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Pulsar Digital NV Forward DN55

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Pulsar Digital NV Forward DN55 Details

 

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Pulsar Digital NV Forward DN55 Specifications

ManufacturerPulsar
SKU78115
Digi NV Clip-on seriesPulsar DN
Variable magnification

Variable magnification

 

Optical products with variable magnification are more versatile as they're designed with a wider range of magnification and larger viewing angle. With their high number of lenses in housing, optics with variable magnification are larger, heavier and have lower permeability of light. Variable magnification is rarely present in binoculars, but it's mostly used in riflescopes and spotting scopes. Advantages of the variable magnification regarding usability with riflescopes and spotting scopes outweigh disadvantages – in short one fits all. High quality variable binoculars are very rare.

 

No
Magnification

Introduction

 

Magnification is an optical parameter which enlarges/zooms the viewing image and makes the observed object seem bigger. For example, with magnification factor 10 we see objects 10 times larger, which means if an object is 0.1 m high and 100 m away we see it 1 m large. In other words, it’s the same observing the object that's 100 meters away with a 10x binoculars as watching it with the naked eye 10 meters away. In choosing the right magnification for fixed magnification optical products, practice shows that the most useful magnifications are between 7x and 10x, where average people seem to handle optics without too much hand tremor.

Magnification

Source: ZEISS

Fixed magnification

 

Optical products with fixed magnification are designed in a way that they allow only one magnification of a viewing object. Due to a smaller number of lenses used in their construction, they are optically brighter and have lower loss of brightness. The number of lenses contributes to its smaller size and lighter weight in comparison to optics with variable magnification. Most of binoculars tend to have fixed magnification, whereas with riflescopes it’s getting rarer each year. Normally this kind of optical products are easier to use and cheaper. They also offer better optical performance, especially in terms of light transmission rate.

 

Variable magnification

 

Variable magnification simply means that the optical product is designed in a way where you can change magnification of a certain area. This consequently changes the viewing angle, where higher magnification means smaller/narrower viewing angle and lower magnification means wider viewing angle. Variable magnification adds to versatility and general usefulness.

 

10x
Lens diameter

Lens diameter

 

Lens diameter represents the second value in product’s name/designation. For example, 10x42 optics have 42 mm diameter of the lens at the front (those that are closer to the viewing object). It is known that the bigger the lens, the more light goes through and the image we see is brighter. All of this, however, depends on the magnification and quality of a certain optical product. Although the bigger lens diameter in binoculars is better, the size adds up on the weight, making it more heavy and difficult to handle. With riflescopes, bigger size of a lens diameter also means more problems with mounting.

The most common lens diameters are 24 mm, 42 mm, 50 mm and 56 mm.

Lens diameter

Source: ZEISS

50 mm
Lens apertureF1
Field of view

Field of view

 

Field of view is an area you see when looking through the optical product. Although it primarily depends on the build of the eyepiece, it is hugely affected by magnification. If you look through two binoculars of the same model but with different magnification, you can see that the one with lower magnification factor will have a wider field of view. So when comparing binoculars, you must compare the ones with the same magnification. With riflescopes the field of view is being measured at 100 m, while with binoculars, spotting scopes and other optical products it's measured at 1000 m.

With binoculars a field of view with more than 140 m at 1000 m distance is considered a wide angle, while with riflescopes it is with a field of view over 38 m at 100 m. Wide angle is particularly useful in bird-watching.

It is also important to mention that the size and lens diameter of optical products are not indicators of their field of view - bigger housing doesn’t automatically mean wider field of view.

Field of view can be expressed in two values – degrees or meters.

Degrees:

One degree is 17.5 m at 1000 m / 1.75 m at 100 m.

If you divide the field of view given in meters by 17.5 you get the field of view in degrees.

Meters:

If you multiply degrees with 17.5 you get the field of view at 1000m.

Field of view meters

Source: Lovec

8.7 m/100 m
Field of view (deg.)

Field of view

 

Field of view is an area you see when looking through the optical product. Although it primarily depends on the build of the eyepiece, it is hugely affected by magnification. If you look through two binoculars of the same model but with different magnification, you can see that the one with lower magnification factor will have a wider field of view. So when comparing binoculars, you must compare the ones with the same magnification. With riflescopes the field of view is being measured at 100 m, while with binoculars, spotting scopes and other optical products it's measured at 1000 m.

With binoculars a field of view with more than 140 m at 1000 m distance is considered a wide angle, while with riflescopes it is with a field of view over 38 m at 100 m. Wide angle is particularly useful in bird-watching.

