Samsung EV-NX300MBSTUS - Manual (Page 83)

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Shooting Functions >
AF mode
Manual focus
You can manually focus on a subject by rotating the focus ring on the
lens. The MF Assist function lets you easily achieve a focus. While you are
rotating the focus ring, the focus area is magnified. When you use the
Focus Peaking function, the color you selected appears on the focused
subject. This mode is recommended for shooting an object similar in color
to the background, a night scene, or fireworks.
If you use this function, you cannot set Touch AF, AF Area, and Link AE to AF
Point options.