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 While a simple lens has a mirror stain, one of six free lenses has coated objective not less than more info see: Bäckström, Helmer. Photographic manual. Nature and Culture. Stockholm. 1942. p. 93.

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Size: 2633px × 1898px
Photo credit: © BTEU/TEKNISKA / Alamy / Afripics
License: Licensed
Model Released: No

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