In what year was the inventor of the Abbe prism born?
Abbe prism In optics, an Abbe prism, named for its inventor, the German physicist Ernst Abbe, is a type of "constant deviation dispersive prism" similar to a Pellin–Broca prism.
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.