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Telescopic sight
History
This section requires expansion.
The first experiments aimed at giving the shooters perspective aid going back to the 17th century. For centuries, various optical aids and primitive predecessors objective scopes were created that had practical limitations or performance. The first practice based telescopic sight refractor was built in 1880 by August Fiedler (Stronsdorf, Austria), forest inspector of Prince Reuss. scopes and eye long additional relief available for the pistol and rifle use scout. A historical example of a scope with a long eye relief is German ZF41 that was used during the Second World War musket rifles 98k.
Type
A scope model 687M variable power Swift rifle with parallax compensation (the ring around the objective lens is used for making parallax adjustments.)
Telescopic sights are classified according to optical magnification and the diameter of the target, for example, 1050. This increases denote 10 times with a 50 mm lens objective. Overall, diameter objective lens is increased by its ability to raise large amounts of light, provide a larger exit pupil and hence provide a brighter image in the eyepiece. In view of the increased fixed magnification power and objective diameter should be chosen on the basis of intended use.
There are also telescopic sights with change the increase. The increase can be varied manually operating a zoom mechanism. variable sites offer more flexibility in shooting at different intervals time, the objectives and the light conditions and offer a wide field of view in relation to low magnification settings. The syntax of variable sites is as follows: extension minimum maximum magnification objective lens, for example, 3940.
Confusingly, some older telescopic sights, mainly manufacturing German and other Europeans, have a different classification in the second part of the name refers to 'the light gathering power. "In these cases, a 481 (4x) the hearing can be assumed to have a brighter image to view a 2.570 (2.5 magnification), but the diameter of the objective lens unrelated direct image brightness, as brightness is affected also by the magnification factor. Usually the lenses of target sites are lower than early modern sights, in these examples, the 481 would have a target of about 32 mm in diameter and 2570 could be approximately 25 mm.
Parameters optical
Telescopic sights are usually designed for specific application for which they are intended. The different designs to create certain optical parameters. These parameters are
Magnification ratio of the focal length of the eyepiece divided into the lens focal length gives linear magnifying power of telescopes. An increase of factor 10, for example, produces a picture as if it were 10 times closer to the object. The amount of enlargement depends the implementation of the scope is designed for. Lower increases lead to less susceptibility to shock. A further increase leads to a smaller field of view.
Objective Diameter The diameter of the objective lens determines the amount of light can be collected to form an image. It is usually expressed in millimeters.
FOV field of view of a telescopic sight is determined by its optical design. Usually symbolized by a linear value, such as how many meters (feet) width will be 100 m (or 100 yards), or an angular value of how many degrees you can see.
The exit pupil scopes and concentrate the light gathered by the objective into a beam, the exit pupil, whose diameter is the diameter of the objective divided by the magnifying power. To get the most effective collection of light and brightest of the image, the exit pupil should equal the diameter of the fully dilated iris of the human eye about 7 mm, reducing with age. If the cone of light leaving eyepiece is larger than the student is going to, either the greatest light the pupil is lost in providing information to the hearing.
However, a larger exit pupil makes it easier to put the eye where it can receive the light, anywhere in the exit pupil cone of light is great to do. This facility placement helps avoid vignetting, which is a view obscured or darkened occurs when the beam is partially blocked. Y, this means that the image can quickly find what is important when trying to game moving quickly. A narrow exit pupil also telescopic sight can be tiring because the instrument should be held exactly in place before the eyes to provide a useful image. Finally, many people in Europe use the telescope at dusk, dawn and night, when pupils are larger. Thus, the exit pupil on the day of about 3-4 mm, a standard is not universally desirable. For convenience, ease of use and flexibility in applications, greater output scopes with older pupils are satisfactory options even when their capacity not fully utilized per day.
Telescopic sight for a Ruger M77 rifle scout Frontera Mark II.
Eye Relief Eye relief is the distance from the eye after the exit pupil or point of view. Is the distance the observer must place your eye behind the eyepiece to view a unvignetted. The longer the distance focal eyepiece, the greater the eye relief. Typical scopes may have eye relief ranging from 25 mm (1 inch) to more than 100 mm (4 inches), but telescopic sights for rifles or pistols need to scout for a longer relief eyes unvignetted portrayals. scopes and relatively eye relief favorable long to prevent a backflow induced by the face and eye injuries and use in cases where it is difficult to keep constant eye. Eye relief can be particularly important for users of glasses. A user's eye glasses is typically further from the eye requires more eye relief to see even the field of vision.
