What the thread found

• A follow focus motor can chatter and search repeatedly when the calibration knobs are positioned at or near their extreme end positions, which may indicate a worn calibration potentiometer.
• Moving the calibration knobs slightly away from their end stops can help determine if potentiometer wear is the cause of chattering behavior.
• Insufficient power to the follow focus receiver can produce chattering symptoms, which may be accompanied by the status light changing colors instead of remaining steady green.
• RF interference in certain locations can cause a follow focus motor to chatter and malfunction, but the system works normally in RF-clean environments.
• Chattering can occur both when the motor is in contact with a lens and when operating independently with rollers at extreme positions.

Depends on

• One user reported the issue resolved by changing location, suggesting environmental RF interference rather than a definitive equipment failure.
• The potentiometer wear diagnosis was suggested but not confirmed in this specific thread.
• Power supply issues were mentioned as a possibility but not fully diagnosed in the reported case.

Gear in this thread

BFD

Parts

Follow Focus

Same gear or parts

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