II.Professional Terminology Explanation for Scopes

The range of the visible area through the scope, usually referenced to 100 yards or 100 meters. A larger field of view provides more support for sports competition and moving targets. The field of view is expressed in angular units, and generally, the higher the magnification, the smaller the field of view.

MOA (Minute of Angle) is the unit for the adjustment screw click value. The two knobs in the middle part of the scope are for precision adjustment. The one marked with "Up" adjusts the vertical direction, which is academically called "elevation adjustment." The other one marked with "R" adjusts the horizontal direction, known as "windage adjustment." Generally, there are three types of adjustment knobs: a click moves 1/2 inch, 1/4 inch, and 1/8 inch at 100 yards. The 1/2 inch adjustment is mainly used for red dot sights and low-power scopes, while high-magnification scopes requiring precise aiming usually adopt the 1/8 inch adjustment.

The scope is made of high-strength, durable aluminum alloy and treated with anodized hard oxidation. Each scope is rust-proof, scratch-resistant, and aesthetically pleasing.

Adequate nitrogen filling can completely expel moisture from inside the scope. Good O-ring seals prevent external moisture or dust from entering the interior of the scope. If there is moisture or dust inside, it can easily accumulate on the internal lenses, causing fogging and leading to mold, which affects the performance and lifespan of the scope.

The target image cannot be precisely and clearly projected onto the reticle plane. When the shooter's head is shifted, there will be a noticeable displacement between the reticle and the target, resulting in parallax. This causes the focus to be misaligned and the image to appear blurry. It is the angular difference in the line of sight when observing the same target from two different points, which becomes more apparent when contrasted with other background objects. If the parallax is not correctly adjusted, the reticle will float back and forth on the target image with minor changes in the eye position. In low light conditions, reticle illumination often becomes unclear due to insufficient contrast. To address this, some scopes have a reticle illumination function, which means an additional light source is set inside the scope to illuminate the reticle and increase its reflectivity. However, in low light, reticle illumination can cause glare on the retina or cause the pupil to constrict too much due to excessive brightness, making it difficult to see the surrounding environment. Therefore, only a faint red or green illumination is generally used (red has the least effect on the pupil). In reality, many non-professional consumers often set the brightness to an excessively high level, which directly affects optical imaging. Our company has also found that some inspectors overly pursue the brightness of the reticle illumination for ordinary scopes, leading to increased manufacturing costs, which is not cost-effective. The illumination is merely to enhance the visibility of the reticle.