Reticles
Several grids.
Rangefinder reticle.
scopes come with a variety of different grids from the traditional focus complex reticles designed to allow the shooter to estimate accurately the extent of a target, to compensate for bullet drop, and to offset the effect of wind required due to crosswinds. A user may indicate a range of objects of known size, the size of the objects known distances, and even around to compensate for both bullet drop and wind comes known distances with a reticle-equipped scope.
For example, a typical brand duplex Leupold 16 MOA reticle (of a type as shown in image B) in the scope of fixed power, the distance from post to post (ie, between the lines thick grid that encompasses the scope of the image) is about 32 inches (81.3 cm) to 200 yards (183 m) or, equivalently, about 16 inches (40.65 cm) from the center to any charge of 200 yards. If the goal of a known diameter of 16 inches filled only half the total length of the post-post (that is say, filling the center of the scope to target), then the target distance is about 200 yards (183 m). With the goal of a diameter of 16 inch image fills the view from post to post, the range is approximately 100 yards. Other similar ranges can calculate precisely the same way for known target sizes through proportionality calculations. Remnant, for estimating vertical point of aim offset required for bullet drop compensation on flat terrain, and horizontal windage offset (for the estimate from side to side about compensation for corrections necessary objective effect of wind) in the same way can be offset through the use of approximations based on wind speed (from observing flags or other objects) by a trained user using grid marks. The holdunder less commonly used, used for shooting on a slope, it can even be estimated by a suitably qualified users with a range fitted grid, once the slope and tilt range of destination are unknown.
There are two main types of grids:
Wire grids
Recorded grids
wire grids are the oldest type of reticles and are made out of wire. They are mounted in an appropriate position in the optical tube of the telescopic sight. recorded gratings are desired presentation images are recorded on grid an optical element. This optical element (objective) of the etched reticle is then mounted on the telescopic tube as an integrated part of the optical chain targeted. When illuminated through the ocular a wire reticle will reflect incoming light and should not be high contrast black bag. A grid will be recorded in black if backlit. graticule is etched on most consider a more elegant solution and have more flexibility to design grid. Because of this Some manufacturers can provide custom designed grids customer special order. In the most expensive and high-end contemporary telescopic sights etched reticles dominate the market. In cheaper wire grids mounted telescopic views are often to prevent passage of more specialized production and costly.
Lattices Mil-Dot
If the head of a man with a helmet (0.25 m in height) is placed between the fourth bar and the horizontal line, man is about 100 meters away. When the upper body of a man (1 m tall) fits under the first line, which amounts to about 400 meters away.
modern military and law enforcement reticles are generally designed for (stadiametric) telemetry purposes. Perhaps the grid that go flexible, as the "Mil-dot reticle, which consists of duplex crosshairs with small dots at milliradian (Mil) intervals in the field of vision. A milliradian MOA equals 3.43774677078493, which is approximately 21.6 inches at 600 yards, and each MOA equates to 1.0471975511966 inches at 100 yards, often rounded 1 inch to 100 meters for a quick mental calculation.
Users who use the metric system is better off with a Mil-Dot reticle, and it is not necessary the discomfort of unnecessary complications of a non-metric system of measures for mental calculations. Also, the Mil-Dot measurements and calculations are always accurate in the metric system.
A user may be trained fairly accurately measure the range of objects of known size, the size of objects at distances known, and compensate for both bullet drop and wind comes known distances with Mil-Dot reticle-equipped scope.
This is what a sniper Army sees Netherlands for Schmidt & Bender PM II 3-12x50 telescopic sight. The Mil-dots can be seen on the cross. Using a mathematical formula - (w or the height of the goal / number of millions of points) x 1000 = distance - the user can measure the distance to a target. An object of 1 meter in height or width is exactly 1 Mil High or width of 1000 meters in distance. If the user sees an object 1.8 meters in height for example, three million points up through the riflescope the object is to distance of 600 m - (1.8 / 3) x 1000 = 600.
