Nikon D3100 - Manual (Page 42)

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Step 4: Focus
1
Press the shutter-release button halfway.
Press the shutter-release button halfway to
focus. The camera will select the focus points
automatically. If the subject is poorly lit, the flash
may pop up and the AF-assist illuminator may
light.
2
Check the indicators in the viewfinder.
When the focus operation is complete, the
selected focus points will be briefly highlighted,
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.
While the shutter-release button is pressed halfway, the number of exposures
that can be stored in the memory buffer (“
t”; 0 53) will be displayed in the
viewfinder.
Step 5: Shoot
Smoothly press the shutter-release button the rest of
the way down to release the shutter and record the
photograph. The access lamp next to the memory
card slot cover will light and the photograph will be
displayed in the monitor for a few seconds (the photo
will automatically clear from the display when the
shutter-release button is pressed halfway). Do not
eject the memory card or remove or disconnect the
power source until the lamp has gone out and recording
is complete.
In-focus indicator Description
I Subject in focus.
I (blinks)
Camera unable to focus using
autofocus. See page 56.
In-focus
indicator Buffer
capacity
Access lamp