The first Kodak camera was unveiled in 1888 and Kodak was the first to invent a digital camera in 1976. (Armstrong & Kotler, Princples of Marketing, 2008)
Nikon was founded in 1917 as Nippon Kōgaku Kōgyō Kabushikigaisha which means Japan Optical Industries Corporation.
Canon was founded in Tokyo in 1937.
In 2007, DSLR sales worldwide were divided between Canon (41%), Nikon (40%), Olympus (6%) and Sony (6%). In Japan’s domestic market, Nikon had 43% and Canon 40%.
Although very difficult to measure in camera terms, the aperture of the human eye is about f/2 to f/8, with a focal length of around 24mm.