The four horizontal bars on the horizontal line are also intended for (quick) ranging purposes.
Focal plane reticle
Typical internal construction of a grid area with the first focal plane.
The grid is located in the front or rear focal plane (first focal plane (FFP) or second focal plane (SFP)) of the scope. The power telescopic sights set no significant difference, but in variable power scopes front plane reticle remains constant in size compared to the target, while rear plane reticles remain a constant size for the user and the target image grows and shrinks. Front focal plane reticles are slightly longer, but most American users prefer that the reticle remains constant the size of the image changes, so that nearly all variable sites American modern power are telescopic rear focal plane designs. European manufacturers of high-end optics often leave the customer the choice between a grid mounted FFP or SFP.
variable sites with power telescopic front focal plane reticles have no problems with the point of impact shifts. attractions variable power telescopic rear focal plane reticles may have slight impact point changes through its range of increase caused by the positioning of the grid in the mechanics of zoom mechanism on the back of the scope. Generally these changes are negligible impact, but that precision-oriented users who wish to use your telescopic sight with no problems at various levels of increase, often opt for front focal plane reticles. About 2005, Zeiss was the first European manufacturer of high end telescopic conducted military-grade variable magnification telescopic sight models with rear focal plane arrays fitted grids. Unacceptable effect changes get around these places of interest by painstakingly setting all the military grade telescopic sight. The American high-end U.S. manufacturer telescopic sight Optics Inc. also offers military models variable magnification telescopic sight level with the rear focal plane mounted reticles.
Reticle illumination
Any type of grid can be illuminated for use in low light or during the day. With a little grid illuminated with low light, it is essential that its brightness can be adjusted. A grid that is too bright cause glare in the eyes of the operator, which interferes with your ability to see in low light. This is because the pupil of the eye closes quickly after receiving any source of light. Most illuminated reticles provide adjustable brightness settings to adjust the reticle precisely to the ambient light.
Lighting is normally supplied by a battery power LED, although other sources of electricity can be used. The light is projected forward through the endoscope and is reflected in the posterior surface of the grid. Red is the color used, since at least impede, the shooter's night vision. This method of illumination can be used to provide both daytime and low light-grid lighting conditions.
Radioactive isotopes may also be used as a light source to provide an illuminated reticle low-light condition aiming. In places like the C79 or SUSAT ELCAN optical sight reticles are used tritium-illuminated for low light condition aiming. Trijicon Corporation uses tritium in their fight against firearms and optics of the degree of hunting, including ACOG. The source of tritium (radioactive) light has to be replaced every 812 years, as it gradually loses its brightness due to radioactive decay.
The fiber optic temperature (day) light can be collected and directed to an illuminated during on reticulum. Optical fiber gratings automatically interact with the ambient light intensity that makes the brightness of the reticle. Trijicon uses fiber optics combined with other low-light conditions of illumination methods in AccuPoint telescopic sight and some of its models ACOG sights.
Compensation parallax
Parallax problems result from the image of the object is not coincident with the grid. If the image is not coplanar with the grid (which is the image of objective is either ahead or behind the grid), then putting the eyes at different points behind the causes of ocular reticle crosshairs to appear to be in different parts of the goal. This optical effect causes parallax induced aiming errors that can make a telescopic sight user miss a small target at a distance from the telescopic sight was not parallax adjusted.
To eliminate parallax induced errors objective, scopes and can be equipped with a parallax compensation mechanism which basically consists of a moving optical element that allows the optical system to project the image of objects different distances and the reticle of the sight pictures together in exactly the same optical plane. There are two main methods to achieve it.
By making the objective lens the adjustable telescopic sight telescopic sight can compensate parallax errors. These models are often called AO or A / O models, for adjustable objective.
By making an internal lens inside the light clusters mounted somewhere in front of the grid plane adjustable so the telescopic sight can compensate for errors parallax. This method is technically more complicated to build, but more generally liked by parallax adjustable telescopic sight usersnlike AO models, which are read from the top, the establishment of sidewheel can read a minimum of head movement. These models are often called side focus or sidewheel models.
