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. If a contact copy is regarded on the focal length (actually the image width) distance or if the image is magnified and considered equally extended distance, so obtained in both cases the same perspective. More info See: Bäckström, Helmer. Photographic manual. Nature and Culture. Stockholm. 1942. p. 157.

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Size: 2623px × 1906px
Photo credit: © BTEU/TEKNISKA / Alamy / Afripics
License: Licensed
Model Released: No

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