Sony a7 III Mode D'emploi page 37

Direct manual focus (DMF)
You can make fine adjustments manually after performing auto focusing,
letting you focus on a subject more quickly than when using the manual
focus from the beginning. This is convenient in situations such as macro
shooting.
1
MENU 
2
Press the shutter button halfway down to focus automatically.
3
Keep the shutter button
pressed halfway down, and
then rotate the focusing ring
to achieve a sharper focus.
• When you rotate the focusing
ring, the focus distance is
displayed on the screen. The
focus distance is not displayed
when the Mount Adaptor
(sold separately) is attached.
4
Press the shutter button fully down to shoot an image.
(Camera Settings 1)  [Focus Mode]  [DMF].
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