What the thread found

• A Fox wireless follow focus unit paired with an FMG-6 motor may lose its calibration marks shortly after setup and eventually shift the focus position to one end of the lens range.
• Powering off both the receiver and hand transmitter unit for approximately ten minutes, then restarting and recalibrating may resolve calibration loss issues.
• Fox follow focus systems are known to require more careful handling and maintenance compared to other brands.
• The potentiometer in the motor may degrade over time and cause focus tracking problems.
• Testing a motor potentiometer with a multimeter is not a reliable diagnostic approach for this type of malfunction.

Depends on

• No root cause was definitively established for the reported calibration loss.
• Advice about power cycling was not confirmed to have solved the original problem.
• The suggestion about potentiometer failure was speculative and not verified.
• This information pertains specifically to Fox brand follow focus systems with FMG-6 motors.

Parts

Follow Focus

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