Clapperboard displaying scene and take info, filmed at the top of each take to sync picture and sound in post.
Technical Details
Professional film slates consist of two boards: the upper movable "sticks" (2-3 cm thick) and the lower board with a black or white surface. Standard fields include Scene, Take, Roll, Date, Cameraman, and Production Title. Digital Smart-Slates integrate LED displays with timecode generators that synchronize precisely to 1/100th of a second. Electronic variants transmit synchronization signals directly to audio recording devices via radio or cable. Special versions for underwater filming use waterproof housings and reinforced hinges.
History & Development
The first documented use of a film slate occurred in 1929 at Bell Telephone Laboratories for early sound film experiments. Engineer Frank B. Jewett developed the system to solve the synchronization problem between separate picture and sound recordings. In 1930, the slate became an industry standard in Hollywood. The digital revolution brought the first Smart-Slate from Ambient Recording in 1992 with an integrated timecode display. Modern RFID slates have been automatically transferring metadata into digital workflows since 2018.
Practical Use in Film
For "Dunkirk" (2017), Christopher Nolan used waterproof special slates for underwater sequences with divers. Multi-camera productions like "The Avengers" (2012) rely on wirelessly synchronized Smart-Slates for up to 15 cameras running simultaneously. The "Academy Color Encoding System" reference colors on modern slates enable precise color correction in post-production. Silent slates (soft sticks) with foam buffers are used in intimate dialogue scenes to avoid breaking an actor's concentration.
Comparison & Alternatives
Hand claps replace slates in spontaneous documentary shoots but do not provide visual production data. Automatic sync software like PluralEyes reduces reliance on mechanical slates through audio analysis. Timecode jam-sync synchronizes cameras and sound devices electronically without a slate clap. Smart-Slates combine both methods: mechanical backup synchronization and digital metadata transfer. In live broadcasts, the slate is completely omitted in favor of Genlock systems for real-time image synchronization.