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Diopter Sight
A diopter sight is an Iron sight#Aperture sights, aperture sight component used to assist the aiming of ranged weapons, mainly firearms, airguns, and crossbows. Diopters function to precisely align the shooter's eye with the front sight and the target, while also producing beneficial optical effects for accurate aiming. A diopter must be paired with a complementing front sight element to obtain a usable sighting line. Diopter sights used for modern target shooting allow for very fine windage and elevation adjustments, moving the impact point on the order of less than five millimeters at a range of 100 metres. High end diopters typically accept accessories to aid the shooter's ability to see the target clearly. Diopters are found in particular as rear sight elements on rifles. Diopter and globe_sight, globe sighting setups are commonly used in ISSF shooting events, ISSF rifle shooting events. Diopter rear sight The diopter is in principle a vertically and horizontally (elevatio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diopter
A dioptre ( British spelling) or (American spelling), symbol dpt or D, is a unit of measurement with dimension of reciprocal length, equivalent to one reciprocal metre, . It is normally used to express the optical power of a lens or curved mirror, which is a physical quantity equal to the reciprocal of the focal length, expressed in metres. For example, a 3-dioptre lens brings parallel rays of light to focus at metre. A flat window has an optical power of zero dioptres, as it does not cause light to converge or diverge. Dioptres are also sometimes used for other reciprocals of distance, particularly radii of curvature and the vergence of optical beams. The main benefit of using optical power rather than focal length is that the thin lens formula has the object distance, image distance, and focal length all as reciprocals. Additionally, when relatively thin lenses are placed close together their powers approximately add. Thus, a thin 2.0-dioptre lens placed close to a th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Contrast (vision)
Contrast is the difference in luminance or color that makes an object (or its representation in an image or display) visible against a background of different luminance or color. The human visual system is more sensitive to contrast than to absolute luminance; thus, we can perceive the world similarly despite significant changes in illumination throughout the day or across different locations. The maximum contrast of an image is termed the contrast ratio or dynamic range. In images where the contrast ratio approaches the maximum possible for the medium, there is a ''conservation of contrast''. In such cases, increasing contrast in certain parts of the image will necessarily result in a decrease in contrast elsewhere. Brightening an image increases contrast in darker areas but decreases it in brighter areas; conversely, darkening the image will have the opposite effect. Bleach bypass reduces contrast in the darkest and brightest parts of an image while enhancing luminance contr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Warrior Games
The Warrior Games is a multi-sport event for wounded, injured or ill service personnel and veterans organized by the United States Department of Defense. History 2010–2014 The Warrior Games have taken place annually since 2010 except during the COVID-19 pandemic of 2020–2021. It was created by John Wordin working with Gen. Gary Cheek (U.S. Army) while participating in the Ride 2 Recovery 2009 Texas Challenge. Subsequently, a meeting was held at the Pentagon with USO (Sloan Gibson, Kevin Wensing, Jeff Hill) Gen Cheek, Gen. David Blackledge and Sgt. James Shriver. Soon USMC Col. Greg Boyle and the United States Olympic & Paralympic Committee, United States Olympic Committee got involved too. The first event was hosted at the U.S. Olympic and Paralympic Training Center in Colorado Springs, Colorado, which continued to host the event through to 2014. Teams from the United States Army, Army, United States Marine Corps, Marine Corps, United States Navy, Navy/United States ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Feinwerkbau
Feinwerkbau , often abbreviated FWB, is a German manufacturer of firearms and air guns aimed mainly at competitive ISSF shooting events, including some contested at the Olympic Games as governed by the International Shooting Sport Federation (ISSF). The company currently offers three distinct product lines: air gun, air pistols and rifles, small caliber .177 calibre, .177 and .22 Long Rifle, .22 lr rifles and competition pistols as well as two muzzleloader, muzzleloading black powder smallarms, chambered in .36 and .44. It also offers several accessories, an archery trigger release and high-precision industrial CNC, machining and manufacturing services. Feinwerkbau has on-site service staff available at various European shooting events.800fps * FWB 127 5.5mm version of the FWB 124 * FWB 150 4.5mm target rifle, sidelever springer, manufactured ??-1968 * FWB 300 4.5mm target rifle, sidelever springer, recoilless FWB 300 S4.5mm target rifle, sidelever springer, recoilless * FWB 600/6 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hattie Johnson
Hattie Johnson (née Ponti; born September 18, 1981) is a former Olympic athlete. The Athol, Idaho, resident competed in the Women's 10-metre Air Rifle at the 2004 Summer Olympics in Athens, Greece, finishing in 14th place. At the 2003 Pan American Games, she won a bronze medal in the Women's 50-meter Rifle 3 Positions Event. At the 2004 Summer Olympics, Johnson competed while a member of the United States Army. She was then a medical Spc., assigned to the Marksmanship Unit at Fort Benning, Georgia Georgia most commonly refers to: * Georgia (country), a country in the South Caucasus * Georgia (U.S. state), a state in the southeastern United States Georgia may also refer to: People and fictional characters * Georgia (name), a list of pe .... References External links Johnson Places 14th in Olympic Air Rifle Competition 1981 births Living people American female sport shooters ISSF rifle shooters Shooters at the 2004 Summer Olympics Olympic shooters for the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
10 Metre Air Rifle
