Sony A7RIII ILCE-7RM3A Operating Instructions Manual page 171

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
Related Topic
Direct manual focus (DMF)
Manual Focus
MF Assist (still image)
Phase detection AF
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