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. An easy and inexpensive but fully efficient method for leveling glass slab for filter casting. When casting small filters, a larger mirror glass is leveled then the small filter glasses are more info SE: Boström's filter book?

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Size: 2517px × 1986px
Photo credit: © BTEU/TEKNISKA / Alamy / Afripics
License: Licensed
Model Released: No

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