Julia Margaret Cameron & others @ NPG

This major new exhibition, Victorian Giants: the Birth of Art Photography brings together, for the first time, the works of four of the most celebrated figures in art photography, Lewis Carroll (1832–98), Julia Margaret Cameron (1815–79), Oscar Rejlander (1813–75) and Clementina Hawarden (1822-65). These four artists would come to embody the very best in photography of the Victorian era. Their experimental approach to picture-making and radical attitudes towards photography have informed artistic practice ever since.