The Røros Museums photo archive comprises some 70.000 negatives, slides and digital pictures. The collection of negatives is primarily. The photographing of working processes and cultural heritage is being continuously carried out. The Røros Museum administers the Iver Olsen collection of some 50.000 negatives. In addition, we have several small, private collections. There is great interest in the museumís photographic collection for research, publications, design work and other use.