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A Swift model 687M variable power rifle telescopic sight with parallax compensation (the ring around the objective lens is used for making parallax adjustments). Telescopic sights are classified in terms of the optical magnification (i.e. "power") and the objective lens diameter. For example, "10×50" would denote a fixed magnification factor ...
Nightforce Optics, Inc. is an American manufacturer of high-end telescopic sights, spotting scopes and mounting accessories, based in Lavonia, Georgia with factory headquarters in Orofino, Idaho. Established in 1992, the company is the optic subsidiary of Lightforce Performance Lighting , an Australian manufacturer of specialty lighting ...
The scope body is sealed and filled with nitrogen, which prevents fogging of optics and was designed to function within a -50 °C to 50 °C temperature range. For zeroing the telescopic sight the reticle can be adjusted by manipulating the elevation and windage turrets in 5 centimetres (2.0 in) at 100 metres (109 yd) (0.5 mil or 1.72 MOA ...
Similarly, an adjustment click on a scope with 0.2 mrad adjustment will move the point of bullet impact 2 cm at 100 m and 4 cm at 200 m, etc. When using a scope with both mrad adjustment and a reticle with mrad markings (called a mrad/mrad scope), the shooter can spot his own bullet impact and easily correct the sight if needed.
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]
[6] [7] [8] Although these are referred to as "parallax free" sights, the system keeps the aiming dot in alignment only with the sight itself and does not compensate the inherent parallax errors induced by a collimated sight. [9] [10] Red dot sights generally fall into two categories, "tube" or "open" designs.
Unertl Optical Company, Inc. was a manufacturer of telescopic sights in the United States from 1928 until 2008. They are known for their 10× fixed-power scopes that were used on the Marine Corps' M40 rifle and made famous by Marine Corps Scout Sniper Carlos Hathcock during the Vietnam War.
Unlike earlier passive starlight weapon scopes the AN/PVS-4 provided a high quality image without significant distortion, could adjust to changing ambient light conditions, was able to take multiple reticles to operate in many roles and had protective features allowing it to shut down in the event of exposure to bright light, but still recover ...