Ben_B
Veteran
Kind of like putting hard stops on a professional follow focus. I get what you're saying. Here's the thing, most DPs and operators aren't going to have (nor should they) patience for a 1st who is programming stops into the camera during blocking. That would get you streamlined on the first set-up.
This is how you do it. DP and operator spec the set up. ACs build the rig to that spec. Director, DP and other dept. heads block the scene with camera, talent and other necessary departments. During blocking, 1st AC sets talent marks (and any additional focus marks) on the floor with tape or natural marks whenever possible. 1st AC marks follow focus disc accordingly. More complicated set ups rehearse a few times, crew practices moves and gets ready for picture.
Nowhere in that formula is there room to be programming auto-focus during this tried and tested technique for filming narrative scenes. For anything more than one fixed rack focus (which you should be able to accomplish manually in fractions of a second), will programming the camera work. Simply won't.
If you want Panasonic to waste space and boards and time setting up AF programming, so be it. I'm just telling you how narrative filmmaking works in the real world. And AF is nowhere to be found.
On House when they were using the 5D they had motorized follow focuses geared to the lenses that went to another area where they had an AC pulling focus remotely looking at a monitor...I am just thinking that if there was a way to utilize the motor already built into the lens they wouldn't need to setup the motorized follow focus and waste time when swapping lenses.