For example: 3-9x42E, 6-24x50AOE and 10-40x56E-SF, etc.
3-9, 6-24 and 10-40: The magnification of the naked eye, the same magnification can see and identify distant targets, suitable for long-distance precision shooting, generally speaking, search and aim at a lower magnification Use a higher magnification to shoot long-distance targets at close range targets. 42, 50 and 56: represent the diameter of the objective lens. In fact, the lens is wrapped with metal material, so the actual objective lens size will be slightly larger.
There is a misunderstanding here. It is wrong to think that the larger the objective lens, the larger the field of view, and the larger the target. The size of the objective lens mainly affects the brightness. The larger the objective lens, the better the brightness. The field of view is also mainly determined by the internal structure of the scope, that is, the field of view (Field of View) parameter of the scope.
The acronym for Electrical, which means light lighting, does not specifically refer to red lighting. Many rifle sight factories call it "photoelectric" because of this.
There is also a misunderstanding here. It is generally believed that "E" means red lighting, and "EG" means red and green light, because G means English Green. This interpretation is wrong. If it is represented in this way, then It should be labeled RG. Manufacturers marked "G" use "EG" to show that red and green lighting is misunderstood.
AO: The acronym for Adjustable Objective. Parallax elimination and ballistic compensation.
The above labels have been inherited from Europe and America for decades. There are also some domestically named names in recent years, such as
SF: The first letter of Side Focus, which means that the focus is on the side
S stands for silver, that is, the scope is silver
Technical parameter description of riflescope
Optical coating (Coating): Coating on the surface of the lens can reduce the reflection and loss of light caused by the lens, and reduce the degree of eye fatigue. The coating is generally magnesium fluoride. The more layers of the coating, the better the optical performance. The types of coating are divided into the following categories:
Coating: single-layer coating on at least one lens
Full coating: single-layer coating on all lenses in contact with air
Multi-layer coating: At least one lens is multi-layer coating, all coatings are coated at least once
Multi-layer full coating: Multi-layer coating on all mirror surfaces exposed to air
Exit Pupil: The diameter of the visible area in front of the eyepiece. The larger the exit pupil, the brighter the image. The method of measurement is to divide the size of the objective lens by the magnification. For example, the exit pupil diameter of 3-9x40 is 4.44mm-13.33mm.
Eye Relief: Also called the exit pupil distance, it is the distance between the eye and the eyepiece. There are two main reasons for this distance. The first is that the scope is mainly used for real iron, and there is a huge recoil, if the eye directly touches the eyepiece, it will be damaged; second, the scope uses inverted image and Kepler In the telephoto system, only the eyes are separated from the eyepiece at a certain distance. When observing, the eyes, eyepiece and objective lens should be kept in a straight line. When observing with high magnification, try not to hold it directly (the scope is not a telescope). The brightest observation effect; the eye gap will change slightly as the multiple changes.
Field of View (Filed of View): The field of view that the scope can see, generally 100 yards or 100 meters as a reference. A large field of view can provide more support in sports competitions and sports goals. The field of view value is expressed in angle units. Generally, the higher the magnification, the smaller the field of view.
