4 Ancient KnowledgeAristotle is the first to describe the principle of the camera obscura when he uses it as an analogy to the way in which an image is formed in the eye.Aristotle, BC
5 The Science of OpticsAlhazen (Abu Ali Hasan Ibn Al-Haytham), who was a great authority on optics in the Middle Ages and lived around the year 1000, built the first camera obscura.
6 Forced PerspectiveJan Van Eyck probably used the camera obscura method to achieve difficult foreshortened perspective. The strongest evidence is in the reflection in the convex mirror on the back wall.Arnolfini Wedding Portrait, 1434
7 A photographic reconstruction (right) of Vermeer's The Music Lesson (left) reveals that a camera obscura may have been a part of the artist's process.
8 A page from David Hockney's book on the use of the camera obscura by the Great Masters which juxtaposes the changes in which faces were painted during theRenaissance and later by the Great Masters. The bottom two faces look more likephotographs than paintings.
9 Modern Camera Obscuras In the 16th Century, the addition of a convex lens helps to focus light better and a mirror is added so the image can be reflected onto a flat surface where it can be traced.
11 Early Photographic Experiments Thomas Wedgwood, son of potterymaker Josiah Wedgwood, experimented with light sensitive materials as early as 1805 and probably earlier. This image was made in the early 1800s or even late 1790s. Most of the images made by this process have been destroyed from exposure to light because they were not able to be fixed.
12 The First SolutionJoseph Nicephore Niepce created the first fixed photographic image, the “heliograph”, in The exposure time was about 8 hours. The heliograph was made on a pewter plate coated with asphaltum. Solvents were used to wash out the asphaltum that had not hardened due to exposure to light. Later, Niepce discovered that he could darken the shadow areas by exposing the plate to iodine fumes.
14 Daguerre’s Contribution Louis Jacques Mande Daguerre continued to work with Niepce until Niepce’s death in Afterwards, Daguerre continued their work alone and eventually perfected the process for the Daguerreotype in 1837.Daguerre used iodized silver- coated copper plates subjected to mercury fumes to develop a positive image. The image was then fixed- originally in a salt solution and later in sodium thiosulfate, or “hypo”.Because Daguerre made his formulas available to anyone, the practice spread. Photography, or Daguerreotypy, became a new profession and a social phenomenon.
15 DaguerreotypesDaguerreotypes were very popular because their sharp detail made them ideal for portraits. But the process had three fatal flaws: 1) they were hard to look at due to their reflective surface, 2) they were very dangerous to produce because they used mercury vapor- a highly toxic substance- in the processing, 3) they were unique, one of a kind images that could not be reproduced, and 4) the materials and uniqueness made them too expensive for most people.
16 Hippolyte Bayard and his direct positive process Bayard claimed to have inventedthe direct positive process beforeeither Daguerre or Talbot discoveredtheir processes. However, he nevermade his process public and wasdenied any credit for his invention untillater in his life.He is credited with presenting the world’s first public exhibition of photographic prints on June 24, 1839.The direct positiveprocess involved exposing silverchloride paper to light, which turnedthe paper completely black. It wasthen soaked in potassium iodidebefore being exposed in acamera. After the exposure, itwas washed in a bath ofhyposulfite of soda and dried.Exposures were very long (about 10-15 minutes.Images were one- of- a- kind andCould not be reproducedHippolyte BayardSelf Portrait As A Drowned ManDirect positive print1840
17 William Henry Fox Talbot In London, Fox Talbot had produced what he called, “photogenic drawings” (we call them “photograms”) as early as These were primarily used to keep records of botanical specimens and needed extremely long exposure times. He published his ideas- but not his formulas- soon after Daguerre in 1839.
18 The CalotypeIn 1841, Talbot switched to a process that produced a negative image on a sensitized paper. He called it the Calotype. Talbot’s process was less sharp and considered inferior to the Daguerreotype for portraiture.Talbot insisted on patenting all of his processes and equipment, so his process was not available to others for free, as Daguerre’s was. However, the paper negative soon proved to have one major advantage over the Daguerreotype - it could be reproduced.The ability to make exact copies made the calotype the forerunner of modern photography and earned Talbot the title of the inventor of modern photography.
19 Calotypes William Henry Fox Talbot David Octavius Hill and Robert Adamson
24 Mark Osterman and France Scully- Osterman France Scully, Light MistMark Osterman, The Rhodes IncidentMark Osterman and France Scullyare photographers and historians at the GeorgeEastman House in Rochester, NY. They practiceand teach many kinds of older photographic processes.Mark Osterman, Fragen (Spain)