Sony A7RIII ILCE-7RM3A Operating Instructions Manual page 596

Help Guide
Interchangeable Lens Digital Camera
ILCE-7RM3A
α7RIII
Video Light Mode
Sets the illumination setting for the HVL-LBPC LED light (sold separately).
MENU → (Camera Settings2) → [Video Light Mode] → desired setting.
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Menu item details
Power Link:
The video light turns on/off in sync with the ON/OFF operation of this camera.
REC Link:
The video light turns on/off in sync with movie recording start/stop.
REC Link&STBY:
The video light turns on when movie recording starts and dims when not recording (STBY).
Auto:
The video light automatically turns on when it is dark.
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