国立アメリカ歴史博物館のインスタグラム(amhistorymuseum) - 3月8日 08時36分

Civil War-era field camera and accessories. Cumbersome by today's standards, field cameras and lenses let photography move outside of the studio and into the landscape. The wet-plate collodion process required wet and dry chemicals and processing trays to prepare plates and develop the negatives.

The process produced glass negatives that were used to print positive images on albumen paper (coated with a light-sensitive mixture including egg whites) or were placed against a dark background to produce ambrotypes, which appeared positive.
#PhotoHistory #CivilWar #Cameras

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