Nikon D3400 Reference Manual page 59

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4
Press the shutter-release
button halfway.
Viewfinder photography: Press
the shutter-release button
halfway to focus (if the
subject is poorly lit, the flash
may pop up and the AF-
assist illuminator may light).
When the focus operation is complete, a beep will sound (a
beep may not sound if the subject is moving) and the in-focus
indicator (I) will appear in the viewfinder.
In-focus indicator
I
I
(flashes)
Live view: The focus point flashes green
while the camera focuses. If the
camera is able to focus, the focus
point will be displayed in green;
otherwise, the focus point will flash
red.
Subject in focus.
Camera unable to focus using autofocus. See
page 72.
In-focus indicator
Description
Basic Photography and Playback
35

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