The J. Paul Getty Museum
License, verbatimCC0
The J. Paul Getty Museum: image dedicated to the public domain under Creative Commons Zero (CC0), stated on the media record itself ('Rights for Media'), with download clearance.
Antoine Claudet. [Self-portrait of Antoine François Jean Claudet and his son Henri Posed with His Invention, The Focimeter], about 1851–1853. The J. Paul Getty Museum.