In the early years of photography, landscape studies, architectural views, and studio portraiture were the main focus of the new medium. A photograph such as The Portal of Saint Ursinus at Bourges of 1863 by the Bisson Frères (Bisson Brothers) reveals a widespread interest on the part of the French at that time in their nation's past and in the preservation of historical monuments. Using large-format cameras and glass-plate negatives, the Bissons captured their architectural subjects with exquisite sharpness of detail and purity of light.