Sony a7SIII Help Manual page 404

Note
RAW movies cannot be recorded on the memory card of the camera.
During slow-motion/quick-motion shooting, [Rec. Media dur HDMI Output] is locked to [On] and [RAW Output] is locked to [Off]. It
is not possible to only output 4K movies to a device connected via HDMI without recording the movies on a memory card. It is
also not possible to output RAW movies.
When [Rec. Media dur HDMI Output] is set to [Off(HDMI Only)] or the camera outputs RAW movies, [HDMI Info. Display]
becomes temporarily set to [Off].
When [Rec. Media dur HDMI Output] is set to [Off(HDMI Only)], the counter does not move forward (the actual recording time is
not counted) while the movie is being recorded on an external recorder/player.
[REC Control] can be used with external recorders/players that support the [REC Control] function.
When [Time Code Output] is set to [Off], you cannot set [REC Control].
Even when (REC) is displayed, the external recorder/player may not work properly depending on the settings or status of
the recorder/player. Check if the external recorder/player works properly before use.
When [Time Code Output] is set to [On], images may not be output properly to the TV or recording device. In this case, set [Time
Code Output] to [Off].
It is not possible to output audio in 4 channels to other devices connected via HDMI.
The gamma is locked to S-Log3 during RAW output. You can reproduce contrast equivalent to that of the normal gamma by
setting [Gamma Display Assist] to [On] and [Gamma Disp. Assist Typ.] to [Auto] or [S-Log3→709(800%)].
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