FACTOID # 21: 15% of Army recruits from South Dakota are Native American, which is roughly the same percentage for female Army recruits in the state.
 
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Encyclopedia > Telescopic sight
View through a 4x rifle scope
View through a 4x rifle scope

A telescopic sight, commonly referred to as a scope, is a device used to give an accurate point of aim for a firearm. Other sighting systems are iron sights, red dot sights, and laser sights. Image File history File linksMetadata Download high resolution version (2592x1944, 1429 KB) Summary View through a 4x rifle scope. ... Image File history File linksMetadata Download high resolution version (2592x1944, 1429 KB) Summary View through a 4x rifle scope. ... An assortment of modern firearms using fixed ammunition, including military assault rifles, a sporting shotgun (fourth from bottom), and a tactical shotgun (third from bottom). ... Looking down the iron sight of an M15A4 Carbine (a civilian copy of the M4 carbine) The term iron sights refers to the open, unmagnified aiming system used to assist the aiming of a variety of devices, usually those intended to launch projectiles, such as firearms, airguns, and crossbows; they... A red dot sight is a type of optical aiming device for firearms. ... Lasers were used in the 2005 Classical Spectacular concert Soon after the invention of the laser in 1960, it was described as a solution in search of a problem. However, since that time, the laser has found a place as a useful tool in many scientific, military, medical and industrial...


Telescopic sights are classified in terms of the optical magnification and the objective lens diameter, e.g. 10 x 50. This would denote 10 times magnification with a 50 mm objective lens. In general terms, larger objective lens diameters are better (collect more light and give a wider field of view), the magnification power should be chosen on the basis of the intended use. There are also Adjustable Objectives sights where the magnification can be changed by manually turning one part, the syntax is the following : minimal magnification - maximum magnification x objective lens, e. g. 3-9x40. See also list of optical topics. ... Magnification is the process of enlarging something only in appearance, not physical size. ... An objective lens is the lens in a microscope, telescope, camera or other optical instrument, that receives the first light rays from the object being observed. ... For the geometric term, see diameter. ... Magnification is the process of enlarging something only in appearance, not physical size. ...


Telescopic sights have both advantages and disadvantages relative to iron sights. Standard doctrine with iron sights is to focus the eye on the front sight and align it with the resulting blur of the target and the rear sight; most shooters have difficulty doing this, as the eye tends to be drawn to the target, blurring both sights. Telescopic sights allow the user to focus on both the crosshair and the target at the same time, as the lenses project the crosshair into the distance (50 to 100 yards or meters for rimfire scopes, 150 or more for centerfire calibers). This, combined with telescopic magnification, clarifies the target and makes the target stand out against the background. The main disadvantage is due to the magnification; when the target is magnified, the area to either side of the target is obscured by the tube of the sight. The higher the magnification, the narrower the field of view in the sight, and the more area that is hidden. Rapid fire target shooters used red dot sights, which have no magnification; this gives them the best field of view while maintaining the single focal plane of a telescopic sight. Telescopic sights are expensive, and require additional, different training to align. Sight alignment with telescopic sights is a matter of making the field of vision circular to minimize parallax error. A crosshair is a small shape (typically a + plus sign, right angle, or circle) that aids in aiming firearms, and occasionally for alignment purposes. ... A rimfire is a type of firearm cartridge. ... A centerfire cartridge is a cartridge in which the primer is located in the center of the cartridge case head. ... The red dot sight or reflex sight is an optical firearm sight (also used as an aiming sight for telescopes) that uses a refractive or reflective lens to generate a collimated image of a luminous or reflective reticle. ... Parallax (Greek: παραλλαγή (parallagé) = alteration) is the change of angular position of two stationary points relative to each other as seen by an observer, due to the motion of an observer. ...


Military use of telescopic sights has generally been restricted to snipers on account of their fragility. The glass lenses are prone to breakage, environmental conditions such as condensation, precipitation, dirt, and mud can obscure the external lenses, and the scope tube adds significant bulk to the rifle. Snipers generally used moderate to high magnification scopes with special reticals that allow them to estimate range to the target. Telescopic sights also provide some tactical disadvantages. Snipers rely on stealth and concealment to get close to their target, and a telescopic sight can hinder this. Sunlight may reflect from lenses, and a sniper raising his head higher to use telescopic sights might reveal his position. The famous Finnish sniper Simo Häyhä preferred to use iron sights rather than telescopic sights to present less of a target. The traditional definition of a sniper is an infantry soldier especially skilled in field craft and marksmanship, who kills selected enemies from concealment with a rifle at long distances. ... Simo Häyhä (December 17, 1905 – April 1, 2002) was a Finnish soldier, and is widely considered to be the most successful sniper in history. ...


Some militaries do issue telescopic sights to their infantry, but they are usually low magnification sights like red dot sights. Most notable, the British army fielded the SA80 rifle with a 4x optical sight as a standard to allow average shooters (i.e. most of the soldiers) to fire more reliable. Infantry of the 36th Ulster Division, in the First World War Infantry are soldiers who fight primarily on foot, mainly with small arms and operate within organized military units. ... British soldier with L85 in the 1991 Gulf War British soldier with L85 SA80 (Small Arms for 1980s) is a family of related arms that include the British Armys standard combat rifle. ...


See also

A red dot sight is a type of optical aiming device for firearms. ...

External links

  • UK Scope equipment

  Results from FactBites:
 
Telescopic sight - Wikipedia, the free encyclopedia (1498 words)
Telescopic sights are classified in terms of the optical magnification and the objective lens diameter, e.g.
Telescopic sights come with a variety of different reticles, ranging from the traditional crosshairs to complex reticles designed to allow the shooter to estimate accurately the range to a target, to compensate for the bullet drop, and to compensate for the windage required due to crosswinds.
Telescopic sights allow the user to focus on both the crosshair and the target at the same time, as the lenses project the crosshair into the distance (50 to 100 yards or meters for rimfire scopes, 150 or more for centerfire calibers).
  More results at FactBites »

 
 

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