A telescopic sight can increase the chances of hitting the shot at long range, as visually about the objective and provide sufficient time to obtain a safe, reliable and accurate shot clearly.


Increases ( Magnification ) :
It is the ability to zoom into view, the object to which we are aiming for, or the property of oversized view , any object when looking through the viewfinder. They can be fixed or variable (zoom ) and is identified by a fixed - number - or two if the increase is variable. These numbers indicate the power of viewfinder to enlarge the image. The way to identify , for example , 3-9x - that is , 3 to 9 times larger . When it comes to the variable display means is increased or decreased by turning the eye which is usually marked .
Two considerations to keep in mind when choosing this parameter:
- A major power or gain , lower luminosity ( see worse).
- At higher magnification , we will have more difficulty to set a moving target.
Brightness or opening ( Aberture ) :
This characteristic is defined by the diameter of the front lens or input . In general, we can see that the larger the diameter , the more light will enter and therefore look better . Usually follows the increases and is preceded by the letter " x " . Example: A 3-9x40 viewfinder indicates having 3-9 increases and the inlet diameter is 40 mm.
Reticle :
To know in advance where the projectile impact , looking through the viewfinder need a medium that tells us so . This is known as grid and usually cross-shaped , with the point of impact where the two lines intersect . Over time, as new systems are becoming more common because of their greater ability to locate over white have emerged. They are called Red Dot and consist usually in a bright - red- point indicating the point of impact .
We must make certain adjustments in the event that the intersection of the cross does not match the impact site . It is usually made ​​by two wheels on the viewer move the cross to the desired site. Generally, the upper wheel makes the cross to move vertically and horizontally side wheel .
The illustration show below , you can see the most common grids riding viewers . 30-30 is that the model is usually incorporated and include its effectiveness at close range.


Exit pupil:
This variable is directly dependent on the brightness of the viewfinder. To calculate this, the aperture increases divides. Example: A viewer with magnitudes 2 - 5x50 , will have an exit pupil increases 5 (50/5 = 10) 10 This value is the point of the eye that collects light . .
Field of view :
It is the area that we can see through the viewfinder . Normally , it is expressed as the width in meters that we see for a given distance , typically 100 meters. Logically , the higher the magnitude of the increases will have less field of view . With regular use of our display , we can determine the distance to the target based on their occupation in the viewfinder.
There are grids that incorporate systems to calculate this distance. To highlight the Dragunov , with a drawing as a rangefinder , which facilitates the location in distance of a target with great precision. It is a grid with a military use and their main drawback is that the display can not be variables increases . Is effective only with fixed magnification viewers because any variations in the level increases it disables this function .
Eye Relief:
Very important feature that indicates how far we have to bring the eye to see properly. There accidents have the eye too close to the viewfinder when shooting a rifle due to recoil . In the case of air guns this risk is much lower , having a much lower recoil .
To take into account the treatment (coated optics ) crystals in the viewfinder that makes us earn contrast, brightness or avoid reflections . These treatments are incorporated into higher quality viewers .










As its name suggests, this is exactly what appears in our scope.




When using a viewer of this type , we must keep both eyes open . A red dot superimposed on the spotlight appears. Should be right-handed, left eye provides peripheral vision and the right is looking at using the RD . The brain superimposes the two images , giving a clear view of the target and a wide peripheral view. This facilitates faster reappoint .
This question is downright useful in scenarios where the short time available to target is relatively small . Contrary to what you may think , the display does not project any laser at the target, is the shooter who only sees the red dot.
The brightness ( and sometimes color) point can be set and some models include a grid that helps in the task of targeting our goal. The eye does not have to be at a certain point and head can move with respect to the viewer , keeping the red dot located on the target, facilitating action to address the gun and changing lenses in a short space of time. In addition , peripheral vision , since we have both eyes open , provides a clear picture of what is happening around .
Although always called red dot , can be a different color , usually the point can be red or green, and even that does not have to be a point .
However, DR does not have a system to increase the image, which limits the distance vision .