A motion control rig is a computer-controlled camera mount system that records and replays precise, programmable camera movements with exact repeatability. Unlike human-operated camera rigs, a motion control system mechanizes every axis of camera movement, including pan, tilt, roll, lateral position, and focal length, allowing a specific camera path to be executed identically on multiple passes, enabling visual effects techniques that require perfect frame-to-frame alignment between separate shoots.

The core capability of motion control is repeatability: once a move is programmed, the rig will execute it with millimeter and sub-degree precision on every subsequent pass. This makes motion control essential for in-camera compositing, where foreground elements and background elements are shot separately and must align exactly for the composite to work convincingly, and for miniature photography, where scaling a camera move to match the scale of a miniature requires precise speed control that human operators cannot achieve. Motion control is also used in product photography and advertising to create perfectly identical camera paths for multiple product variants or to enable clean plate and difference matte compositing. Modern motion control systems are computer-driven and can interpolate between keyframe positions smoothly, and they have become more compact and affordable, making them accessible to a wider range of productions. The technique was pioneered in the late 1970s for productions requiring complex space battle sequences and became foundational to high-end visual effects work.

In AI video generation, the concept of motion control is relevant to the precision and repeatability of generated camera paths. Some advanced generation platforms allow programmatic specification of camera movement keyframes, bringing a degree of motion-control-like precision to AI-generated cinematography rather than relying entirely on the model's interpretation of a text description.