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 effect. Change of blackening curve for a paper. A is the original curve, b the same after irradiation with sunlight through a red more info See: Bäckström, Helmer. Photographic manual. Nature and Culture. Stockholm. 1942. p. 299.

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Size: 2560px × 1952px
Photo credit: © BTEU/TEKNISKA / Alamy / Afripics
License: Licensed
Model Released: No

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