Most scopes and lack parallax compensation, and that can perform very acceptably without this refinement. Telescopic sights set manufacturers these areas at a distance that best suits the intended use. Typical standard factory parallax adjustment distances for hunting telescopic sights are 100 yards or 100 meters to be suitable for hunting shots that rarely exceed 300 yd / m. Some stations and military style telescopic sights without parallax compensation can be adjusted to be free of parallax at distances up to 300 yards / meters to make them better suited to point to longer distances. Rimfires fields, shotguns and muzzleloaders will lower parallax settings, commonly 50 yd / m to cancel, scope and 100 d / m for shotguns and muzzleloaders. Areas of airguns are very often found parallax Adjustable, usually in the form of an adjustable objective, or AO. These may adjust down as far as 3 yards (2.74 m).
The reason why the areas intended for short-range use are often equipped with parallax compensation is that a short (and to a large magnification) parallax errors become more noticeable. One area Typical application lens has a focal length of 100 mm. A 10x optical ideal environment in this example has been perfectly parallax corrected at 1000 meters and functions perfectly at that distance. If the same scope is used to 100 m of the meta-image is projected (1000 m / 100 m) / 100 mm = 0.1 mm behind the reticle plain. An increase 10x the error would be 10 * 0.1 mm = 1 mm in the eye. If the same range as was used at 10 m from the meta-image would be (1000 m / m 10) / 100 mm = 1 mm projected behind from the plain grid. When 10x magnified the error would be 10 mm in the eye.
Bullet Drop Compensation
Bullet Drop Compensation (CDB) (Sometimes referred to as ballistic elevation) is a feature available in some areas of rifle. The function compensates for the effect of gravity on the bullet at a given distance (Referred to as bullet drop "). The property must be tuned for particular ballistic trajectory of a particular combination of rifle and cartridges in a predefined air density. BDC unavoidable bias errors occur if the environmental and meteorological circumstances deviate from the circumstances the BDC was calibrated for. Knobs can be trained to compensate for these errors.
Setting the Controls
The adjustment controls of a scope with adjustment knob tilt with a flag-stop speed and zero seconds.
A telescopic sight can have several adjustment controls.
Approach control the ocular end of the hearing - the intent to obtain a clear image of the object and the grid.
Elevation or vertical adjustment of the grid control.
Zero-stop lifting controls can be set to prevent inadvertent adjustment dial button "below" the leading zero (typically 100 100 meters or yards for long-range fields), or at least avoid tick more than a couple of clicks below zero adjustment. This feature is also useful in long-range fields, allowing the shooter to physically verify the elevation knob is marked all the way, to avoid confusion regarding the status elevation in two or elevation knobs of various revolution.
The effect of wind or horizontal adjustment control of the grid.
Extension of control - intend to change the magnification by turning a ring that is usually marked with varying levels of increased power.
Lighting Control Adjustment grid - to regulate the brightness level of the light parts of the crosshairs.
Parallax compensation control.
View more contemporary telescopic offer the first three adjustment controls. The other three are in the telescopic sights that offer a variable magnification, an illuminated reticle and / or parallax compensation. A common problem with the elevation and windage controls that once adjustment is smooth working adjustment turrets glued et years. This is usually caused by lack of movement in time lubricated turret mechanisms.
Older scopes often do not provide compensation wind and elevation adjustments in scope, but rather using adjustable brackets to give an adjustment. Some modern mounts also allow regulation, but generally aimed at completing the adjustment scope. For example, some situations require fairly extreme elevation adjustments, such as very short range shooting with airguns common or very long shot where the bullet drop becomes very important. In this case, instead of adjusting the scope of the ends tilt adjustment of the scope mount can be adjusted. This allows the bank to operate near the center of its adjustment range. Some companies offer adjustable bases, while others offer bases with a given amount of elevation built in. The adjustable bases are more flexible, but fixed bases are more durable, as adjustable bases can loosen and the change in decline.
Accessories
SCORM LTE J10 F1 with a parasol mounted on the eyepiece and a flip-open lid on the target.
accessories Typical scopes are:
parasols for mounting on the objective and / or eye to Reduce / Eliminate alter the image quality stray light.
Lens hoods that extend the entire length of a gun barrel to improve image quality by blocking chains induced draft mirage (heat waves "or situation resulting from a hot gun barrel).
