25.4mm One Inch Tube, Direct Turret Adjustment, Green & Red Illumination,
Min Focus 10 Yds, Range Finder Reticle, Designed for Real Fire Caliber .223
When adjusting the elevation angle (up and down)/wind deflection (left and right), many users will encounter the situation that the reticle does not follow its own adjustment direction and walks in a straight line, but instead walks in an arc or even the adjustment is stuck and cannot be moved.
Not only novices, but also experienced sight users will be troubled by this.
To solve the problem, we must first understand the structure of the scope. Figure 1 shows the parts of the scope. Reticle is placed in the Erector Tube.
The internal structure diagram and imaging process of the sight can be found in the related posts of the first image surface and the second image surface on the official website of Witer Optics. Today we will focus on the steering tube.
Figure 2 shows the cross-sectional view of the scope. The inner tube with divisions is the steering tube. It is fixed in the scope tube by elevation angle adjustment, wind deflection adjustment and return spring. The front end of the steering tube is not connected to the scope outer tube. Direct contact with the inner wall.
If we adjust the elevation angle, the elevation angle adjustment will cooperate with the return spring to push the steering tube up and down. Similarly, the wind deflection adjustment controls the left and right movement of the steering tube.
When we adjust a certain direction to its limit or close to its limit position, there may not be enough space in the other direction for the steering tube to move linearly.
To facilitate understanding, Figure 3 breaks down this process. As shown in the figure, the wind deflection adjustment is almost used to the limit at the beginning. The steering tube is pushed to the left to a position close to the tube wall. At this time, the space for the steering tube to move up and down is very limited. Then continue to adjust upwards. It will hit the inner wall of the outer tube of the scope and cannot move upwards in a straight line, and can only move in an arc along the shape of the tube wall or get stuck and unable to move, which will eventually lead to the inability to adjust the division to the desired position.
This is why some scopes control the total adjustment amount of wind deflection adjustment to ensure enough space for elevation angle adjustment. This approach is called "limiting".
For sights without limit, what we have to do is not to use up the adjustment value in one direction or use the limit when adjusting, leaving room for effective movement in the other direction.
In addition, the installation of the scope and the red dot will also affect the adjustment. The specific content will be explained in detail in the next academic post.
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