Unfortunately, auto focus seeks the brightest object in the frame to focus on, or the object closest to you. So if you're video taping a singer, and the lights are reflecting off the cymbals in the background, the auto focus may continually throw the singer out of focus as it tries to focus on the bright reflection.
Sudden movement can effect the auto focus mechanism similarly.
Focus Tip -- Lets assume you are at the back of an auditorium, video taping a singer and some performers. With your camera on a tripod, select "Manual" focus. Now zoom in as tightly as possible on the stage. Select an object on the stage and focus on it carefully. You should now be able to zoom in and out freely, and the camera will remain in focus throughout the zoom. If you change the position of the tripod, you will have to repeat this procedure.
Last modified 12/14/00