television sets doing stand ups, not in sit down interviews...
Off Red Rock's site -Very cool link, thank you, I enjoyed watching that. I wonder what that entire system costs though? About as much as a C300?
The sonar rangefinder is $795 (U-Boats beware).
The handheld microremote is $1,590 (+ accessories like cables and lens gears), the wireless is $2,485.
So, off that video, with the operator controlling the system on his gimbal, it's about $2,500, give or take a few bucks.