Cinema Labs AutoFocus 3 channel automatic follow focus system capabilities and limitations

2014General Discussion forum

12 years old. Gear and prices may have changed since.

DisputedParticipants disagreed and reached no conclusion. Read the findings as positions, not as an answer.

The system uses RFID tags or transponders attached to subjects to track distance and maintain focus automatically
Automatic focus systems measure distance to the tag location rather than to the specific feature needing sharpness, creating problems when actors move or change body position relative to the camera
The manufacturer claimed the system would deliver 100% in-focus frames and stated it performs predefined focus racks at fixed speeds without variation
Manual focus pulling allows operators to apply timing judgment and shapening to focus movements in response to performance and music, qualities that automated systems cannot replicate
Automated systems may assist with maintaining single-subject focus but cannot replace skilled operators for transitions between multiple subjects or scenes requiring artistic focus choices
Focus pulling difficulties under challenging conditions like extreme wide apertures with long lenses and moving subjects represent scenarios where supplementary automation might theoretically help
System reliability and ease of use would be critical factors for professional adoption, as automated failures on set would be career-ending problems

The thread contains secondhand accounts from sales calls rather than hands-on testing
Marketing materials showed tracking demonstrations on small objects too small for the described transponder size, raising questions about actual capabilities
No technical specifications provided regarding motor mechanics, sensor placement, or system response times
Discussion remained theoretical without anyone reporting actual production use
The exact technical approach described in the system's marketing was inconsistent across different people's accounts of sales conversations