Night vision heads for optic sights

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Day sight.
Experienced hunters provide their weapon with professional day sights of the leading producers; they are assured in the production quality. Most of all shots use daily optics, they know it in details and get used to it with the current of time, and they feel self-assertion while shooting at long distances at the aim. They have become adherent to a certain sight type and rarely change it. In order not to break comfort and to have a feasibility of continuing hunting at night, nowadays it is possible to turn any favourite day sight into the night one without its remodelling. In this article we will tell you how to do it.
As the first purpose is not to touch a construction of the sight, there are only two ways to remodel it – either to mount a night vision monocular back to the day sight or to mount it in front of the day sight. Let us examine two ways of doing it.

Mounting of the monocular back to the day sight.
For night vision monoculars D125, D126, D126 pro, produced by R&M Company “Dipol”, special transition brackets MK123, MK124 are produced.
accessories_5These brackets are mounted to the monocular of the day sight and are fixed with a special device with plastic rings that don’t damage a monocular. They are easily demounted. Night vision monoculars are fixed to the objective from the other side of the bracket. All night vision monoculars, made by R&M Company “Dipol”, have an eye relief of 37-40 mm, it allows to aim and shoot. Of course, it couldn’t be compared with the eye relief of 70-90 mm of the regular sight, but it’s up to a person to decide, as today it is a maximal one.
Constructors think about the consumer, about the difficulties that may arise while mounting and demounting of the night monocular. On different transition brackets it is done in different ways – easily and rapidly. For example, a transition bracket MK124 gives an opportunity not to disconnect a night vision monocular from the day sight at all. It is equipped with a suitable rotation mechanism that allows to put a night vision monocular aside from the eyepiece of the day sight and to fix it automatically parallel to sight housing.

dn34hr_1Transition brackets MK123 and 124 are completed with a wide variety of plastic rings that allow to fix them to eyepieces of almost all types of the existing day sights.