10 meter air rifle is an International Shooting Sports Federation (ISSF) shooting event, shot at a bullseye target over a distance of using a calibre air rifle with a maximum weight of . It is one of the ISSF sports governed in shooting sports included in the Summer Olympics since the 1984 Los Angeles Games. Shots are fired from the standing position only, as opposed to some other airgun disciplines such as for three positions (popular in the United States) or in disabled sports, which allows sitting and prone positions. Due to the low recoil of air guns and the need for stability, the shooter frequently adopts a deliberately lordotic and scoliotic posture, which allows the non-dominant elbow to be rested against the chest to support the forearm and improves the stability of the shooting stance. The use of specialized rigidly padded vest is allowed to prevent chronic back injury, which can be caused by prolonged asymmetric load on the spinal column. The major competiti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Concentric
In geometry, two or more objects are said to be ''concentric'' when they share the same center. Any pair of (possibly unalike) objects with well-defined centers can be concentric, including circles, spheres, regular polygons, regular polyhedra, parallelograms, cones, conic sections, and quadrics. Geometric objects are '' coaxial'' if they share the same axis (line of symmetry). Geometric objects with a well-defined axis include circles (any line through the center), spheres, cylinders, conic sections, and surfaces of revolution. Concentric objects are often part of the broad category of '' whorled patterns'', which also includes '' spirals'' (a curve which emanates from a point, moving farther away as it revolves around the point). Geometric properties In the Euclidean plane, two circles that are concentric necessarily have different radii from each other.. However, circles in three-dimensional space may be concentric, and have the same radius as each other, but nevert ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
International Shooting Sport Federation
The International Shooting Sport Federation (ISSF) is the governing body of Shooting at the Summer Olympics, Olympic shooting events. It also regulates several ISSF shooting events, non-Olympic shooting sport events. The Federation's activities include regulation of the sport, managing Olympic qualification events and quota places, and organisation of tournaments like the ISSF World Cup, World Cup and ISSF World Shooting Championships, World Championships. The ISSF was founded in 17 July 1907 This international shooting federation was dissolved in 1916. After World War I the international body was founded as Union Internationale de Tir (abbreviated as UIT, in English translated as International Shooting Union) by among others Gerard van den Bergh. The name changed to its current name in 1998. The Federation affiliates more than 150 National Shooting Federation. The ISSF headquarters is in Munich, Germany. Since 2022, the ISSF Presidency has been held by , a former Italian Senator ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diopter Sight Picture
A dioptre ( British spelling) or (American spelling), symbol dpt or D, is a unit of measurement with dimension of reciprocal length, equivalent to one reciprocal metre, . It is normally used to express the optical power of a lens or curved mirror, which is a physical quantity equal to the reciprocal of the focal length, expressed in metres. For example, a 3-dioptre lens brings parallel rays of light to focus at metre. A flat window has an optical power of zero dioptres, as it does not cause light to converge or diverge. Dioptres are also sometimes used for other reciprocals of distance, particularly radii of curvature and the vergence of optical beams. The main benefit of using optical power rather than focal length is that the thin lens formula has the object distance, image distance, and focal length all as reciprocals. Additionally, when relatively thin lenses are placed close together their powers approximately add. Thus, a thin 2.0-dioptre lens placed close to a th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Transparency (optics)
In the field of optics, transparency (also called pellucidity or diaphaneity) is the physical property of allowing light to pass through the material without appreciable light scattering by particles, scattering of light. On a macroscopic scale (one in which the dimensions are much larger than the wavelengths of the photons in question), the photons can be said to follow Snell's law. Translucency (also called translucence or translucidity) is the physical property of allowing light to pass through the material (with or without scattering of light). It allows light to pass through but the light does not necessarily follow Snell's law on the macroscopic scale; the photons may be scattered at either of the two interfaces, or internally, where there is a change in the index of refraction. In other words, a translucent material is made up of components with different indices of refraction. A transparent material is made up of components with a uniform index of refraction. Transparent m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cylinder (geometry)
A cylinder () has traditionally been a three-dimensional solid, one of the most basic of curvilinear geometric shapes. In elementary geometry, it is considered a prism with a circle as its base. A cylinder may also be defined as an infinite curvilinear surface in various modern branches of geometry and topology. The shift in the basic meaning—solid versus surface (as in a solid ball versus sphere surface)—has created some ambiguity with terminology. The two concepts may be distinguished by referring to solid cylinders and cylindrical surfaces. In the literature the unadorned term "cylinder" could refer to either of these or to an even more specialized object, the '' right circular cylinder''. Types The definitions and results in this section are taken from the 1913 text ''Plane and Solid Geometry'' by George A. Wentworth and David Eugene Smith . A ' is a surface consisting of all the points on all the lines which are parallel to a given line and which pass through ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Globe Sight
A globe sight is a front Sight (device), sight component used to assist the aiming of a gun/device, usually those intended to launch projectiles, such as firearms, airguns, and crossbows. It is found in particular as a front sight element on rifles. To obtain a usable sighting line, the diopter has to have a complementing rear sight element. Diopter sight, Diopter and globe sighting lines are commonly used in International Shooting Sport Federation, ISSF match rifle shooting events. Globe front sight The globe front sight consists of a hollow Cylinder (geometry), cylinder with a threaded cap, which allows differently shaped interchangeable front sight elements to be used. Most common are posts of varying widths and heights or rings or holes of varying diameter — these can be chosen by the shooter for the best fit to the target being used. Tinted Transparency (optics), transparent plastic insert elements may also be used, with a hole in the middle; these work the same way as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
