What does camera cannon mean?

Ultra-long focal length, ultra-large aperture and ultra-high price.

For example, Sigma 200-500mm f/2.8 lens.

The lens weighs 34.6 pounds (about 15.7 kilograms, or about 1 pound costs 1 1,000 dollars) and has a size of 9.3X28.6 inches (236x726mm). The performance of telephoto lens combined with the aperture of f/2.8 and the longest focal length of 500mm makes this lens very suitable for shooting wild animals and sports events, and it is also an excellent lens for astronomy enthusiast astrophotography. Add an "accessory" (2X rangefinder) and you can get a zoom range of 400-1000 mm. Even at the end of 1000mm, the aperture of the lens can reach f/5.6.

Canon EF 1200mm f/5.6L USM lens

Canon's 1200mm lens is not as exaggerated as Zeiss's monster lens, but it is also a member of the longest focal length lens field, with a price of 80,000 US dollars (sorry, no discount! ) also makes this lens among the most expensive lenses. This lens with FD interface was originally developed for shooting 1984 Los Angeles Olympic Games. At that time, five shots were customized for newspapers, magazines and news agencies covering the Olympic Games. After the Olympic Games, the lens was shipped back to Canon headquarters in Japan and replaced with EF interface in the late 1980s.