Sony a7SIII Help Manual page 115

Subjects in the focusing area with different focal distances
Hint
In [Continuous AF] mode, you can lock the focus by pressing and holding the button that has been assigned the [Focus Hold]
function.
When you set the focus to infinity in [Manual Focus] mode or [DMF] mode, make sure that the focus is on a sufficiently distant
subject by checking the monitor or the viewfinder.
Note
[Automatic AF] is available only when you are using a lens that supports phase detection AF.
When [Continuous AF] or [Automatic AF] is set, the angle of view may change little by little while focusing. This does not affect
the actual recorded images.
Only [Continuous AF] and [Manual Focus] are available when shooting movies or when the mode dial is set to
Motion).
Related Topic
Direct manual focus (DMF)
Manual Focus
Selecting the focus area (Focus Area)
Assigning frequently used functions to buttons (Custom Key Setting)
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