![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 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](https://c8.alamy.com/comp/2F77DT0/skiopticon-image-from-the-department-of-photography-at-the-royal-institute-of-technology-use-by-professor-helmer-bckstrm-as-lecture-material-bckstrm-was-swedens-first-professor-in-photography-at-the-royal-institute-of-technology-in-stockholm-1948-1958-on-the-curve-the-veil-1-the-threshold-2-the-maximum-range-6-and-the-solarization-7-for-more-info-see-bckstrm-helmer-photographic-manual-nature-and-culture-stockholm-1942-p-266-272-2F77DT0.jpg)
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
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