Panasonic LUMIX DC-GH6 Owner's Manual page 432

Special Video Recording – Log Recording
•
Latitude becomes "13+ Stop" when [Dynamic Range Boost] is set to [ON] and
becomes "12+ Stop" when set to [OFF].
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Luminance can be checked by "Stop" units:
( [Luminance Spot Meter]: 406, [Zebra Pattern]:
432
408)