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Long exposures, 150 years in the making

July 5, 2013 7:53 AM EDT In Gettysburg, Pa., Rob Gibson keeps a photographic tradition alive by using period accurate equipment and chemicals to make special portraits--wet-plate collodion photographs--of Civil War reenactors. The process is the same that famed Civil War era photographers such as Matthew Brady used, and requires subjects to sit perfectly still for up to 15 seconds for a portrait. (AJ Chavar / The Washington Post)

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