Samsung A12 Manual De Usuario

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[Focus Ring Settings] (Setup Tab)
In [Focus Ring Settings], you can set either a mode that enables functions 
for both autofocus and manual focus or a mode that enables functions for 
manual focus only.
When [AF + MF] is selected, after the shutter button is pressed down 
halfway to set the focus, the focus can be fine tuned by turning the focus 
ring.
Item
AF + MF
MF Only
 Note --------------------------------------------------------------------------------------
If the shutter button is re-pressed after fine tuning, autofocus will activate 
and fine adjustment will be cancelled.