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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.
A view through a Tasco ProPoint red dot sight. The mid- to late 1970s saw the introduction of what are usually referred to as red dot sights, a type that gives the user a simple bright red dot as an aiming point. [27] The typical configuration for this sight is a compact curved mirror reflector design with a red light-emitting diode (LED) at ...
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Diagram of three types of reflector sights that produce collimated reticles. The top uses a collimating lens (CL) and a beam splitter (B) to create a virtual image at infinity (V) of a reticle (R). The bottom two use half silvered curved mirrors (CM) as the collimating optics with the reticle off-set or between the mirror and the observer.
The Aimpoint CompM4 is a "tubed" style reflector (reflex) sight that uses a red light-emitting diode (LED) at the focus of a mirror type optical collimator to produce an aligned red aiming spot (what is commonly called a red dot sight). There are a total of 16 brightness settings for the LED, the lower 7 intended for use with night vision ...
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A simplified illustration of the parallax of an object against a distant background due to a perspective shift. When viewed from "Viewpoint A", the object appears to be in front of the blue square. When the viewpoint is changed to "Viewpoint B", the object appears to have moved in front of the red square. This animation is an example of parallax.