History of photography

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 exposure to light. There are no artifacts or descriptions that indicate any attempt to capture images with light sensitive materials prior to the 18th century. Around 1718, Johann Heinrich Schulze used a light-sensitive slurry to capture images of cut-out letters on a bottle.

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