Slide the boundaries of the uncharted one, to see more and further to know the world around, touch the secret of his device - the desire of not one generation of people. To this end, the telescopes, pickle pipes and binoculars were invented and found. It is the latter that they found the greatest application in the life of tourists, fans of hunting and fishing, as well as just inquisitive people.
Compact devices are convenient, possess stereoscopic vision. In order for you to make the most use of binoculars, it is necessary to accommodately approach its choice.
We choose the type of binoculars
The solution in favor of binoculation of a particular type should be based on the purpose of the device.
Tourist binoculars
Compact devices for observation at any time of the day. 5 - 10-fold increase in size. Important criteria are convenience of use, a small weight of binoculars. The presence of a rubberized case will be an advantage.
Hunting optics
The main criteria of binoculars for hunting is a small size, high light, durable and stroyed housing. Also useful will be the image stabilizer, rangefinder, altimeter, compass, thermometer. The multiplicity of increase can be both greater (10 - 15) and less (4 - 7). In the latter case, the viewing angle will be greater.
Sea optics
An important features of binoculars of sailors and fishermen are a good horizon review and binoculars resistance to moisture. The multiplicity of zoom can be both high enough and medium - everyone determines the task-free task. Binoculars can have a built-in rangefinder with a compass. In this case, the models are already tactical.
Opera glasses
This type of binoculars has a small size, low weight and decorative design. The multiplicity of image increase is small - 2 - 5 times. Important parameters for this category of devices - the viewing angle (field of view should be wide) and light binoculars (the device must allow to see and under insufficient lighting).
Children's binoculars
Cognition of the surrounding world is doubly more interesting in hand with binoculars. For young children (up to 10 years), preference can be given models without the possibility of focusing. More elder researchers will suit simple models with focus. The maximum multiplicity of the increase, which is quite enough - 10.
Astronomical optics
A good alternative to the periscope for all who are interested in heavenly objects. Binoculars are distinguished by a large lens (110 mm) and high rates of zoom (10 - 30 times).
The choice of lens and the degree of increased binoculars
The most important characteristics of binoculars are the multiplication of the image and the diameter of the lenses.
- Multiplicity. This parameter indicates how many times the binoculars increase the size of the object. There is optics with a small (3 - 5), average (6 - 10) and a strong increase (10 - 30). The optimal and most common value is 6 - 10 times. Such indicators will be enough for amateur use and in the absence of special access control skills.
- Lens diameter. It is measured in mm and affects binoculars - the larger the diameter of the lenses, the more clear and clear image you will see. The importance of this parameter is especially increasing with insufficient lighting. The diameter of the lenses of the bulk of models varies within 30 - 50 mm.
Field of view binoculars
Determines the width of the review at a distance of 1 km from you. To convert a linear field of view (meters) to degrees, the amount obtained is divided by 17.4. It should be remembered that with greater multiplicity angle of view (field of view) less. Therefore, if an optics of 30 and ahead in the hands, then the binoculars should be sent to the observed object.
Diameter of the output pupil binoculars
The parameter characterizes the size of the image transmitted in the eyepiece. "Comfortable" value - 2 - 3 mm (human pupil size) during the day and 6 - 8 mm in the dark. The optimal value is 5 - 7 mm. To determine this value of a particular model, the ratio of the diameter of its lens to multiplicity should be calculated.
Prism binoculars
In all types of binoculars, excluding theatrical models, there is a roof prism or a Porro-prism. The latter gives a brighter and contrast image, applied in models with separate focus. The first is more compact and light, but also more expensive.
Focusing binoculars
The focus setting can be centralized and individual, manual and automatic. The possibility of separate focus (separately for each eye) is relevant if the eyes have different visual acuity.
Case binoculars
The main criteria that determine the quality of the body is its moisture resistance, resistance to impact and fogging. The need for a particular quality is determined by the operating conditions of binoculars.
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