Does the scope division need lighting?
This is basically a personal preference. Sniper scopes with lighting are generally more expensive. But the advantage is that it is easier to see the divisions in strong light or dim environments. It is useful in the 15 minutes at dawn and dusk, because generally at this time, the strong light but the lower wind is a good time for medium and long-range shooting.
What is SFP and FFP
Most mirrors are SFP (Second Focus Plane), which means that the reticle (line of sight) is engraved on the rear eyepiece, so the size of the reticle is fixed and does not change with the change of magnification. The advantage is that the size of the reticle can be done Optimum, the thickness is just right. The disadvantage is that differentiated functions, such as BDC and Mil Dot (explained later on BDC and MilDot) can only be used at the highest magnification. (Actually, it can be used at low magnification, but the calculation will be very troublesome)
FFP (FirstFocus Plane) is the choice for the rich and handsome. With the same lens, FFP will be much more expensive than SFP. The reticle is engraved on the front end of the objective lens and changes with the magnification. The advantage is that the division function can be used at all magnifications, but the disadvantage is that the division will appear very small under low magnification, especially under strong light, which is very difficult to see. If you choose an FFP mirror, it is recommended to choose an illuminated mirror.
The reticle of FFP varies with the magnification, and the size of SFP is fixed.
Common Sniper Scope Reticle Optical Scope
The simplest cross division. Not recommended. If the division is too thick, it will cover the target and affect the accuracy; if the division is too fine, it is difficult to see clearly in complex environments, such as the jungle or strong light.
Duplex
Duplex divisions with 3 different thick lines
Improved on Plain Crosshair, the center of the aiming line is thinner and the sides are thicker, which not only compensates for the shortcomings of the above-mentioned crosshair, but also makes the eyes focus on the crosshair involuntarily, and can be used as a simple dense spot according to the length of the thick and thin crosshair. It is recommended to friends who only hit within 300 meters and don't want to count ballistics, but only feel Holdover (aim at the target by feeling to compensate for ballistics). Leupold invented this division, but now many companies are doing it, and each has a different name. Leupold – Duplex, Nikon – Nikoplex, Burris – Plex, Bushnell – Multi-X, Weaver – Dual-X, Steiner – 7B.
BDC/Ballistic Reticle
On the basis of Plain Crosshair or Duplex, Bullet Drop Compensation (BDC, Bullet Drop Compensation) points are directly engraved on the lens. It is recommended to friends who often play a bullet, within 500 meters, and do not require high accuracy. Its advantage is that it can aim quickly without any ballistic calculation. For example, to hit a 300-meter target, just use the BDC point corresponding to the 300-meter target to aim at the target. The downside is that most of the divisions do not have wind deflection points, and to correct the wind deflection depends on the wind deflection knob.
Few Ballistic/BDC divisions with wind deflection points
In addition, the versatility of BDC division is low, and the accuracy of aiming with BDC points is not very high. Because the BDC is made according to the specific environment and the trajectory of a specific bullet, any factors that affect the trajectory, such as altitude, temperature, humidity, changing bullets, and changing guns, will make the BDC inaccurate. (Although the bullets of the same caliber have little deviation in the short and medium range). In fact, it is best to customize the BDC knob if you want the BDC function. Because changing the BDC knob is much easier than changing the BDC division.
