The self-timer is a camera function that delays the firing of the shutter for a set number of seconds after you press the release, most commonly two or ten seconds. It is one of the oldest camera features, originally created so the photographer could press the button and then run into the frame for a self-portrait or group photo before the shutter speed exposure was made.
That original purpose still holds. The ten-second delay gives you time to join a group shot or set up a self-portrait, and many cameras can be combined with face or eye detection so focus locks on you once you are in position. Phone cameras inherited the feature directly, where it remains the standard way to take a steady photo without anyone holding the device.
The second major use is preventing vibration. When a camera is locked on a tripod, the simple act of pressing the shutter button transmits a small shake that can soften a long exposure. Setting a two-second self-timer lets that vibration die away before the shutter actually opens, which makes the timer a free substitute for a remote release. This matters in long exposure photography, macro work, and any sharp tripod shot, and it directly reduces camera shake.
For the steadiest possible results on a DSLR, photographers combine the self-timer with mirror lockup, so the mirror flips up first and its vibration settles during the timer countdown before the exposure begins. Some cameras streamline this into a single delayed mode that handles both in one press.
Many cameras also offer a self-timer variant that fires a short burst of frames after the delay, which is invaluable for group shots where someone always blinks, since it gives several frames to choose from. Custom modes let you set the delay length and the number of shots, and a few cameras even let the timer feed into interval shooting.
For exposures longer than the camera’s timed range, or for repeated interval shooting, photographers move from the self-timer to a wireless remote, a phone app, bulb mode, or an intervalometer, all of which trigger the shutter without touching the camera at all. But for everyday steadiness, self-portraits, and getting yourself into the family photo, the built-in timer remains one of the most quietly useful controls on any camera.
One small habit makes the timer more reliable: lock focus before it counts down, or use a mode that focuses at the moment of capture, so a subject who moves into the frame still lands sharp. For tripod work, the two-second setting paired with an electronic first-curtain shutter is the simplest route to a vibration-free frame without buying any accessories. Almost every camera keeps the timer one button press away, so it is worth learning where yours lives before you need it in a hurry.