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 1948-1958. Exposure under static pressure # The small circle surfaces exposed under pressure, the larger, surrounding, without pressure. For more info see: Bäckström, Helmer. Photographic manual. Nature and 1942. p. 309.

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Size: 2299px × 2173px
Photo credit: © BTEU/TEKNISKA / Alamy / Afripics
License: Licensed
Model Released: No

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