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 drawing over the subtractive äckström, Helmer. Photographic manual. Other revised edition. Nature and Culture. Stockholm. 1948. p. 992.

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Size: 2249px × 2223px
Photo credit: © BTEU/TEKNISKA / Alamy / Afripics
License: Licensed
Model Released: No

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