Camera Obscura
Camera Obscura (I latin meaning dark room), also reffered to as the pinhole image is the natural optical imagery that occurs when an image of a scene at the other side of the screen (the wall) is prodjected through a small hole in that screen as an inverted reverse image. The surrounding s of the projected image would be relatively dark for the image to be clear so would often be experimented in a dark room.
The term also refers to constructions or devices that make use of the method within a box, tent or room. The camera obscura was used as a way to study eclipses, without damagint the eyes due to direct sunlight. The camera also allowedthe ability to trace prodjected images with accuret detail as it was seen as an easy way to achieve a proper graphical perspective |
William ‘Fox’ Talbot
In 1833, frustrated by his own lack of skill as a draftsman, Talbot began experimenting with the possibility of creating accurate images of the world through mechanical and chemical means. By 1835 he had produced his first camera negative, and soon realized that a positive image could subsequently be obtained by further printing.
The process lay in Talbot’s discovery of a chemical (Gallic acid) that could be used to develop the image on the paper, accelerating the silver chloride’s chemical reaction to the light it had been exposed to. The developing process meant a much shorter exposure times in the camera, from one hour to one minute.
The developed image on the paper was fixed with sodium hyposulfite. The “negative,” as Talbot called it, could yield any number of positive images by simple contact printing upon another piece of sensitized paper. Talbot’s process was superior in this respect to the daguerreotype, which yielded a single positive image on metal that could not be duplicated
The process lay in Talbot’s discovery of a chemical (Gallic acid) that could be used to develop the image on the paper, accelerating the silver chloride’s chemical reaction to the light it had been exposed to. The developing process meant a much shorter exposure times in the camera, from one hour to one minute.
The developed image on the paper was fixed with sodium hyposulfite. The “negative,” as Talbot called it, could yield any number of positive images by simple contact printing upon another piece of sensitized paper. Talbot’s process was superior in this respect to the daguerreotype, which yielded a single positive image on metal that could not be duplicated