1150_photography.ppt
TRANSCRIPT
17th Century•If light is passed trough
small hole made in the wall of a dark room, an image of the outside scene is made on the wall.
18th century• Scientists found out that some chemicals (silver salts) turned darker when exposed to sunlight.
1826• French inventor, Nicéphore Niépce cevered a sheet of metal with tar, put in a box with a lens and pointed it out the window. Eight ours later, he had a permanent photograph.
By 1839• Louis Daguerre’s was takin pictures in 15 minutes. But only one photo (a glass plate daguerreotype) could be taken at a time.
At the same time• William Fox Talbot began
experimenting with paper.He soon descovered a way of taking negatives. From a negative, unlimited copies could be made of the picture.
By the 1870s• The chemicals used were more efficient and less messy. Exposure times were reduced to less than a second so cameras could be held in the hand for the first time.
1888• A small camera, the Kodak, was invented by American George Eastman.The film was on a celluloid roll. For the first time you did not need to know anything about optics or chemistry to take a picture.
Pixels• Silicon chips with milions of light sensitive elements called pixels combine to convert light into electronic data.
1970• Digital cameras were first developed for military and astronomy purposes.
First digital camera
Nowadays cameras• Today you can find the
tiniest digital camera ever in your phone, under the water, in the space or used inside your body!