Tail Slate
A clapperboard slated at the end of a take, held upside down to signal the sync mark is at the tail.
Tail Slate
noun | Production
A clapperboard presented and clapped at the end of a take rather than the beginning, used when it is not practical to slate before the performance starts. The 2nd AC holds the slate upside down during a tail slate to visually signal to the editor and sound editor that the sync point - the clap of the sticks - occurs at the end of the shot rather than the beginning. This prevents confusion in post-production when the editor locates the sync mark and needs to know which end of the shot it belongs to.
Quick Reference
| Domain | Production |
| Also Called | End slate, tail sticks |
| Position | End of the take, after the director calls "Cut" |
| Orientation | Upside down (sticks at the bottom) |
| Vocal Cue | "Tail slate" or "Tail sticks" called by the 2nd AC |
| Purpose | Sync point when front slate is impractical |
| Related Terms | Slate, Clapperboard, Take, Continuity, Action |
| See Also (Tools) | Shot List Generator |
| Difficulty | Intermediate |
The Explanation: How & Why
The clapperboard serves two functions: it provides a visual record of the scene, take, camera, and roll number, and it provides a sync point - the sharp visual and acoustic event of the sticks clapping together that allows the editor to align the picture and sound tracks in post-production. In standard production, the slate is presented at the beginning of each take, before "Action" is called.
There are specific situations where slating at the beginning of a take is impractical:
Performance-sensitive situations: Some scenes require performers to be in a specific emotional state before the camera rolls. A director may ask for the camera to start rolling while the actor is already mid-emotion. Slating at the front - with the 2nd AC stepping into frame, calling the scene and take number, and clapping - would interrupt or destroy that state. The director calls "Action" immediately after rolling, and the slate is done at the tail.
Specific camera positions: Some shot setups make front slating impossible. A very tight close-up where the slate would take too long to clear from frame. A camera position that the 2nd AC cannot safely or quickly reach before "Action" is called. A specialty rig where the camera is positioned in a space too small for normal slating.
Improvised or reactive shooting: Documentary-style narrative shooting or genuine documentary work may require the camera to start rolling before a slate is practical, capturing a spontaneous moment that cannot wait.
After the director calls "Cut," the 2nd AC steps into frame at the end of the take holding the slate upside down. They call out "Tail slate" (or "Tail sticks") audibly on the recording so the sound editor can locate the moment. They then clap the sticks - the sync point - and step out of frame. The upside-down orientation is the universal visual signal: when the editor sees an upside-down slate at the end of a shot, they know the sync point is here rather than at the head. For a detailed guide to slating procedure including tail slates, see StudioBinder's clapperboard guide.
An MOS shot (shot without sound) may still receive a tail slate. In this case, the slate is presented but the sticks are not clapped, since there is no audio to sync. Some productions mark MOS slates with a finger between the sticks before they are opened, indicating "no sound."
Historical Context & Origin
The tail slate practice developed alongside the synchronized sound era beginning in the late 1920s. Once sound and picture had to be synchronized in post-production, a consistent slate protocol became essential. The front slate became standard because it allows the editor to identify and sync each take from the first frame of usable material. The tail slate developed as the accepted alternative for situations where front slating is impossible, with the upside-down orientation as its universal visual identifier.
The clapperboard itself is attributed to Australian filmmaker F. W. Thring, and the device has been a fixture of film sets since the early sound era. The convention of the upside-down tail slate is consistent across all professional productions worldwide and has remained unchanged through the transition from film to digital. Even with modern timecode slates like the Denecke TS-3, which display SMPTE/EBU timecode on an LED panel, the upside-down orientation for tail slates remains the standard visual signal. For a historical overview of the clapperboard, see the Wikipedia article on clapperboards.
How It's Used in Practice
Scenario 1 - Emotional Performance (Director / 2nd AC): A director is shooting a scene where an actor must begin in tears. Any pause for a front slate would break the performance state. The director calls "Roll camera, roll sound" and then immediately calls "Action." After the performance concludes and the director calls "Cut," the 2nd AC steps in with the inverted slate for the tail. The actor can remain in their emotional space throughout without interruption. The script supervisor notes "TS" (tail slate) on the script supervisor's report for this take.
Scenario 2 - Tight Camera Position (1st AC / 2nd AC): A close-up on an ARRI ALEXA 35 with a 100mm Master Prime is framed so tightly that clearing the slate from the frame would require the 2nd AC to step back several feet and take several seconds. The 1st AC decides to go with a tail slate: the camera rolls, "Action" is called immediately, and the slate follows at the cut. The 2nd AC calls "Tail slate, scene 42, take 3" and claps the inverted board.
Scenario 3 - Editor Identification (Editor): An editor in post-production using Avid Media Composer encounters a shot that begins without a slate. Scrolling forward, they find an upside-down slate at the end of the take with the scene, take, and camera information clearly visible. The audible "Tail slate" call on the soundtrack confirms the sync point. The editor aligns the clap mark with the audio spike, flips the take to read the slate information correctly, and proceeds with the cut.
Usage Examples in Sentences
"Going straight to action - we will tail slate it. Emotions first."
"Tail sticks, scene 42, take 3." The 2nd AC claps the inverted board at the end of the shot.
"If the editor sees an upside-down slate at the end of a shot, they know to look for the sync there, not at the head."
"MOS tail slate - no sticks, just the board for identification."
Common Confusions & Misuse
Tail Slate vs. Front Slate: A front slate is clapped at the beginning of the take before "Action" is called. A tail slate is clapped at the end after "Cut" is called. The upside-down orientation of the tail slate is what distinguishes it visually from a normal front slate. Without that inversion, an editor might mistake the tail slate for the front slate of the following shot.
