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2. Telescopic sight - Wikipedia

   en.wikipedia.org/wiki/Telescopic_sight

   Variable-zoom telescopic sights in the low magnification range (1–4×, 1–6×, 1–8×, or even 1–10×) are known as low-power variable optics or LPVOs. These telescopic sights are often equipped with built-in reticle illumination and can be dialed down to 1× magnification.

3. Reflector sight - Wikipedia

   en.wikipedia.org/wiki/Reflector_sight

   The dot remains on the target even though the viewer's head is moved side to side. A reflector sight or reflex sight is an optical sight that allows the user to look through a partially reflecting glass element and see an aiming point or some image (helping to aim the device, to which the sight is attached, on the target) superimposed on the ...

4. Aimpoint CompM2 - Wikipedia

   en.wikipedia.org/wiki/Aimpoint_CompM2

   Colt M4 carbine with M68 Close Combat Optic and back-up sight. The CompM2 is a battery-powered, non-magnifying red dot type of reflex sight for firearms manufactured by Aimpoint AB . It was first introduced in the U.S. Armed Forces in 2000, [ 1 ] designated as the M68 Close Combat Optic (M68 CCO; NSN : 1240-01-411-1265).

5. C79 optical sight - Wikipedia

   en.wikipedia.org/wiki/C79_optical_sight

   M145 Machine Gun Optic fitted to a M240B machine gun. The M145 Machine Gun Optic is a variant of the C79 that was developed for the U.S. Army and is commonly mounted on M240 and M249 machine guns. The M145 is unusual when compared with other optical sights in use with the United States military in that ballistic compensation is in the mount ...

6. Advanced Combat Optical Gunsight - Wikipedia

   en.wikipedia.org/wiki/Advanced_Combat_Optical...

   The first ACOG model, known as the TA01, was released in 1987. [3] [4] An example was tested on the Stoner 93 in the early 1990s by the Royal Thai Armed Forces. [5]In 1995, United States Special Operations Command selected the 4×32 TA01 as the official scope for the M4 carbine and purchased 12,000 units from Trijicon. [6]

7. Anti-reflective coating - Wikipedia

   en.wikipedia.org/wiki/Anti-reflective_coating

   If the coated optic is used at non-normal incidence (that is, with light rays not perpendicular to the surface), the anti-reflection capabilities are degraded somewhat. This occurs because the phase accumulated in the layer relative to the phase of the light immediately reflected decreases as the angle increases from normal. This is ...