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 R-Biotar with the huge opening F: (large aperture opening). Note the focal plane position right behind the last lens. The lens is used for X-ray äckström, Helmer. Photographic manual. Nature and Culture. Stockholm. 1942. p. 137.

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Size: 2479px × 2016px
Photo credit: © BTEU/TEKNISKA / Alamy / Afripics
License: Licensed
Model Released: No

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