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 part of the previous image (Bäcksröms manual 1st edition, book 2 p. 872) in greater magnification. The longitudinal straight streaks from the upper edge of the image to its lower originating from the secondary diaphragm. For more info see: Bäckström, Helmer. Photographic manual. Nature and Culture. Stockholm. 1942. p. 873.

---

Size: 2440px × 2048px
Photo credit: © BTEU/TEKNISKA / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: