Negretti & Zambra was a firm based in London, England that was a producer of scientific and optical instruments, as well as operating a photography studio. It was founded by a partnership between Henry Negretti and Joseph Zambra. They became the official photographers of the Crystal Palace Company when it was re-erected in Sydenham in 1854, allowing them access to the interior of the building, from which the produced many stereographs. In 1856 they sponsored Francis Frith to conduct a photographic expedition to Egypt, Nubia and Ethiopia, from which over 500 stereographs were produced. They also photographed Shakespeare's House, published a book about meteorological instruments, and commissioned photographer Pierre Rossier to travel to China to document the Second Opium War, from which the first commercial photographs of China, Japan, the Phillipines and Siam were made, all before 1865. The company continued to be known as the worlds most famous instrument makers.