• ancient times: Camera obscuras used to form images on walls in darkened rooms; image formation via a pinhole
• 16th century: Brightness and clarity of camera obscuras improved by enlarging the hole inserting a telescope lens
• 17th century: Camera obscuras in frequent use by artists and made portable in the form of sedan chairs
• 1727: Professor J. Schulze mixes chalk, nitric acid, and silver in a flask; notices darkening on side of flask exposed to sunlight. Accidental creation of the first photo-sensitive compound.
• 1800: Thomas Wedgwood makes "sun pictures" by placing opaque objects on leather treated with silver nitrate; resulting images deteriorated rapidly, however, if displayed under light stronger than from candles.
• 1816: Nicéphore Niépce combines the camera obscura with photosensitive paper
• 1826: Niépce creates a permanent image
• 1834: Henry Fox Talbot creates permanent (negative) images using paper soaked in silver chloride and fixed with a salt solution. Talbot created positive images by contact printing onto another sheet of paper.
• 1837: Louis Daguerre creates images on silver-plated copper, coated with silver iodide and "developed" with warmed mercury; Daguerre is awarded a state pension by the French government in exchange for publication of methods and the rights by other French citizens to use the Daguerreotype process.
• 1841: Talbot patents his process under the name "calotype".
• 1851: Frederick Scott Archer, a sculptor in London, improves photographic resolution by spreading a mixture of collodion (nitrated cotton dissolved in ether and alcoohol) and chemicals on sheets of glass. Wet plate collodion photography was much cheaper than daguerreotypes, the negative/positive process permitted unlimited reproductions, and the process was published but not patented.
• 1853: Nadar (Felix Toumachon) opens his portrait studio in Paris
• 1854: Adolphe Disderi develops carte-de-visite photography in Paris, leading to worldwide boom in portrait studios for the next decade
• 1855: Beginning of stereoscopic era
• 1855-57: Direct positive images on glass (ambrotypes) and metal (tintypes or ferrotypes) popular in the US.
• 1861: Scottish physicist James Clerk-Maxwell demonstrates a color photography system involving three black and white photographs, each taken through a red, green, or blue filter. The photos were turned into lantern slides and projected in registration with the same color filters. This is the "color separation" method.
• 1861-65: Mathew Brady and staff (mostly staff) covers the American Civil War, exposing 7000 negatives
• 1868: Ducas de Hauron publishes a book proposing a variety of methods for color photography.
• 1870: Center of period in which the US Congress sent photographers out to the West. The most famous images were taken by William Jackson and Tim O'Sullivan.
• 1871: Richard Leach Maddox, an English doctor, proposes the use of an emulsion of gelatin and silver bromide on a glass plate, the "dry plate" process.
• 1877: Eadweard Muybridge, born in England as Edward Muggridge, settles "do a horse's four hooves ever leave the ground at once" bet among rich San Franciscans by time-sequenced photography of Leland Stanford's horse.
• 1878: Dry plates being manufactured commercially.
• 1880: George Eastman, age 24, sets up Eastman Dry Plate Company in Rochester, New York. First half-tone photograph appears in a daily newspaper, the New York Graphic.
• 1888: First Kodak camera, containing a 20-foot roll of paper, enough for 100 2.5-inch diameter circular pictures.
• 1889: Improved Kodak camera with roll of film instead of paper
• 1890: Jacob Riis publishes How the Other Half Lives, images of tenament life in New york City


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• 1955: Edward Steichen curates Family of Man exhibit at New York's Museum of Modern Art
• 1959: Nikon F introduced.
• 1960: Garry Winogrand begins photographing women on the streets of New York City.
• 1963: First color instant film developed by Polaroid; Instamatic released by Kodak; first purpose-built underwater introduced, the Nikonos
• 1970: William Wegman begins photographing his Weimaraner, Man Ray.
• 1972: 110-format cameras introduced by Kodak with a 13x17mm frame
• 1973: C-41 color negative process introduced, replacing C-22
• 1975: Nicholas Nixon takes his first annual photograph of his wife and her sisters: "The Brown Sisters"; Steve Sasson at Kodak builds the first working CCD-based digital still camera
• 1976: First solo show of color photographs at the Museum of Modern Art, William Eggleston's Guide
• 1977: Cindy Sherman begins work on Untitled Film Stills, completed in 1980; Jan Groover begins exploring kitchen utensils
• 1978: Hiroshi Sugimoto begins work on seascapes.
• 1980: Elsa Dorfman begins making portraits with the 20x24" Polaroid.
• 1982: Sony demonstrates Mavica "still video" camera
• 1983: Kodak introduces disk camera, using an 8x11mm frame (the same as in the Minox spy camera)
• 1985: Minolta markets the world's first autofocus SLR system (called "Maxxum" in the US); In the American West by Richard Avedon
• 1988: Sally Mann begins publishing nude photos of her children
• 1987: The popular Canon EOS system introduced, with new all-electronic lens mount
• 1990: Adobe Photoshop released.
• 1991: Kodak DCS-100, first digital SLR, a modified Nikon F3
• 1992: Kodak introduces PhotoCD
• 1993: Founding of photo.net (this Web site), an early Internet online community; Sebastiao Salgado publishes Workers; Mary Ellen Mark publishes book documenting life in an Indian circus.
• 1995: Material World, by Peter Menzel published.
• 1997: Rob Silvers publishes Photomosaics
• 1999: Nikon D1 SLR, 2.74 megapixel for $6000, first ground-up DSLR design by a leading manufacturer.
• 2000: Camera phone introduced in Japan by Sharp/J-Phone
• 2001: Polaroid goes bankrupt
• 2003: Four-Thirds standard for compact digital SLRs introduced with the Olympus E-1; Canon Digital Rebel introduced for less than $1000
• 2004: Kodak ceases production of film cameras
• 2005: Canon EOS 5D, first consumer-priced full-frame digital SLR, with a 24x36mm CMOS sensor for $3000;

Thanks to http://photo.net/