Long shutter-speeds were required to take photographs during the Civil War which meant photographers often required subjects to pose for shots or they captured distant subjects that made any subject blurring less noticeable. Exposures could be as long as 10-30 seconds.
In this photo provided by the Library of Congress, Gen. William T. Sherman, leaning on breach of gun, and staff at Federal Fort No. 7 in Atlanta, Ga., in September 1864. (AP Photo/Library of Congress/George N. Barnard)