What is the telephoto lens in practice

We are now trying to simulate a remote lens system with a low-cost fpc1 camera.

The basis of many industrial metering and measurement systems is fpc2. There are a lot of unusual features is FPC have, an image can be generated by it, and, as we all know, its size and shape and the positions of the lens distance and field of view is no relationship. The reason is that the special telephoto lens only focuses on the light parallel to the optic axis.

What is the telephoto lens in practice?

Image distortion can be reduced, and the perspective amplification effect caused by object position change can be eliminated.

However, fpc2 also has disadvantages, which are both large and expensive, but close to a fpc2, we can use the fpc3 scanner. This step is accomplished by limiting the useful field of view to the center of each image in the construction of the fpc4 scan. How did this area of the image come into being? It is produced by light that is almost parallel to the optic axis, so a fpc2 is simulated by us, and we can look at figure 7 below.

This is figure 7. If we want to simulate the TV system, we can make fpc2 complete by limiting the available viewing field.

The incident from all angles is the lens focusing light.

If we build a fpc2 that is the way it is, then it focuses only on the light that is parallel to the optic axis. That makes the image the same size that happens, no matter what the distance from the lens is.

If you want to simulate fpc3, you can make the fpc4 scanner complete by limiting the field to the center of the image.