Louis Daguerre invented a rudimentary imaging device in France, in 1839. The images, known as "daguerrotypes," were directly made onto metal slides covered with photo-reactive material. As a result, no photo negatives were required. Daguerrotypes required long exposures, so were not practical for many applications. | Louis Daguerre invented a rudimentary imaging device in France, in 1839. The images, known as "daguerrotypes," were directly made onto metal slides covered with photo-reactive material. As a result, no photo negatives were required. Daguerrotypes required long exposures, so were not practical for many applications. |