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Generated image of correct sight picture for Patridge type sight, with focus on front sight blade, blurring target and rear sight. Date: 15 December 2009, 05:02 (UTC) Source: File:Fuzzy sight picture.png: Author
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Such iron sights are often used as secondary sighting systems in case the main weapon sight (typically an optical sight such as a telescopic sight or red dot sight) malfunctions or becomes unsuitable for the tactical situation at hand, and are therefore referred to as backup iron sights (BUIS).
Reflector sights as aircraft gun-sights have many advantages. The pilot/gunner need not position their head to align the sight line precisely as they did in two-point mechanical sights, head position is only limited to that determined by the optics in the collimator, mostly by the diameter of the collimator lens.
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A diagram of a typical "red dot" sight using a collimating mirror with a light-emitting diode at its focus that creates a virtual "dot" image at infinity The typical configuration for a red dot sight is a tilted spherical mirror reflector with a red light-emitting diode (LED) at its off axis focus.
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]
Mark III free gun reflector sight mk 9 variant. Another type of optical sight is the reflector (or "reflex") sight, a generally non-magnifying optical device that allows the user to look through a glass element and see a reflection of an illuminated aiming point or some other image superimposed on the field of view. [7]