Covered to protect the lens and / or surface external ocular lens against weather and damage. There are more than slides, bikini and flip-open covers without or with transparent material it covers.
Optical filters such as gray, yellow and polarizing filters to optimize image quality in different lighting conditions.
Kill Flash filters or honeycomb structure for eliminate light reflections from the objective that could compromise a sniper.
filters for laser eye safety to protect operators against being wounded / blinded by laser light. These filters are often an internal part in the assembly of lens elements.
Traffic and protective bags and cases.
Optronics technologies
Integrated laser rangefinder
In 1997, Swarovski Optik introduced the LRS series telescopic sight, looks telescope for the first time in the civilian market with an integrated laser rangefinder. LRS 2-12x50 light can measure ranges up to 600 m (660 yards). The views are currently LRS (2008) there are no more, but the views with similar characteristics are commercially available from several manufacturers.
Ballistic support devices
A team of ballistic / viewfinder system known as the BOR has been developed by the Society of Barrett Firearms and began shipping around 2007. The BOR module is essentially an electronic bullet Compensation Drop (BDC) of the sensor / calculator package for long distance sniping at 2500 m (2734 yards) with a telescopic sight models made by Leupold and Nightforce. To set the proper height settings shooter must enter the type of ammunition in the BOR (using touch pads in the console BOR) to determine the range (either mechanically or by using a laser rangefinder) and turn the elevation knob on the scope until the correct range is displayed Bors. BOR automatically determines the air density, as well as the cannot or tilt in the rifle itself, and incorporates these environmental factors in the calculations of its elevation.
The SAM (Shooter Annex Module support) measures and provides aiming and ballistic and displays relevant data this to the user at the eyepiece of the Zeiss telescopic sight is developed 6-24x72 for. The SAM has integrated various sensors (temperature, atmospheric pressure, angle shooting) and calculates ballistic actuall compensation. All indications are displayed in the eyepiece. It stores up to four different four ballistic firing tables. Therefore, it is possible to use a SAM with four different weapons total, without further adjustment.
CCD and LCD technology
A completely different approach has been applied in the series Digital ELCAN Rifle Scope DigitalHunter combining CCD and LCD technology with electronic ballistic compensation, automatic video capture, field 4 selectable reticles and customizable reticles. In 2008 a DAYNIGHT DigitalHunter viewer that uses infrared light captured by the CCD to improve low-light capabilities came to be available. It is also possible to connect sources of infrared light to use this as a telescopic sight active night vision in total darkness. Some jurisdictions, however prohibit or restrict the use of night vision devices to civilians or firearm for use.
Assembly
Colt Python Silhouette, with a barrel of eight-inch the scope of works, and the case 500 made in 1981 on behalf of the Colt pistol in the store.
As very few firearms come with built in telescopic sights (Military designs such as the Steyr AUG and the H & K G36 being exceptions) to mount a scope to a firearm requires additional equipment. The team is areas available to ride more production firearms. A set of typical scope mounting consists of two parts: the base reach and scope Application of the rings. By choosing the right combination of scope base to adjust the firearm and scope rings to fit the field implementing a wide range of areas can be installed on most firearms. With the right combination of adjustable scope bases and scope rings is also possible to mount various scopes in the same weapon to make the weapon more versatile. However, it is important to note whether or not a particular firearm is difficult to assemble. If it is a weapon or if it is intended long-range shooting, it could be that the amount of vertical adjustment is smaller than required. This can be solved with the help of a vertically inclined base or canted rings. typical edge angles offered by mounting components manufacturers are 20 and 30 MOA. Always is advisable to buy scopes that provide decent adjustment range, preferably a minimum of 60 MOA or more.
