Nikon D3000 User Manual (en)

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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, 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 39) will be displayed in the 
viewfinder.
A
Using a Zoom Lens
Use the zoom ring to zoom in on the subject so that it fills a 
larger area of the frame, or zoom out to increase the area 
visible in the final photograph (select longer focal lengths 
on the lens focal length scale index to zoom in, shorter focal 
lengths to zoom out).
In-focus indicator
Description
I
Subject in focus.
I (blinks)
Camera unable to focus using 
autofocus. See page 34.
Zoom in
Zoom out
Zoom ring
In-focus 
indicator
Buffer 
capacity