What is the difference between front sight and normal sight?

What is the difference between front sighting and normal sighting? What are the advantages of front sighting?

Answer: The structure of the ordinary sight is: eyepiece - differentiation plate (or differentiation filament) - zoom tube (controlled by the external zoom ring); when the magnification changes, the differentiation plate is at the back end of the zoom tube, so the size of the target There are changes but the size of the differentiated filaments will not change;

The structure of the front differentiation board sight is: eyepiece - zoom tube (controlled by the external zoom ring) - differentiation board (or differentiation filament); when the magnification changes, the differentiation board is at the front end of the zoom tube (this is the front) , so the target and the reticle are enlarged or reduced at the same time;

Comparing the above two structures, it can be concluded that:

1) When adjusting the magnification, the reticle also becomes larger and smaller with the magnification. Therefore, there is no error in the zoom, while the ordinary rear is not.

2) The pre-differentiation sight is basically a glass plate differentiation, because it is almost impossible to paste a metal wire in the middle of the zoom tube and the objective lens, that is, the middle of the mirror body.