Scope bases
The base is attached to the rifle, usually with the screws, as is often designed to have a low profile, and let it use the iron sights when the scope is not present. Some manufacturers provide integral bases in many of their firearms; an example of a firearm is the Ruger Super RedHawk revolver. The most commonly encountered mounting systems are the inch 3.8 (9.5 mm) and the dovetail is mounted 11 mm (sometimes called tip-off mounts), commonly found in rimfires and guns air, the base type Weaver and STANAG 2324 (MIL-STD-1913 "Picatinny rail") base. Ruger scope base uses a proprietary system, if adapters available to convert the Ruger bases into Weaver type bases. Scope and base mounting systems are also manufactured in Europe. specialist manufacturers Ernst Apel GmbH offers a detailed program of mounting solutions for many different weapons. Some of the European mounting solutions are virtually unknown and therefore are rarely applied in the United States. Many European arms manufacturers also developed proprietary systems and offer the basic range of their weapons, such as sharpened Sako dovetails and Tikka uses 16mm dovetail.
Scope rings
Besides needing the type of connector for connecting to the desired base, scope rings must be used to hold the scope of the saddle. The rings should be sized to fit the scope of implementation; common sizes are 3 / 4 inch (19.05 mm), 22 mm, 1 inch (25.4mm), 26 mm, 30 mm and 34 mm. Red dot are commonly seen in sizes larger, as 40 mm, and these often used without a ring mounting systems designed to fit dovetail or Weaver type bases. The rings are also Available in a variety of heights and materials. Ring height is chosen to reach high enough to clear the firearm at a height comfortable for the shooter.
Scope mounting rails
Schmidt & Bender Classic 4x36 with mounting rails fitted with a Suhler claw mount on a drill Gebrder Merkel. Manufactured May 1985.
European manufacturers of telescopic sights often offer the option of mounting rails below the telescopic sight to provide mounting solutions that do not use scope rings or scope of a single ring around the objective of the sight. These lanes are an integral scope body and can not be removed. The rail mount allows the telescope safely and stress-free mounted preferred height and correct distance from the shooter's eye and different weapons.
There are several mounting rail systems offered:
Standard prism
Zeiss ZM / VM, also used by DOCTER
Swarovski Optik SR
Bender and convex schmidt
The prism traditional standard mounting rail system needs to have the scope rail holes in the side of the screws. The latest property systems mainly offer aesthetic advantages for people who have problems with redundant in light drills in case the viewer is used in various weapons. To avoid the drilling of rail scope mounting systems convenience rail have a special connection to engine inside the rail. These connections prevent forever the way outdoor show damage from its assembly work the scope. Property rail systems using the matching slide in mount screws to connect the viewer into the gun. Some lanes property also offer the possibility to tilt the scope up to a left or right.
Rail Interface Systems
telescopic sight will supplied with scope rings on a rail mounted on the receiver Picatinny/MIL-STD-1913 a sniper rifle.
For mounting scopes and / or other accessories for firearms various rail interface systems are available to provide a standardized platform assembly. Probably the rail system interface is best known Picatinny rail or rail or STANAG 2324 MIL-STD-1913 rail used by NATO forces and other officers and civilian users. The name of this interface system comes from the Picatinny Arsenal in New Jersey, where he was tried and was originally used to distinguish it from other rail standards in the moment. Picatinny Rail comprises a series of peaks with a T-shaped flat section interspersed with "slot spacing." rings rifle scope mount mounting either by sliding on one end or the other, by a "rail-grabber" which is attached to the rail with bolts, screws or levers, or in the grooves between sections high. Another railway system interface available in the market is the lane Weaver, Weaver mounting of optics. The only difference between the rail Picatinny and the weaver rail is the size of the slots, although many lanes grabber mounting accessories can be used on any railroad.
Mounting issues
Areas of use firearms in the light of decline, as guns can be mounted ring and a single ring, and this method is not uncommon in small arms, where space is a premium. Most areas are fitted with two rings, one in the front half of the reach and the other in the back half, which provides additional strength and support. The biggest drop in firearms, including pistols Thompson Center Arms Contender heavy recoiling calibers, will use three-ring for maximum support of the scope. Using too few rings can result not only in the circulating shrinking but also even excessive in scope as the gun tube is wound declining.
Areas of heavy guns and pistols piston spring back (which have a heavy "reverse recoil" caused by the piston reaching the end of its travel) suffer from a disease called Scope creep, where the inertia of the possibility for setbacks even as firearm under him. Because of this, scope rings must be precisely fitted to the scope, and tightened very consistently to provide maximum hold without putting uneven stress in the body of scope. Rings that are out of round, misaligned in the bases, or tightened unevenly can warp or flatten the field body application.
