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Reflex sights are optical or computing sights that reflect a reticle image (or images) onto a combining glass for superimposition on the target. Reflex sights are most commonly configured as non-magnifying firearm sights (such as the M68 red dot sight), but they are also used to aid targeting on other devices, such as telescopes and point-and-shoot digital cameras. Reflex sights should not be confused with laser sights, which actually project a point of light directly onto a target. Reflex sights use refractive or reflective optical collimators to generate a collimated image of a luminous or reflective reticle. This collimated image is reflected off a dichroic mirror or beam splitter to allow the viewer to see the field of view and a reflection of the projected reticle (e.g. a red dot) simultaneously. If no magnification is utilized, this gives the viewer a theoretically parallax-free image of the reticle, superimposed over the field of view at infinity. A reflex sight with no magnification can be held at any distance from the eye (see eye relief), and at almost any angle, without distorting the image of the target or reticle, and without causing the reticle to "move" relative to the target. But parallax compensation is not perfect, and depending on the sight's design, the range to the target, and the magnitude of angle at which it is looked into, aiming error can be non-trivial due to parallax. Magnified reflex sights suffer from parallax and fixed eye relief just like conventional telescopic sights. Nevertheless, many reflex sights are available with magnification. The U.S. military has widely-deployed the Advanced Combat Optical Gunsight (ACOG) telescopic reflex sight, but reflex sights are also readily found in conventional-looking rifle scope configurations, used for such activities as hunting and target shooting. Because reflex sights provide an illuminated reticle, they are often used with both eyes open (the brain will tend to automatically superimpose the illuminated reticle image coming from the dominant eye onto the other eye's unobstructed view), giving the shooter normal depth perception and full field of view. This capability, along with the parallax compensation found in un-magnified devices, makes target acquisition very fast compared to standard telescopic sights and iron sights. Un-magnified reflex sights are particularly suitable for installation on a wide variety of weapons used for close-range engagement, e.g. pistols, submachine guns, and shotguns. [READ THE REST OF THIS ARTICLE]
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