Submitted by Al …
(Adapted from The Encyclopedia of Photography ©1963)
A bipack is two films placed together in a single holder and used with a third film, also in a single holder, to produce three colour-separated negatives. The two films of the bipack are exposed one through the other. When used in a one-shot camera, the bipack receives the direct image. The third separation negative is exposed by reflection.
This system is obsolete for still photography but is used in professional motion pictures to some extent in the Technicolor camera. Bipacks were also used in early motion picture work for two-colour films. The sensitivity in these was arranged differently, so that each film was sensitive to half of the spectrum. The resultant print was made in two colours only, sometimes red and green, and sometimes in blue and orange. All such processes are now obsolete.
Comments