Large-format 70mm system with stereoscopic capture principles — widely used in East German documentaries and educational films. Pronounced depth through dual-lens acquisition.
The system worked with two synchronized 70mm cameras, whose lenses were positioned at an interpupillary distance (approx. 65mm) apart. This created a true stereoscopic depth effect during projection—via special glasses or screens—that naturally replicated human vision. In GDR documentary filmmaking practice, the process was particularly relevant for scientific and industrial films, where spatial authenticity was intended to draw the viewer directly into the action.
The technical challenge lay in the precise synchronization of both cameras—any frame rate deviation led to headaches and fatigue for the viewer. On set, this meant: strict monitoring of film transport, accurate calibration of lens axes, and a robust sync system that held up even under difficult shooting conditions. Especially for documentaries in factories or mining scenes, where vibrations lurked, this was a constant control function. Exposure had to be identical on both cameras—no post-processing of timing could later correct asymmetrical brightness differences without destroying the stereo effect.
Negative material was expensive, and the film reel per camera was twice as long as needed for mono recordings. This led to deliberate planning: longer takes, less waste, precise preparation. In contrast to later digital 3D processes—where one could play with convergence and interaxial distance—Deltavision 70 was an analog, rigid system. What you optically recorded was fixed. Subsequent stereo adjustments were minimally possible.
Projection required specialized cinemas with polarization or anaglyph technology. This significantly limited its playability—one reason why the format gradually disappeared after the 1980s. But for training films, exhibitions, and high-quality documentaries, the immersive effect was unsurpassed. The effort was justified where the medium itself was part of the message: space exploration, archaeology, complex technical processes.