This item is displayed only with lenses that support it. Selecting Enable allows the lens focus ring to be used for manual focus when the camera is in autofocus mode. After pressing the shutter-release button halfway to focus, keep the button pressed halfway and adjust focus using the focus ring. To refocus using autofocus, lift your finger from the shutter-release button and then press it halfway again. To prevent the lens focus ring being used for manual focus when the camera is in autofocus mode, select Disable.