Another problem is mounting a scope on a rifle, as some designs leverage, where the shell is ejected out the top of the rifle. Usually, this means the scope will be charged to one side (left for right handed, right for lefties) to allow the deposit to clear the scope. As an alternative to mounting a rifle explorer can be used, which brings relief from reaching the eye forward of the action.
A firearm may not always be able to fit all solutions for optical, so it is wise to have a preferred solution first objective lens reviewed by a professional.
Uses
Telescopic sights have both advantages and disadvantages when compared with iron sights. doctrine standard iron sights is to focus the eye in focus and align it with the consequent lack of definition of the goal and the rear view, most shooters have difficulty in doing so, like the eye tends to be attracted to the target, blurring the sights. Gun users in more than 30 years of age with a keen eye will be harder to maintain order, the item of focus and the element and increase the focus enough to write down the effects, such as lost human eyes gradually focusing flexibility with increasing age. scopes allow you to focus on both the focus and purpose at the same time as the draft lens of the cross in the distance (50 meters or yards to clear the area, 100 meters or more yards for centerfire calibers). That, combined with an increase telescopic clarifies the purpose and makes the target stand out against the background. The main drawback of the expansion is that the area on either side of the target is obscured by the tube of the sight. The greater the increase, the narrower the field of vision in the eye, and the area rather than hidden. The rapid-fire shooters use reflects views that have no increase, giving them the best field of vision, while maintaining the same focal plane of a telescopic sight. scopes are expensive and require additional training to align. View alignment with telescopic sights is a matter of making the field of vision circular to minimize parallax error. To get the most effective light meeting and brightest of the image, the exit pupil should equal the diameter of the fully dilated iris of the human eye to about 7 mm, reducing with age.
Military
Looking through a scope of USMC sniper rifle at a practice range Camp Hansen.
Russian PSO-1m2 current view 4x26 Telescopic military issue.
TIP2 IOR LPS 4x6 grid, the lower left corner can be used to determine the distance of a target of 170 cm in height.
Dual counter-view system: telescopic sight ZF 3x4 covered with red dot sight like those used in German assault rifles G36A1.
Until the early 1990, the military use of telescopic sights was restricted to snipers because of the fragility and cost of optical components, although it had already been used in the American Civil War on rifles, and even earlier for other jobs. Glass lenses are prone to fracture conditions, and environmental impacts, such as condensation, precipitation, dirt and mud sunglasses outdoors. The scope tube also adds significant volume to the rifle. Snipers generally use telescopes moderate to high-rise with special reticles that allow them to calculate the target range.
telescopic sights provide some tactical disadvantages. Snipers are based on stealth and concealment to approach his goal. A telescopic sight can prevent this because sunlight can reflect off the lens and a sniper to raise his head to use a telescopic sight can reveal their positions. The famous Finnish sniper Simo HYH preferred to use iron sights rather than telescopic sights to present less white. the harsh climate can also cause problems for telescopic sights because they are less resistant than iron sights. Many Finnish snipers in WW World used iron sights heavily because telescopic sights not to face cold Finnish winters.
The market for the military for telescopic sight to the long military firing range is very competitive. Several manufacturers of high-end optics are constantly adapting and improving the telescopic sight to meet specific demands of military organizations. Two European companies who work this field is made Schmidt & Bender and Zeiss Hensoldt /. U.S. companies also are very active in this field are Nightforce, USA Optics Inc. and Premier reticles. These high end sighting components generally cost 1,500 / $ 2,000 or more. Among the Typical options for military telescopic sights are reticle illumination for use under adverse conditions of light and the reporting of adjustments of scope or ballistic data for environmental measurements with the operator through the eye view. Military organizations are also a driving force behind the development of ever more versatile million grids of points, as Generation II million grid points Premier Reticles Marine Corps U.S. for USMC M8541 their 7000 Premier / Schmidt & Bender 3-12x50 PM II LP telescopic sights. Other range finding reticle variations like Schmidt & Bender grid P4-fine, which uses the hash marks of millions instead of millions of points for the purposes that they have also been developed at the request of snipers and other assets shooters field long term.
