How to Use Military Telescope?
The optical system of military binoculars varies. Most military binoculars have a dividing plate, and those used at night have a dividing plate with light illumination. The pupil distance of military binoculars is relatively large so that the observer wears a gas mask. In order to prevent the impact on the head when shooting, some scopes out of the pupil distance to seventy to eighty millimeters, but also equipped with soft and hard eye protection and forehead protection.
In terms of optical performance and structural performance, military binoculars are better and more reliable because of their more prudent design, superior quality of materials, sophisticated technology, such as good image quality, less stray light, and matching the magnification with the size of the pupil to achieve the best resolution.
Due to the high quality requirements, military binoculars in the factory are subject to environmental testing, including vibration test, high temperature (+55 ℃) test, low temperature (-45 ℃) test, rain or water immersion test, gas-tight test. After these tests, the product performance can still be guaranteed within the specified range before leaving the factory. Some products also come with a drier inside the mirror, the factory before the extraction of air and then filled with dry air or nitrogen, to effectively prevent future internal lens mold fog. Ordinary civilian telescopes generally do not do environmental testing, or only part of the test. This is difficult for people to understand from the market, only from the external appearance of the product can not be seen.
Mirror body group
The mirror body group is the main body of the telescope, divided into left and right mirror body, connected together by the connecting axis, its role is to support the upper and lower right-angle prisms, connecting the objective group and the eyepiece group.
Objective group consists of lens, objective barrel, etc. Objective lens group and the mirror body is connected together with a thread, its role is to receive the light of the distant object (or target) imaging in the focal plane.
eyepiece group consists of lens, eyepiece frame, and optics hand wheel. The eyepiece group and the mirror body are connected together with a threaded pressure ring, whose role is to magnify the image of the objective for the human eye to observe, turning the hand wheel of the visual degree can adjust the visual degree of the eyepiece to meet the requirements of different visual degrees of the human eye, the range is ± 4 diopter.
The connection axis is the connection of the left and right mirror of the telescope, and is also the pivot to realize the adjustment of the eyepiece distance in the range of 58-74mm, and the core of the binocular image.
Cover and Strap
The objective cover and eyepiece cover are designed to protect the objective and eyepiece lenses. The caps should be closed when the telescope is not in use to protect the lenses from damage. The strap is attached to the left and right mirror of the telescope, and can be hung around the user's neck when in use to prevent damage to the telescope from loss of hand.
How to Use
To use the telescope, the first thing to do is to mount the sight. Hold the telescope in your hand and look towards a distant target thousands of meters away. The left and right eyes are mounted separately, and the eyepiece is rotated until it is clear, remembering the number of divisions of the sight. Then set the eyepiece distance. Both eyes observe through the telescope, and trigger the telescope barrel, so that the two fields of view converge into a circle, at which point the number of divisions of the visual distance is the observer's visual distance. After using the telescope for the first time, you should remember your own visual degree and eye distance, and then you can directly set it when you use it. When using the telescope observation should be held with both hands, the two elbows clenched tightly against the chest, this posture is more stable, if there are fortifications or other dependencies, the elbow should try to support, especially the use of large magnification telescope. In snowy and foggy weather or strong daylight using binoculars, you can wear a filter to make observation clearer.
Military binoculars in the dense bit division can be used "on the interval, the next 1000, the dense bit, the distance between the two sides of the pendulum, to get that number, the diagonal multiplied by the neighboring side" formula, you can measure the directional angle, high and low angle and target distance. This is specifically described in the "military topography", which is a mandatory course for every officer or scout.
First, adjust the positive and negative diopter scales of the left and right eyepieces of the telescope to 0 scale. Hold the left and right mirror of the telescope with both hands, and search for distant targets while stretching or pressing the left and right mirror, so that the eyepiece distance of the telescope is the same as the pupil distance of the human eye (the human eye sees the full field of view as a circle), stop adjusting.
Object image adjustment
First search for the target, lock the target, turn the left eyepiece handwheel, so that the telescope left branch system target image and zoning image is completely clear, and then turn the right eyepiece handwheel, so that the right branch system target image is completely clear, then complete the adjustment of the observed target. Because the telescope optical path design has a dynamic automatic focus function, so when the telescope clarity is well adjusted, again observe the target at a different distance without refocusing.
When the ambient light is dim or when observing at night, it is recommended to use a telescope with a pupil diameter of 7mm or more. Because the pupil diameter of the human eye is about 2-3mm during the day and 6-7mm during the dark, the telescope can collect more light than the naked eye.