Patent of camera lens interface

Since the camera began to monopolize the bayonet, there have been dozens of lens interfaces.

Now the mainstream interface is only a few camera manufacturers.

Japan has Nikon port, Canon EF port and Pentax K port, as well as your Olympus port, Sigma SA port and Sony M Minolta A port.

Germany laika r

and

M-mouth, not to mention large format.

These bayonets can't be used with each other, because the positioning distance of the image plane is different. It is not too difficult to assemble the ring simply, but it is not easy to focus accurately after assembly, and the lens interface size is different. How can a lens with a big ass be installed on a camera with a small mouth?

Although some lenses with a long positioning distance can be installed on the fuselage with a short positioning distance through the connecting ring, at this time, due to different electrical interfaces, some automatic functions are usually lost.

Therefore, it is simply concluded that different brands of lenses cannot be completely universal.

As far as your Olympus is concerned, in addition to the lenses produced by Olympus itself, you can also choose lenses with patented technology of Olympus lens interface such as Sigma and Longteng. However, the conversion coefficient of Olympus is large, and the focal length of the lens should be multiplied by 2 to be the actual focal length angle after installation.