3D specialist who calibrates interaxial distance, convergence, and stereo window pre-shoot — prevents eye strain and audience discomfort. Bridges technical setup and creative intent.
Stereographer
The stereographer works in front of the camera—not behind it. While the cinematographer thinks about composition in 2D space, the stereographer calculates the spatial depth for both of the viewer's eyes. This is fundamentally a technical specialty, but it becomes immediately creative as soon as you realize that incorrect 3D parameters can make an entire scene unbearable.
The core task: calibrate the interaxial distance—the distance between the left and right lenses. Too close together? The 3D effect falls flat. Too far apart? The eye protests after twenty minutes. The stereographer measures this before shooting begins, documents it for each shot, and collaborates with the DoP to ensure that the depth staging supports the story, rather than distracting from it. This becomes critical with extreme wide-angle shots or close-ups—here, the stereographer decides together with the director on the stereo window, i.e., the plane on which the eyes converge comfortably.
Convergence is the second major area: Where do the optical axes of the two cameras intersect? If this point is in front of the action, it appears to be pushed out towards the viewer—it can feel oppressive. If it's behind, the scene draws the viewer in. The stereographer calculates this, sets markers for the focus puller and VFX team, and communicates with the editor about where critical 3D transitions will occur. In practice, this often means sitting long before the shoot, filling out Excel spreadsheets, and analyzing test takes.
The role requires both technical detail knowledge and creative intuition. A stereographer who only knows spec sheets becomes an obstacle. One who forgets that 3D shouldn't be visible when it works correctly, also becomes an obstacle. Good stereographers work closely with the DoP and the color grader—because contrast, depth of field, and color dynamics all influence 3D perception.
On set itself, the stereographer monitors the shots on special 3D displays, checking for ghosting (double images due to incorrect parallax) and divergence errors, where the eye actively has to move apart instead of simply focusing. This is tiring, painful, and destroys the immersion experience. The stereographer is the first line of defense against these errors.