Properties of Polarizers for Filters and Viewers for 3-D Motion Pictures

High-quality projector filters and viewers are essential to full audience enjoyment of 3-D motion-picture shows. Projector filters of improved type are now in production and constitute an excellent solution to the problems presented by high temperature and high light intensity. Being glass-laminated, they are easily cleaned and thus should last indefinitely. Viewers of excellent polarization characteristics, color neutrality and stability are available. Some minimum performance specifications are proposed, in the interest of insuring that all spectators are enabled to see 3-D presentations with full effectiveness. Optical “leakage” and chemical instability, present in some types of viewers are especially to be avoided.