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 1948-58. Motifus depicting "additive mix of two spectral colors". (For more text see picture) For more info See: Bäckström, Helmer. Photographic manual. other revised edition. Nature and Culture. Stockholm. 1948-59. Cape. 128 tricolorimetry p. 958 and following.

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Size: 2130px × 2347px
Photo credit: © BTEU/TEKNISKA / Alamy / Afripics
License: Licensed
Model Released: No

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