Skiopticon image from the Department of Photography at the Royal Institute of Technology. Use by Professor Helmer Bäckström as lecture material. Bäckström was Sweden's first professor in photography at the Royal Institute of Technology in Stockholm of the principle of coinicide distance meters. Bäckström, Helmer. Photographic manual. Nature and Culture. Stockholm. 1942. p. 211-212.

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Size: 2064px × 2421px
Photo credit: © BTEU/TEKNISKA / Alamy / Afripics
License: Licensed
Model Released: No

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