Director's or 1st AD's command to start camera and sound recording immediately. Everything after is a take.
The command "Roll it" is the starting gun for every take — the moment when material actually flows into the memory card. As soon as these words are spoken, the camera is rolling, and sound is recording. There's no going back, no more rehearsal. The 1st AD or the director gives this command after all positions have been checked: actors in place, lighting stable, sound ready, camera focused. Anyone still walking around or adjusting equipment beforehand disqualifies themselves from the take.
In practice, it works like this: The director gives the signal. The 1st AD or a designated assistant calls out "Roll it" loud and clear. The focus puller confirms the focus is set. The sound mixer nods. Only then does the director call "Action." Often, there's a second of silence in between — this buffer zone is important so the camera reaches its operating speed and the sound is stabilized. With digital cameras, this happens lightning fast, but the routine remains: confirmation before performance. With analog 35mm, however, real seconds pass between "Roll it" and usable recording — here, the command is a true waiting order, not a simultaneous process.
The biggest mistake of inexperienced directors: saying "Roll it" and "Action" in the same breath. This leads to lost takes because the camera isn't delivering stable images yet, or the sound hasn't reached the correct level. The "Cut" at the end must also be clearly commanded — only then is it truly over. What happens afterward is again material that can be visible in the edit if the camera is still rolling.
On set, you'll hear this call dozens of times a day. It marks the psychological transition: from preparation to performance. Actors feel it immediately — their body tension changes. Therefore, adhering to this rule is not only technically sensible but also a mental boundary between rehearsal and take. Those who disregard it lose continuity and trust in the recording process.