How can the shooting accuracy of China's 95 rifles be greatly increased after installing the sight?

After the 95 rifle was loaded with a sight, the shooting performance increased significantly.

In fact, even at the distance of 100 meters, the guns of the mechanical sight can not be accurately aimed, and the shooter can grasp the general point of sight indirectly through the overall outline of the target. In order to achieve accurate aim at 100 meters, the shooter should at least see the target area of its aim at least to achieve direct aim, which must depend on the magnified vision and accurate division provided by the sight.

The theoretical limits of human eye resolution can reach 18-20 seconds, that is, 0.3-0.33 angle. But limited to the distribution of photoreceptor cells and specific physiological structural defects, the best eyesight in the human eye sensitive ray band, and under sufficient lighting conditions, can only reach 1 corners; if light conditions are only general, it falls to 2 angles - normal eyesight is generally between 3-5 corners. More intuitively, most people, usually at 90 meters, can't distinguish between objects less than 8 to 13 centimeters wide - no matter how observers focus and adjust their eyes.

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Although this ability is sufficient for ordinary people, once more complex and unfavorable conditions, such as dim light at dawn and dusk, and the deliberate search for concealment by the opponent, even within 100 meters, the visual power and efficiency of the naked eye can be reduced to a difficult point. Yes, not to mention hundreds of meters, one thousand meters away. The reader may wish to choose a landmark building on a Google map with a known distance, and then try to observe the details of the building and pedestrians in different conditions. It is for this reason that the telescope, originally used as an astronomer to break through the limits of human vision and to observe celestial tools, was quickly used in military use - and the sight is a variant of the telescope based on the telescope.

The mainstream telescopic sight inherits the basic optical principle of the Kepler telescope. In the simplest model, the Kepler optical structure is made up of two convex lenses, and the magnification is determined by the ratio of the focal length between them. Unlike a Galileo optical structure consisting of a convex lens and a concave lens, the Kepler optical structure is a solid image between the two lenses, so by setting the reticle at the focal point between the lenses, the image can be clearly seen in the field of vision and superimposed on the observed scene.

What Kepler himself did not realize at that time was that this feature endowed Kepler with extraordinary engineering and military practical significance. Especially in the age of the barrel of gun barrel, the projectile is no longer colliding and bouncing forward in the barrel, it is not only a waste of gas energy but also difficult to hit the target. The high efficiency air tightness and high speed rotation formed after the projectile or projectile deformation is embedded in the rifle, so that the projectile is allowed. Get higher initial speed and steady and accurate flight. At this time, the limitation of human eye vision for observing the aiming ability has become the biggest short board restricting the effectiveness of weapon firing.

When people find that they are observed in the distance, there are some clear signs on the field of vision, which can be conveniently located and measured. Then the demand for the combination of optical products bearing this function and weapons is also put on the agenda. It can be said that the military demand for the sight is early and strong, its practical process is relatively late, the biggest reason is limited by the time of optical principle and the progress of manufacturing process.