This thing that looks like a honeycomb board is not used to raise bees, but an anti-reflection device for optical equipment (Anti-Reflection Device), referred to as ARD, developed by an American company called Tenebraex. The registered trademark of the product is called "sh".
kill flash meaning
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background
In military history, there are always some unlucky people because the light reflected by the telescope in their hands or the scope on the sniper rifle exposed their position, resulting in the loss of personnel and the failure of the operation. In Hemingway's "The Bell Tolls"
The protagonist holds the front end of the telescope with the tiger's mouth, so that the broad palm forms a hood on the telescope. This is a simple and practical method for the telescope, but it is inconvenient to use this method on a gun sight.
The current traditional anti-reflective method is to put a cylindrical visor in front of the lens. However, the visor itself is both long and long. It is difficult to imagine a squad/platoon leader carrying a low-power telescope the size of an astronomical telescope to command the battle.
.For snipers, there is still a way to hide a visor, but now more and more low-magnification or no-magnification optical sights are used in foreign military and police forces. The AOCG and AOCG used in the conventional infantry of the US military
CCO is becoming more and more common, and it is very inconvenient to add a big and thick visor to a lightweight assault weapon. The sh was developed under this background.
Design principles
sh actually uses the traditional sunshade principle, but the structure and materials are novel. Its structure is made of a Nomex honeycomb-shaped porous circular plate reinforced with resin material inside a short aluminum cylinder. It looks like a
Honeycomb-shaped porous filter plate. When light passes through these small holes and hits the mirror surface, it is difficult to form a strong large-area reflection, just like installing countless tiny sunshades in front of the lens, but this is Columbus's egg-like idea
and production materials have already applied for patents.
Advantages and Disadvantages
According to official promotional materials, taking the lens of an M144 sniper scope with a diameter of 74mm as an example, the effect of an SH is equivalent to the effect of a traditional 889mm long visor tube. However, there are gains and losses. The disadvantage of SH is that
This honeycomb-shaped filter plate will reduce the light transmission rate in front of the lens, which is said to be reduced by about 15%. However, in any case, SH's concealment made it favored by the special forces as soon as it came out. The US military's special forces were the first to use it in their ACOG
SH is installed on the mobile phone. Now the ground combat troops of other conventional arms have adopted SH as anti-reflective material and installed on telescopes and sights.