History of photography
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The history of photography began with the discovery of two critical principles: The first is camera obscura image projection; the second is the discovery that some substances are visibly altered by ex
A salted paper print taken by Roger Fenton of his assistant and photographic wagon, 1855
Principle of the camera obscura
Principle of a box camera obscura with mirror
Physiognotrace of Hans Lindholm by Gilles-Louis Chrétien
Helmut Gernsheim
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Helmut Erich Robert Kuno Gernsheim was a historian of photography, a collector and a photographer.
Felix H. Man (1945) Portrait of Helmut Gernsheim
Nicéphore Niépce (1827) View from the window at Le Gras