Sony ILCE-1 Help Manual page 123

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
When [Continuous AF] is set, the angle of view may change little by little while focusing. This does not affect the actual recorded
images.
Even if the focus mode dial is set to AF-S or DMF, the focus mode will switch to [Continuous AF] when shooting movies or when
the mode dial is set to
Related Topic
Using the focus mode dial
Direct manual focus (DMF)
Manual Focus
Selecting the focus area (Focus Area)
Assigning frequently used functions to buttons (Custom Key Setting)
(S&Q Motion).
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