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red dot sights | 
Reflex sights are optical or computing sights that reflect a reticle image (or images) onto a combining glass for superimposition on the target.[1] Reflex sights are most commonly configured as non-magnifying firearm sights (such as the Aimpoint CompM2 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.
Military organizations have adopted reflex sights for a variety of reasons, including durability, simplicity, quick target acquisition, and superior performance over iron sights in low-light conditions. The United States Army issued thousands of Aimpoint CompM2 units (designated M68 Close Combat Optic) to its troops in support of the War on Terrorism. Reflex sights are also widely used by civilian shooters, e.g. in speed shooting sports such as IPSC, and among paintball and airsoft players.
Most reflex sights have either active or passive adjustments for the reticle brightness, which help the shooter adapt to different lighting conditions. A very dim reticle will help prevent loss of night vision in low-light conditions, while a brighter reticle will display more clearly in full sunlight. Since non-magnified reflex sights aren't dependent on eye relief, they can theoretically be placed in any mechanically-convenient mounting position, such as the carrying handle of the M16 rifle, or on a rail system on top of the rifle. This provides configuration flexibility, and the ability to more easily accommodate other important tactical optics, such as night vision equipment or co-mounted magnifiers.
The potentially long eye relief distance of non-magnified reflex sights makes them useful on firearms with heavy recoil. For example, the short eye relief required by traditional telescopic sights can present the risk of eye and face injury as the scope travels back toward the shooter when a powerful weapon is discharged.
Reflex sights are also used on some telescopes, to help aim the telescope at the desired object. "Point and shoot" type digital cameras with electronic viewfinders are sometimes aided by reflex sights as well. Such cameras often suffer from "viewfinder blackout" if the screen is slow to refresh when taking continuous action shots of moving objects. This can result in the subject drifting out of frame undesirably. A reflex sight properly calibrated with the camera's viewfinder allows the photographer to track the moving object using the reflex sight to aim the camera, keeping the subject in view between each frame.
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