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Sight (device)
A sight is a device used to assist aligning or aim weapons, surveying instruments, or other items by eye. Sights can be a simple set or system of markers that have to be aligned together as well as aligned with the target (referred to as an iron sights on firearms).〔(Gunsmithing: pistols & revolvers, By Patrick Sweeney, page 185 )〕 They can also be optical devices that allow the user to see the image of an aligned aiming point in the same focus as the target. These include telescopic sights and reflector (or "''reflex''") sights. There are also sights that project an aiming point onto the target itself, such as laser sights.
==Simple sights==
At its simplest, a sight is typically composed of 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 these sights the name "iron sights",〔(Richard Bowyer, Dictionary of military terms, page 178 )〕 a term relative to other weapon sights in that they are not optical or computing sights.〔(merriam-webster.com - iron sight - ''a metallic sight for a gun as distinguished from a sight depending on an optical or computing system'' )〕 On many types of weapons they are built-in and may be fixed, adjustable, or marked for elevation, windage, target speed, etc.〔 They also are classified in forms of notch (open sight) or aperture (closed sight). These types of sights can take considerable experience and skill in the user who has to hold a proper eye position and simultaneously focus on the rear sight, the front sight, a target at different distances, and align all three ''planes of focus''.〔(Dan Shideler, Gun Digest 2011, page 148 )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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