HP 318 - Manual (Page 18)

HP photosmart 318 User Guide 10
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Using automatic focus and
automatic exposure
The camera automatically focuses and adjusts the exposure for
the current lighting conditions when you press the
SHUTTER button
halfway down.
The camera adjusts the focus and exposure automatically even if
you press the
SHUTTER button all the way down without pausing.
But you are more likely to catch the perfect shot, especially when
you are photographing an active subject, if you set the camera’s
focus and exposure early. To do this, press the
SHUTTER button
halfway down, and then press the SHUTTER button all the way
down at the exact moment you wish to capture the image.
Note If the camera cannot find a focus or if the exposure
will be longer than 1/30 second, a yellow light
appears to the right of the viewfinder. You can still
take the picture, but the results might not be optimal.
Using focus lock
The automatic focus feature focuses on the subject in the middle
of the picture and requires good contrast within that subject area.
If you do not want your subject to be in the middle of the image or
if the subject lacks contrast, use focus lock.