What's the difference/advantage between setting knob limits or motor limits on a wireless follow focus?

[davide sorasio]

What's the difference/advantage between setting knob limits or motor limits on a wireless follow focus? Maybe it's a silly question but I cannot figure out the difference, the WCU4 gives u the option to set motor limits or knob limits.

[Tyler Purcell]

Limits are for lenses that don't have repeatable focus, like modern still DSLR glass.

 

If you use real cinema glass, you don't really need limits.

 

On remote/wireless follow focus, they automatically calibrate to the lens to find the two furthest points. This way you know where your at when pulling remotely in relationship to the glass.