When the camera is mounted on a tripod or other camera support, using the self-timer correctly prevents camera movement. The self-timer can be used when taking photos of a group or scene, a self-portrait or close-up shots. It is also very useful when taking photos in low light without a flash, for long exposures and for taking panoramic shots.
Press the shutter button correctly when using the self-timer
You must press the shutter-release button in two steps even when using the timer. First depress the shutter button halfway to lock focus and exposure. Check the scene or subject in the viewfinder or the LCD, then fully depress the shutter-release button to trigger the timer. As you move your hands away, don’t nudge the camera from its set position.
Many digital cameras let you select the time it takes for the self-timer to release the shutter, usually between two and 10 seconds. Some models have a custom self-timer, which lets you set the countdown time and the number of shots to be taken.
Digital cameras with Self-Portrait Timers use Face Detection technology to recognize when your face when it enters the frame. Afer a couple of seconds, it then snaps the shutter. Some self-portrait timers can be set to detect a specified number of faces.