A clapperboard (also known by various other names including dumb slate) is a device used in filmmaking and video production to assist in synchronizing of picture and sound, and to designate and mark the various scenes and takes as they are filmed and audio-recorded.

How do you use a clapperboard?

Stand where the Camera Op tells you your slate is both in the frame and in focus. If the camera has to refocus, it will just take up more time. When both the camera and sound are “speeding” you call out the scene number and take number, then “Mark!” and clap the sticks together. Then get out of the frame immediately.

Do I need a clapperboard?

So do I need to use a clapperboard? It is best practice to use one on every shoot, but it is up to you. If you're shooting with on-camera mics you may feel less of a need for one. When using an external editor or recording separate audio, it is highly advisable.