The former Warsaw Pact members produce military scopes for designated marksmen and developed a extensive grid search based on the height of an average human. The grid used in the IOR LPS 4x6 TIP2 Romanian 4x24 rifle scope is calibrated to a white van 1.7 m height of 200 m to 1000 m. The scope of actions of the basic design and Romania stadiametric rangefinder reticle is in the original Russian PSO-1 and the series pospo scope. The base station has to be aligned in the horizontal line of the scale for determining the range and see the above point is to touch the top (point) line of the scale without clearance. The digit in which this alignment occurs determines the distance to the goal.
The Israeli army began the widespread use of telescopic sights by ordinary infantrymen to increase the likelihood of success (especially in low light) and extend the effective range of the standard issue infantry rifles. Palestinian militants in the Al Aqsa Intifada also found that the addition of an economic scope a AK-47 increased its effectiveness.
Today, many question the military telescopic sights to their infantry, usually compact, low magnification views suitable for snap shooting, reflecting places. U.S. Issues Military ACOG, Aimpoint optic EOTech CompM2 and 553 combat. U.S. soldiers in Iraq and Afghanistan often buy their own view of battle and take them home. The British army fields the SA80 rifle with telescopic sight as a feature SUSAT 4 standard. The Spanish Armed Forces standard C7 rifle has a 3.4 ELCAN C79 optical sight. Both Austria and Australia field variants of the Austrian Steyr AUG which has built a 1.5x optical sight integral since its deployment in late 1970. The German Army G36 assault rifles are more or less integrated into the double sighting Combat consists of a telescopic sight ZF 3x4 combined with no increase red dot electronic viewfinder reflex. The combat system of double whale weighs 30 grams (1 ounce) due a housing made of glass fiber reinforced polyamide. All German G36 rifles are adapted to use the NSA 80 II Hensoldt third generation night sight, which clamps the G36 carry handle adapter in front of the housing and co optically standard rifle with dual combat sighting system.
See also
Picatinny rail
References
^ Who invented the gun "Scope."
^ Important Dates Gun in History, compiled and researched by the American Institute of Firearms
^ "Introduction to Optics 2nd ed." Pp.141-142, Pedrotti and Pedrotti, Prentice-Hall 1993
^ Schmidt & Bender 3-12x50 PM II
^ Zeiss: Telescopic sights for handguns
^ U.S. Optics Inc.
^ BSA side wheel focus viewers
^ Schmidt & Bender PM II specifications
^ BSA scope ring
^ BSA shotgun / muzzleloader scope
^ 3-9x32 Mil-Dot Mini jumpers illuminated AO Scope (SCP-M392AOMDL), parallax adjustable from 3 yards
^ Mac an airgun "Droop" mounted
^ Article on Pyramid Air adjustable scope bases
^ Jon R. Sondra (October 1997). "The Swarovski promotion includes free Remington and Browning rifles - Swarovski AG marketing campaign rifle range. "Shooting Industry,. http://findarticles.com/p/articles/mi_m3197/is_n10_v42/ai_20045306.
LRS 2-12x50 ^
^ Barrett BOR Manual
SAM ^ 6-24x72 telescopic sight
^ Digital DigitalHunter Rifle Scope Series
^ Guide to field tactical rifle (Tips & Considerations)
^ European arrest warrant scope mounts
^ European arrest warrant catalog is mounted
^ High-speed video of a Schmidt & Bender telescopic sight PMII, assembly and barrel flexing on a .50 BMG Accuracy International AS50.
^ Premier Reticles
^ Optics The struggle for AR-15 by Zak Smith
External Links
Wikimedia Commons has media related scopes
Demigodllc.com, Practical Shooting sniper rifle - Part II: Optics by Zak Smith
Demigodllc.com, Introduction Rifle Scopes to high-end long distance by Zak Smith
TheTallEngineer.com, MILS and MOA - A comprehensive manual for understanding: types of "Mils" means types of minute of angle (MOA), the derivation of estimation equations by Robert J. Gama Simeone
AllWorldWars.com, Appointment of 2-inch Model scopes, 1906, designed by Warner & Swasey Co. of Cleveland
ChuckHawks.com, Telescopic and Red Dot Sights by Chuck Hawks
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