"People think that all cameramen do is point the camera at things, but it's a heck of a lot more complicated than that."

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Considering that knowledge of the chemical as well as the optical principles of photography was fairly widespread following Schulze's experiment (in 1725)... the circumstance that photography was not invented earlier remains the greatest mystery in its history... It had apparently never occurred to any of the multitude of artists of the seventeenth and eighteenth centuries who were in the habit of using the camera obscura to try to fix its image permanently.

— Helmut Gernsheim