Cons of such a scheme:
– pupil distance of the day sight is usually 70-90 mm. Length of night vision monoculars D125, D126 pro is 133-136 mm, that considerably lengthens all the optic construction and requires either lengthening of a butt or shifting of the sight to the barrel as closely as possible. For a butt lengthening rubber strips can be used. Shifting of the sight is possible due to the bracket construction, besides the adjustment is likely to become out of order. In any case, when reducing the eye relief a person should control himself while shooting and not to bring an eye close to the eyepiece of night vision monocular in order to avoid injury.
– as a rule, day sight optics is estimated on the basis of the day specter of lightwaves (400-650 nanometers). Night vision devices usually operate in the night specter of lightwaves (650-900 nanometers). Lots of given sights have a small relative aperture. For the night vision monocular there may be not enough light flux, let through the sight, for good image quality. That is why a monocular or the whole system should be provided with infrared laser illuminator.
Pros of such a scheme:
– heads are easily and quickly mounted.
– a unit doesn’t require any additional settings and adjustment (without shifting the sight).
If to take separately, day sight and night vision monocular are devices for observation of high quality. Monocular is mounted to the helmet and functions as night vision goggles (close range device). The objective of the monocular is changeable and can be replaced for a monocular with greater factor in order to use a monocular as a long range device. All these changes can be made in several seconds, besides the advantages of the versatile device (three in one) are easily observed.
Mounting of night vision monocular in front of the day sight.
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R&M Company “Dipol” produces a special night head (monocular) DN-34 for mounting in front of the day sight. Mounting of the night vision head in front of the day sight can be made in 3 ways:
A head is installed to the standard mount for optical sight, if the dimension of the mount and sight allows. The head is mounted to the day sight objective with the help of a special transit bracket. The head can be mounted to the internal thread of the objective of the day sight.
Correct and coaxial mounting of night vision monocular in front of the day sight is of great importance. If a monocular is mounted at the back side of the sight, it gives an image from the eyepiece. If your sight is mounted correctly, the image in the monocular cannot disable the whole system. And a monocular mounted in front of the sight forms the image, let to the day sight, itself.
If the optical axle of the night vision monocular mounted in front of the sight, won’t coincide with the optical axle by the angle (parallel shifting up to 3 mm is allowed), you won’t aim even with ideally adjusted standard day sight.
It is also important to remember that optimal magnification of the day sight while operating with monocular-head in front is in the range of 2x – 6 times.
The most reliable method used by military is mounting the monocular in the front with the help of fixing it to the mount. Famous American company IIT informs about the possible fault while demounting and mounting of the night vision monocular (angle minute). Such preciseness may be reached only due to ideal production of the attached mount and its hard fixation on the weapon. Some companies claim about the fault not more than 1 minute, though it’s hard to believe it.
It is fairly considered that a method of twisting the monocular in the objective of the day sight. But most of sights have either not enough depth of the thread or it doesn’t exist at all. That is why this method is not widely spread.
Attaching of the night monocular by means of special transit clamp is too critical. Most companies while producing day sights don’t pay attention to the preciseness of coincidence of optical and mechanical objective axles. And they are right, for aiming it doesn’t play any role. For a day sight exactness of the optic section, adjustment and resistance to the kickback but not the ideal coincidence of axes of the external objective diameter to optics are important.
For attaching night vision monocular producers deliver a set of compressor rings. It is very important to choose the right size of the plastic ring. If the ring is smaller or bigger for 0.5 mm than the external size of the objective of your sight, the possible fault of aiming will reach 5 minutes! Night head of R&M Company “Dipol” DN-34 is completed with the help of 22 rings with 1 mm step, that allows to mount it to all well-known sights with the external objective diameter 40-62 mm. For reliable fixation 2 special clamps for mounting from 40 up to 50 mm and from 50 up to 62 mm are included in the delivery unit.
While mounting night vision monocular at the back side of the day sight, kickback “pushes” a monocular to the day sight.
While mounting night vision monocular in front of the day sight, kickback vice versa “puts” a monocular off the objective of day sight. While experimenting on the special shock stand (load 500g), a monocular climbs down after 75-100 shootings, as a rule. To prevent climbing down of the night monocular you should fix the clamps when mounting it. Only R&M Company “Dipol” has mounted to the bracket special clamps, that closely cover the objective of the day sight. A lever of the clamp allows to fix a monocular on the objective, if to make comparison with the analogues. But after 50 shoots you should test fixation of the monocular on the objective of your sight.
If optic axis of your day sight doesn’t coincide with the mechanical one then while mounting a monocular with the help of a clamp you won’t be able to shoot an aim.
Only R&M Company “Dipol” has given the opportunity of such an adjustment if to turn to night vision monocular DN-34, supposed to be mounted in front of day sights.
It is also important to mount night vision monocular in one position. It allows to reach minimal shooting fault while remounting the monocular to 1 angle minute.
SPF “Dipol” has experienced its night vision monocular DN-34 on the sights made by famous German and Austrian producers. As the result of demounting and mounting of 10 various night vision monoculars DN-34 with the help of special clamp, maximal reticle withdrawal in one of them constituted 1.5 minutes, what corresponds to the bullet shift for 4.4 cm at the distance of 100 m. The average number of withdrawal constituted not more than 1 minute.
Cons:
The main disadvantage is difficulty of coincidence of head and sight axes, and, as a consequence, error of aiming.
A great number of European carabines have a front sight closely located to the objective of the day sight. As a rule, it doesn’t give to mount a monocular in the front side. Monocular construction of the head made by R&M Company “Dipol” has minimal dimensions in the axled direction.
– it is hard to focus the mounted monocular. It is situated not far from the butt. R&M Company “Dipol” offers suitable focusing of the objective up to the stop within 30 degrees rotation. Operating distance of a monocular – beginning from 12 m and endlessly. If to choose position endlessness you may observe things at the distance of 150 m. Control service is situated also far. It is difficult to switch it on. R&M Company “Dipol” offers transit switcher attached to the battery part (AA – 2 pcs.) with the possibility of fixing on the day sight somewhere near the eyepiece, that brings comfort of switching it on.
Pros:
A monocular is situated in the front side and it picks up the light. It doesn’t require extra powerful illuminator. Eye relief of the day sight eyepiece is widely used. A usual indicator is preserved, and it increases exactness of shooting. A monocular having high aperture optics is located in the front side and it picks up the light. It doesn’t require extra powerful illuminator and due to this fact it damasks a hunter.
In the conclusion, we want to say that there are no absolute and common decisions, and we are glad to present new feasibility of choice to our clients. A choice depends on various factors: construction of the system – weapon-bracket-sight and hunting conditions, preferences of the hunter and his financial feasibilities. For example, in Europe night heads are popular because of the ban to use to use night sights. In the USA the demand is many-sided and is formed by the military, special departments, and hunters. In our country these devices are absolutely new and the experience of their usage is not big, that’s why we have made up our mind to narrate about them in details.