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. [SKC6497, SKC6498, SKC6499 is section of Fig. 79-81 1 page. 84] The chromatic aberration at a positive and a negative lens and the suspension of the fault by a combination of the two lenses to an acromat. For more info see: Bäckström, Helmer. Photographic manual. Nature and Culture. Stockholm. 1942. p. 84.

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Photo credit: © BTEU/TEKNISKA / Alamy / Afripics
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