 FACT: During one of the scenes where photographers at a photo club  are shooting Bettie Page, there are a few photographers with a  Stereo Realist camera, which was very popular in the 50s. One of  these photographers is holding his Stereo Realist in a vertical  position and taking pictures and this camera must be used only in  the horizontal position due to it being 3D and a vertical image will  not produce the desired 3D result. Realists are never used  vertically.