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A sight is an aiming device used to assist in visually aligning ranged weapons, surveying instruments or optical illumination equipments with the intended target. Sights can be a simple set or system of markers that have to be aligned together with the target (such as iron sights on firearms), or optical devices that allow the user to see a sometimes optically enhanced (e.g. magnified) image of the target aligned in the same focus with an aiming point (e.g. telescopic sights, reflector sights and holographic sights). There are also sights that project an aiming point (or a "hot spot") onto the target itself, such as laser sights and infrared illuminators on some night vision devices.

At its simplest, a sight typically has two components, front and rear aiming pieces that have to be lined up. Sights such as this can be found on many types of devices including weapons, surveying and measuring instruments, and navigational tools.

On weapons, these sights are usually formed by rugged metal parts, giving them the name "iron sights", as distinct from optical or computing sights. On many types of weapons they are built-in and may be fixed, adjustable, or marked for elevation, windage, target speed, etc. They are also classified in forms of notch (open sight) or aperture (closed sight). These types of sights can require considerable experience and skill, as the user has to hold proper eye position and simultaneously focus on the rear sight, the front sight, and a target, all at different distances, and align all three planes of focus.

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