LG D959 - Manual (Page 80)

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Zoom to Track
When you play a video, you can enlarge an object while tracking it.
1 When you play a video, tap .
2 Touch the magnifying glass and drag it to the object to track.
NOTE:
• Do not press too hard; the touch screen is sensitive enough to pick up a
light, but firm tap.
• Zoom to Track may not be available if the object moves too fast or off
from the screen.