Traditional Culture Encyclopedia - Photography and portraiture - There are two modes of AE camera, what do they mean?

There are two modes of AE camera, what do they mean?

This is the camera mode in AE, and one is the two-node mode, which means that the camera has a fixed point and a target point, and a node mode only has the fixed point (i.e. position) of the camera.

Generally speaking, I think it is easier to control with the target point, that is, the origin.