In what year was the inventor of the Abbe prism born?
Ernst Abbe Ernst Karl Abbe HonFRMS (23 January 1840 – 14 January 1905) was a German physicist, optical scientist, entrepreneur, and social reformer. Together with Otto Schott and Carl Zeiss, he laid the foundation of modern optics. Abbe developed numerous optical instruments. He was a co-owner of Carl Zeiss AG, a German manufacturer of research microscopes, astronomical telescopes, planetariums and other optical systems.
Barnett M. Clinedinst Barnett M. Clinedinst, Sr. (December 1835 – December 21, 1900) was an American photographer and inventor. He invented the viewfinder and the mirror-and-prism "reflex" arrangement for which the single-lens reflex camera is named.