"A folding camera is a camera type. Folding cameras fold into a compact and rugged package for storage. The lens and shutter are attached to a lens-board which is connected to the body of the camera by a light-tight folding bellows. When the camera is fully unfolded it provides the correct focus distance from the film. The key advantage of folding cameras is their excellent physical-size to film-size ratio when the camera is folded for storage.
Portable folding cameras dominated camera design from the 1890s to 1930s and were significant into the late 1940s. Specialized cameras such as the Polaroid SX-70 Instant film camera, and the Speed Graphic press cameras used folding designs into the 1970s." - (en.wikipedia.org 28.03.2020)
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