In 1935, Bucky and Einstein jointly filed a patent application for a camera that self-adjusted the amount of light that was let into the photographic plate. A few years later, Kodak introduced an automatic camera called the Super Six-20, but the two cameras operate on different principles. In June 1940, Bucky and his wife Frida were the signatory witnesses to Einstein's petition for naturalization requesting U.S. citizenship. Bucky and Einstein remained very close, and Bucky was present when Einstein was on his deathbed.
