Here is a video recording of the lecture on this topic:
Mr. Lindroth’s Slides on The Optic and Chemical History of Photography:
Optic & Chemical History of Photo Slides
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Abelardo Morell – Camera Obscura Demonstation 1
Camera Obscura Demonstration by Abelardo Morell
Here is a link to Morell’s website:
Abelardo Morell – Camera Obscura
Video on History of Photography