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M4 collimator sight on a M4 mortar. A collimator sight is a type of optical sight that allows the user looking into it to see an illuminated aiming point aligned with the device the sight is attached to, regardless of eye position (with little parallax). [1] They are also referred to as collimating sights [2] or "occluded eye gunsight" (OEG). [3]
Adjustable focus lenses, like single-focus lenses, also reduce image-jump and spatial distortion in the field of view associated with traditional multi-focal lenses. Additionally, the ideal near-vision correction can be achieved with precision, because the variable lenses emulate the focusing action of the youthful (non-presbyopic) eye.
On weapons, these sights are usually formed by rugged metal parts, giving them the name "iron sights", [4] as distinct from optical or computing sights. [5] On many types of weapons they are built-in and may be fixed, adjustable, or marked for elevation , windage , target speed, etc. [ 3 ] They are also classified in forms of notch (open sight ...
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Rear, rotating diopter drum sight of a SIG SG 550 service rifle.The viewing aperture above the "3" (denoting the 300 m setting) can be seen. The diopter is in principle a vertically and horizontally (elevation and windage) adjustable occluder with a small hole (aperture), and is placed close in front of the shooter's aiming eye.
A bow's central mount for other components (limbs, sights, stabilizers and quivers) is called the riser. Risers are designed to be as rigid as possible. The central riser of a compound bow is usually made of aluminum, magnesium alloy, or carbon fiber and many are made of 7075 aluminum alloy.
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