Even back in the 50s, movies used polarized glasses. The colored ones were usually used for printed material. More recently they have also been used for TV. The latest TV 3D system uses active shutter glasses. Expensive.
John Deering
Even back in the 50s, movies used polarized glasses. The colored ones were usually used for printed material. More recently they have also been used for TV. The latest TV 3D system uses active shutter glasses. Expensive.