red dot scopes



red dot

A Norwegian soldier holding a MP5 with a red dot sight.

The red dot sight, infinity sight or reflex sight is an optical firearm sight, sometimes also used as an aiming sight for telescopes.

Contents

  • 1 How red dot sights work
  • 2 Reticles
  • 3 Types of red dot sights
  • 4 Uses
  • 5 See also

How red dot sights work

A view through a Tasco ProPoint 2 5 MOA red dot sight (model PDP2ST), mounted on a Ruger 10/22 rifle. Made in Japan for Tasco, the ProPoint 2 model was one of the first models of red dot sight that became widely popular.

Red dot sights use refractive or reflective optics to generate a collimated image of a luminous or reflective reticle. This collimated image appears to be projected out to a point at infinity, which makes the image of the reticle appear to the user to be projected onto the target. Due to the fact that the reticle image is collimated, magnifying the image of the target is impractical, as it would make the sight too hard to hold steady. The collimated image does have its advantages, however, as the scope can be placed at any distance from the eye without distorting the image of the target or reticle. This makes red dot sights suitable for use on pistols, submachine guns, rifles, or shotguns.

The most well-known feature of red dot sights is that some, but not all, compensate for the parallax created when the shooter's head moves in relation to the sight. In other words, the dot will point close to the actual point of project impact even when viewed at an angle. However, parallax compensation is not perfect. Depending on sight quality, the range to the target and the magnitude of angle at which it is looked into, aiming error can be significant.[1] The lack of magnification is also an advantage in that both eyes can be left open, and the eye that sees the reticle image will automatically superimpose that image with the image from the other eye, giving the shooter normal depth perception and full field of view. This makes the red dot sight very fast and easy to use.

Reticles

The most common reticle is a small dot, covering 5 minutes of arc, illuminated by a red LED, hence the common term "red dot sight". Sights that use dot reticles are almost invariably measured in minutes of arc, or "MOA". MOA is a convenient measure for shooters using English units, since 1 MOA subtends approximately 1.0472 inches at a distance of 100 yards (91.44 m). This is generally rounded to 1 inch at 100 yards, which makes MOA a very handy unit to use in ballistics. The 5 MOA dot is small enough not to obscure most targets, and large enough to be easily found in a hurry. For many types of action shooting, a larger dot is preferred; 7, 10, 15 or even 20 MOA dots or rings are used; often these will be combined with horizontal and/or vertical lines to provide a level reference.

Common light sources used in red dot sights include battery powered lights, fiber optic light collectors, and even tritium capsules. The color of the dot is usually red or amber for visibility against most backgrounds. Some dots are also visible when viewed through night vision devices. Newer red dot sights may use a chevron or triangular light instead of a dot for precision in aiming and range estimation.

Types of red dot sights

Some of the first red dot sights to appear were "occluded" sights; the image of the target was not visible through the sight. Looking into the sight with just one eye, the shooter saw only a red dot (often passively illuminated with ambient light gathered through fiber optics). With both eyes open, the image of the dot was superimposed by the brain onto the target. Nearly all currently available red dot sights use a curved partially reflective glass as a lens. This lens allows light from the target to pass through unobstructed, but collimates and reflects the light of the reticle back to the shooter's eye, thus allowing for one- or two-eyed aiming.

Modern red dot sights generally fall into two categories, full tube or open designs. Full tube sights look similar to a standard telescopic sight, with a cylindrical tube containing the optics. Since a red dot only really needs a single reflective surface, however, the tube is not needed. Many current designs consist of a flat base, with a single loop of material to support the reflective surface. While some argue that the open design gives the shooter a wider field of view, the actual viewable range of the dot is no larger than a full tube sight. The open sights are usually lighter than a full tube sight, since less material is required. More expensive full tube sights offer the option of polarizing filters and glare reducing sunshades, which are not possible on open sights.

Uses

Red dot sights are common in speed shooting sports such as IPSC. Military units and especially American infantrymen on an individual basis in Iraq are also beginning to adopt red dot sights, since they are easy and fast to use, and due to the fact that they work very well in low-light conditions. Red dot sights are also popular among paintball and airsoft players for similar reasons.

Most red dot sights have either active or passive adjustments for the dot brightness, allowing a very bright dot for high visibility in bright conditions, and a very dim dot to prevent loss of night vision in low light conditions. Since dot sights can be mounted at any distance from the shooter's eye with no issues of focus, military rifle mounts usually place the sight in any mechanically-convenient mounting position, such as the carrying handle of the M16 rifle, or on a rail system (typically a Picatinny rail) on top of the rifle. This leaves plenty of room for night vision equipment to be used with the red dot sight.

Like conventional scopes, red dot sights place the target and the reticle on nearly the same optical plane, allowing a single point of focus. Because there is no magnification, the shooter need not worry about parallax or eye relief. Red dot sights are useful on hard-kicking guns which might drive a conventional scope into the shooters eye; one example would be shotguns used for hunting turkey.

See also

  • Aimpoint CompM2 and EOTech red dot sights
  • Iron sights
  • Telescopic sight
Search Term: "Red_dot_sight"
red dot news and red dot articles

Here's our top rated red dot links for the day:

Red Dot Award Competition Open to Submissions 

Interior Design - Nov 17 12:12 AM
Red Dot Award Competition Open to Submissions An international jury will judge the contest; winners will be announced next June. by Staff Interior Design · November 17, 2006

Trial into speed-boat death gets underway 
The Halifax Daily News - Nov 15 3:46 AM
A tiny red dot on a radar screen recording. This was the central feature of the first day of trial for a 35-year-old charged in a deadly speed-boat accident.

Chiara plays special home concert at the Sheldon 
Daily Nebraskan - Nov 17 1:35 AM
Chiara String Quartet Where: Sheldon Memorial Art Gallery, 12th and R streets When: Friday, Nov. 17; 8 p.m. Who: Chiara string quartet The map that hangs on the door of the Chiara String Quartet's office is punctured with red and yellow tacks. The yellow tacks, which represent future destinations of the quartet, are stuck into states like Colorado, California and Pennsylvania.

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