A picture is said to be in focus when it appears sharp. A lens has a ring for controlling focus, with numbers on the ring that give distance in feet and meters. When something is in focus, it looks sharp and clear; when it is out of focus, it appears fuzzy and ill defined. To focus the zoom lens properly, zoom in all the way, turn the focus ring until a sharp picture is obtained, and then zoom out to frame the shot. This focusing technique allows zooming in or out during the shot without losing focus on the subject. Some camera lenses also come with a back focus ¬which should be adjusted only by a qualified camera technician-and some others with an auto-focus mode.
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