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.
CONCEPTS WHAT SHOULD CONSIDER ?
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.
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.
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 .
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 .
WHAT HAS A DISPLAY STRUCTURE? :
VISOR TYPE VARMINT
WORLD CLASS TYPE VISOR
WHAT IS A RED DOT ?:
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 .