Series contains cameras that have with more than one lens, to create multiple images on the same light sensitive film or plate. These cameras were designed for several purposes, the most popular being the stereoscopic, or three-dimensional, image. Most stereo cameras work by taking two simultaneous images from slightly varying points of view that correspond to the distance between the human eyes. The images are then mounted side-by-side and viewed through a stereoscope (a system of two lenses that helps to converge the two photographs, to mimic the depth perception of binocular vision). Other three-dimensional cameras used four or more lenses to create images for lenticular prints.
Some multi-lens cameras were intended to create multiple copies of the same scene at one time, such as the gem tintype camera and passport camera, while others had shutters that took sequential shots to create images which show the passage of time on one frame.

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