The optical scope is selected to be fixed or variable
The following introduces the difference and choice between variable magnification optical sight and fixed magnification sight is a headache, many novices, including veterans, in the face of limited budgets, for the gun whether to install fixed magnification or variable magnification sight and headache. To understand this problem, let's start with the structure of the scope.
The structure of the optical path is very simple. It is divided into objective lens group, rotating lens group, dividing plate, eyepiece group, and these parts. In addition to the ballistic adjustment mechanism and the diopter adjustment part, there are no other active mechanisms in the whole mirror body. Fewer moving parts means increased component reliability. Some fixed multiplier guns, when aimed at the factory, simply will not move the place with glue permanently glued to death. That way, during the shooting, no matter how the gun vibrates. It is the above limited parts that have an impact on it.
Variable power mirror, the structure of its optical path is more complex, divided into objective lens group, rotating mirror group, variable power mirror group, variable power ring, division plate, eyepiece group, these parts. In addition to the ballistic adjustment mechanism and the diopter adjustment part of the whole mirror body, the variable power mirror group and the variable power ring are also one of the active mechanisms. In this way, there are two more mechanisms that cannot be fixed than the fixed mirror, and there are many moving parts, which means that the reliability of the parts is reduced. Some magnifying guns are aimed at the factory, although they will also glue the inactive areas permanently. But because it has so many moving parts, in a shooting, when the gun vibrates. But there are certain errors in the processing and assembly of the scope group, such as the parts are not well matched, the gap is too large, or the screws are loose. Its accuracy will gradually increase. Another aspect that affects the accuracy of the telescopic sight is that after multiple rotations of the telescopic circle, the place above the telescopic group and the telescopic ring match will also produce wear and directly lead to gaps, that is to say, even if the products with high machining accuracy and very precise coordination before the factory may still produce errors due to the interval. From the structure and principle, when we see the difference between variable zoom and fixed zoom, then look at the difference between the two from the application point of view.
Or first talk about the fixed multiple sight, the fixed multiple sight, from the birth of the day, began to serve the war. Until the Vietnam War, the U.S. military's sighting equipment was still dominated by fixed multiple. For example, the sight mounted on the m40 is a ten-fold type. The advantage of fixed aim is reliability. There never seems to be a problem. However, there are advantages and disadvantages, and the hard damage of fixed times is that the reaction speed is slow, and it can only be used at a certain distance. For example: at high magnification, the reaction speed of distant targets is fast. Moreover, optically speaking, compared with the variable magnification mirror of the same magnification, the image is clearer at the same magnification. Imaging deformations and distortions are less. And the resolution is higher, and the sharpness is higher. These two parameters are also one of the relatively important indicators of the scope. If the zoom mirror wants to achieve this imaging level of the fixed zoom mirror, it is not impossible, but the cost will be massively increased.
However, the shortcomings of the fixed magnification mirror are obvious, in the near target, for the magnification mirror, some strength, especially for the sudden appearance of the target. It's hard for shooters to react quickly. In the variable magnification sight, the shooter can set the magnification at a very low place when patrolling, so that he can find the target at any time, shoot at any time, and then adjust to the high magnification target. The other way around. The fixed magnification mirror is very embarrassing in this respect, the magnification is set too high. When the magnification is set too low, the distance is not clear, and the magnification can not be set too high, only the middle value can be taken, so that. The fixed magnification mirror is not high or low. Although many companies have produced more than ten times the high power of the fixed magnification mirror, but in the shooter this mirror is very few. It's usually used for professional target shooting.