The magnification factor is of course one of the most basic optical features for a device whose main function is to see the objects that are difficult to see and zoom in distant objects. The first concept that amateurs who are interested in binoculars will encounter is the 8 × 40, 7 × 50 phrases on the binocular models. There are also binoculars capable of zooming 8-24 x 50 – 12-60 x 70.
This expression, which we will often encounter in the world of binoculars, expresses two important parameters: the first digit is used to indicate the magnification power and the second digit is used to indicate the lens aperture. For example, a 7 × 50 binocular has a magnification of 7 times, a lens aperture of 50mm. Zoom binoculars have 12-60 x 70 zoom options from 12 times magnification up to 60 times magnification. This will be 1000 m./83 m.-1000 m./16 m in 12/60 fold zoom. It is recommended to use feet in binoculars approaching 20 floors and above.
The brightness decreases as the magnification power increases or the aperture decreases. Therefore, binoculars with a high magnification factor may have difficulty in showing dark objects. This is why; amateur astronomers attach importance to light gathering power rather than high magnification in binoculars.
It is the most used binocular type in 7 × 30 daylight as it provides a satisfactory result in terms of magnification power and image clarity. For night use, models of the same type of binoculars with a 50mm aperture can be preferred.
In terms of hunting, the most efficient binoculars are 7 × 50, 8 × 56, 9 × 63 power binoculars, provided that the brand and lens quality are good. However, it is very difficult to find other powers other than 7 × 50. Only private companies make binoculars of this power. Handheld binoculars used in armed forces are generally 7x50mm binoculars.
Basic Concepts of Binoculars
In addition to the magnification factor and the ability to collect light, certain features make a difference between the wide variety of brands and models sold on the market, the lack or inadequacy of some features reveals the quality of the device. Before we evaluate the criteria that we should consider in our shopping, let’s go over the special terms that will help us grasp these features.
Coating is a process applied to improve image quality in optical devices. It is carried out by evaporation of fine objects on the prisms, lenses. Thanks to the coating, light losses are prevented and the image is clarified. Appropriate and quality coating is an important factor that determines the quality of binoculars as well as most optical devices.
The concept of focusing, which is also encountered in devices such as cameras and telescopes, is also an important setting for binoculars. By adjusting the lens distances with a rotatable adjustment knob, the clearest possible image is obtained for the point of view.
Central Focus Setting
The central focusing adjuster on a binary binocular is used to adjust the sharpness of both parts in one motion at the same time. There are models in which the sharpness adjustment for the two eyes is done with separate parts.
The exit hole is an optical value obtained by dividing the diameter of the objective lens by dividing it by the magnification coefficient. While the large exit hole provides the advantage of brightness in low light conditions, the main thing to be considered is that the exit hole is fully compatible with the eyepiece size. While this adaptation may differ from person to person, today the binocular hole dimensions vary between 3-7 mm.
Field of view
The field of view is a measure that marks the entire area where our binoculars, which are focused on a certain point, can see clearly around the point of sharpness. As the angle of view of binoculars increases, the field of view becomes wider. Binoculars with wide field of view should be used when observing fast moving objects.
Dioptric correction is a tool that allows users with various eye defects to adjust their own sharpness in the binoculars.
These are large lenses on the head of the binocular, consisting of different glass combinations.
It is the ability of electronic optical devices to clearly display the observed object by repeating point by point (pixels).
Considerations When Buying Binoculars
Following the basic concepts and technical explanations, we found it appropriate to present some points that you should pay attention to when choosing binoculars as a practical list. In binoculars shopping, you can read the controls you need to do while choosing your device below:
Mechanical Control in Binoculars:
Take the binoculars and examine them for workmanship and material quality. In the second stage, hold the binoculars at both ends and slowly turn it over. Make sure the joints are durable and smooth, as there is no rattling sound.
Focus Control in Binoculars:
Move the binocular eye sockets one at a time and together. Be sure to check the focus for both eyes.
Coating Control in Binoculars:
Check the glass surface for light coverage and smudging by holding the binoculars into the light. Note that the light reflected from the front and back of the lens is “above” and “from behind”. If the lens is covered with a non-reflective layer, the reflections will be in shades of blue, pink, green. Otherwise, you will encounter a white reflection.
Check that the body of the eye is suitable for your eye.
Dual Image Control:
See one spot with binoculars with both eyes. If you see double images or feel eye strain, the binocular is out of adjustment. While looking at an object of your choice after completing the adjustment, move the binoculars a few cm away from your eyes. It is important to note that the image formed in this case is definitely not even.
The best binocular technology has always been developed and used by the armed forces. With the end of the cold war, many of the best binocular technologies have become available in the markets at constantly falling prices. High-powered weapon binoculars and micro-binoculars were the basis for armed forces and news organizations at the time, making them affordable for everyone today.
As better binoculars hit the market at lower prices, it becomes important for you to understand the optical technology behind the professional extreme sports momentum and distinguish the difference of low-tech optical devices. In other words, it is inevitable to distinguish good and bad in markets where all kinds of advanced technology binoculars are available.