HP 315 - Manual (Page 21)

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4. Press and hold the shutter button 1/2 way down to allow the camera to adjust the focus
and exposure.
Note: If you move the camera and frame a different subject while keeping the shutter
button pressed 1/2 way down, the camera does not re-adjust the focus and
exposure. If you decide to take a different photo, release the
shutter button
and start over so that the camera can adjust focus and exposure for the new
subject.
5. When you see the steady green light to the right of the viewfinder, press the shutter
button all the way down to take the photo. Wait for the beeps, indicating your photo has
been taken, then release the
shutter button.
When you are finished using the image LCD to frame your photos, you can close the
lens cover to turn the camera off, or press the
image LCD on/off button to turn only the
image LCD off.