Samsung ER-GX1LZBAA - Manual (Page 121)

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Focusing
ƈ You can set the camera so that the focusing is not performed
when the shutter release button is pressed halfway and is
performed when the button is pressed.
This is useful when you wish to temporarily use autofocus while
using manual focus.
Set [Enable AF] in [OK btn when shooting] in the [ Custom
Setting] menu.
Use the Button to Focus on the Subject
ƃ Only use this function with lenses that are compatible with Quick Shift Focus.
ƃ Select [Cancel AF]. appears in the viewfinder while the button is pressed. Autofocus does
not activate when the shutter release button is pressed. This is useful when you wish to
temporarily use manual focus while using autofocus.
ƃ You can focus using the focus ring and release the shutter while OK button is pressed when using
a lens compatible with Quick Shift Focus. (Let go of the OK button to immediately return to AF
mode.)
INFORMATION
OK btn when shooting
Off
Spot AF
Enable AF
Cancel AF
AF with shutter release
button disabled so AF
performed with OK button