One of the co-inventor of Light Intensity Self-adjusting Camera: EINSTEIN

A patent was registered in United States Patent and Trademark Office, by Gustav Bucky and Albert Einstein in 1936, with a patent no.: 2,058,562. They invented a Light intensity self-adjusting camera: A camera with a device which automatically adjust the light intensity.

Source: United States Patent and Trademark Office 

The full patent can be accessed from this Link