Tail Slate vs. MOS: MOS refers to shooting without sound. The sticks may still be clapped on an MOS front slate (providing a visual-only sync reference), but more commonly the sticks are held closed or a finger is placed between them to indicate no audio sync is required. A tail slate can be either with sound (normal sync) or without (MOS identification only). The key distinction: MOS is about whether sound is recorded. Tail slate is about when the slate occurs in the take.
Forgetting the verbal call: A common mistake on set is performing the tail slate without calling "Tail slate" audibly on the recording. Without the verbal call, the sound editor may not realize the sync point is at the tail. Always call out "Tail slate" or "Tail sticks" before clapping.
Variations by Context
| Context | How Tail Slate Varies |
|---|---|
| Digital Timecode Slates | With a Denecke TS-3 or similar timecode slate, the timecode display freezes at the clap moment. The upside-down orientation still applies. The timecode display provides an additional sync reference beyond the visual clap. |
| Multi-Camera | When slating for multiple cameras, the 2nd AC claps the sticks for each camera (A, B, C) in order. For a tail slate, all cameras must remain rolling until all sticks are clapped. |
| MOS Shots | On an MOS tail slate, the sticks are not clapped. The slate is held upside down for identification only. A finger between the sticks indicates "no sound." |
| Documentary | In documentary or run-and-gun shooting, tail slates are common because the camera often starts rolling before a slate can be prepared. The convention is the same: upside down, verbal call, clap. |
| UK vs. US Terminology | UK productions use the same upside-down convention but may call it "end slate" rather than "tail slate." The procedure is identical. |
Key People & Films
The tail slate convention has been used since the early sound era and is universal across all professional productions. F. W. Thring, the Australian filmmaker credited with inventing the clapperboard, established the device that made both front and tail slating possible. The procedure is documented in the MasterClass guide to using a clapperboard, which outlines the standard slating protocol including tail slates. Every working 2nd AC in the industry performs tail slates as part of their standard duties. The procedure appears in behind-the-scenes footage from virtually every professional film and television production, though it is rarely highlighted because it is considered a routine camera department operation.
Equipment / Tools Reference
The Denecke TS-3 timecode slate is the most widely used smart slate on professional productions, reading and displaying SMPTE/EBU timecode with an internally mounted SB-2 Syncbox Time Code Generator. It jams to all standard frame rates including 23.976 fps and features a TCXO crystal with +/-1ppm stability. The Denecke TS-3ELC adds an electro-luminescent backlit display for night shoots and dimly lit stages. Traditional dumb slates (wooden sticks on an acrylic or whiteboard base) are still used on many productions and cost significantly less than timecode slates. The ARRI ALEXA 35 and Sony VENICE 2 cameras both accept timecode input from the slate via LEMO or BNC cables, allowing jam sync from the slate's internal generator. Avid Media Composer and Adobe Premiere Pro both provide tools for aligning audio and picture using the visual clap reference from tail slates.
Standards & Specifications
The tail slate procedure follows SMPTE timecode standards for synchronized sound recording. The Denecke TS-3 and similar timecode slates read and display SMPTE/EBU timecode, which is the standard for film and video production worldwide. The SMPTE 12M standard defines the timecode format that appears on the slate's LED display. For productions shooting at 23.976 fps (the standard for theatrical release in NTSC regions), the timecode slate must be jammed to the correct frame rate before slating begins. The upside-down orientation for tail slates is not defined by a formal standard but is a universal industry convention that has been consistent since the sound era. IATSE Local 600 (International Cinematographers Guild) training materials include tail slate procedure as part of the 2nd AC's standard skill set.
Common Questions / FAQ
Q: Why is the slate held upside down for a tail slate?
A: The upside-down orientation is the universal visual signal to the editor that the sync point - the clap of the sticks - occurs at the end of the shot rather than the beginning. Without this signal, an editor reviewing footage might mistake the tail slate for the front slate of the following shot, causing sync confusion.
Q: Do you clap the sticks on an MOS tail slate?
A: No. On an MOS shot (shot without sound), there is no audio track to sync. The slate is presented upside down for visual identification only, and the sticks are not clapped. Some productions place a finger between the sticks to indicate "no sound" before presenting the slate.
Q: Who is responsible for performing the tail slate?
A: The 2nd Assistant Camera (2nd AC, also called the clapper/loader) is responsible for all slating, including tail slates. The 1st AC may perform the slate if the 2nd AC is unavailable, but it is fundamentally a 2nd AC responsibility. The 2nd AC must call "Tail slate" audibly before clapping, so the sound recordist and editor know to expect the sync point at the tail.
Related Terms
- Slate - The standard front slate that the tail slate replaces when front slating is impractical
- Clapperboard - The physical device used for both front and tail slates; its sticks provide the clap that serves as the sync point
- Take - The recorded unit of performance at the end of which the tail slate appears
- Continuity - Tail slates are part of the continuity record; their information matches the camera report and sound report for each take
- Action - The cue that is called immediately after rolling on a tail-slated take, without the standard pause for front slating
- 2nd AC - The camera department role responsible for operating the clapperboard and performing all slating procedures
See Also / Tools
The Shot List Generator is relevant to tail slate planning. Noting on the shot list which setups are likely to require tail slates (emotional performance shots, tight close-ups, specialty rigs) helps the 2nd AC anticipate and prepare for the modified slating protocol before each setup. For a comprehensive guide to on-set slating procedure, see the StudioBinder clapperboard guide.