It is also important to mention that the size and lens diameter of optical products are not indicators of their field of view - bigger housing doesn’t automatically mean wider field of view.

Field of view can be expressed in two values – degrees or meters.

Degrees:

One degree is 17.5 m at 1000 m / 1.75 m at 100 m.

If you divide the field of view given in meters by 17.5 you get the field of view in degrees.

Meters:

If you multiply degrees with 17.5 you get the field of view at 1000m.

Field of view degrees

Source: Lovec

Apperent field of view (deg.)

Apparent field of view (deg.)

 

The apparent field of view is a value in degrees that represents the viewing angle of an image you see through the eyepiece. Two binoculars that share the same magnification, lens diameter and field of view don’t necessarily have the same apparent field of view, because it depends on the structure of the lenses inside an eyepiece. It’s simply a subjective impression of the field of view.

Apparent field of view is also depending on the eye relief distance. Shorter eye relief means wider apparent field of view. But if comparing two different binoculars with the same eye relief, the one with the larger eye lens in the eyepiece will have larger viewer field.

It can be calculated by multiplying the actual field of view with the scope’s magnification. Higher value is better as it makes the image appear wider and bigger.

Apparent Field of view

Source: Nikon

-
Close focus

Closest focus distance

 

Closest focus distance is an important value when watching butterflies, moths or plants at a really close distance. It represents the nearest distance where the viewing object can still be in focus. With binoculars, an excellent viewing distance is from 1.5 m below. If you’re not particularly interested in watching objects at a close range this is an irrelevant factor when choosing a new pair.

-
Diopter range

Diopter range in optics with one ocular (riflescopes, spotting scopes, NV optics, …)

 

Diopter range is an adjustment on optical products which can correct the prescription on each of your eyes. That way you can see a sharp image without wearing glasses. The diopter ring is normally located on the eyepiece and by turning it your image appears sharper.

Every optical product has different diopter range, from positive (+) to negative (-).

Diopter range in binoculars

 

The diopter ring is present in central focusing system on each of the barrels near the eyepiece, where you can correct the difference in the prescription of the left and right eye individually. Once you have set the right value, you can focus the image with using just the central focusing ring. If you’re wearing glasses, the diopter value should be set to 0, because the differences in your eyes are already corrected in your glasses.

To see a sharp image without wearing glasses you can easily set the diopter by looking with bare eye, turning the ring and adjusting sharpness. So when looking with both eyes your image should appear sharp. If you have astigmatism the diopter adjustment cannot correct it – you’ll still need your glasses and diopter set to 0 to see sharp images.

Diopter Range

Source:Nikon

-
Sensor type

Sensor type

First, you need to know that every digital camera (including digital night vision devices) has the main part that captures the light coming through the lens to form an image. This part is called a sensor. Mainly, a sensor is a solid device which captures the light and forms it into a digital image that you see in the other end on the screen. There are lots of different sensor types built in digital devices.

CMOS Sensor
The most commonly used sensor is CMOS (Complementary Metal-Oxide-Semiconductor). CMOS uses the latest technology which enables very high integration on the microchips with high performance and miniaturized integrated electronic circuits.

CCD sensor
CCD or charge-coupled device sensor was produced before CMOS sensor. Latest technology CCD image sensors are used in professional, medical and scientific devices where high-quality image data is needed. For devices, where you don’t need a high-quality image, such as professional digital cameras and so on, CMOS sensors are usually used. So digital night vision devices with CMOS sensors are cheaper then devices with CCD sensor, due to CMOS uses a newer and cheaper technology.

Thermal imaging sensors

Thermal imaging devices use special sensors or infrared (IR) detectors that detect Long Wavelength Infrared (LWIR) band from 7 μm – 14 μm. An IR sensor is the heart of any thermal imaging device. The Most common IR sensors (detectors) available today are sensors which are cooled or uncooled. These special IR sensors are built out of quite exotic and expensive materials such as sensing pixel array, IR ROIC (Infrared Readout Intergraded Circuit), vacuum package and back-end electronics.

Cooled IR sensors were developed in the 1950s for military application use. Disadvantages of this type of IR sensors is that they require additional accessories to obtain operating temperatures between -70 and -150 °C, what makes thermal imaging device bigger and heavier. These extra cooling accessories are also expensive, they use a lot of power and they require a cooling-down time process, which takes around 10 to 20 minutes to get the first image on a thermal imaging device. Mostly those thermal imaging devices are used in the military (mostly in military transport) because they need a higher performance technology that enables longer distance detection and don’t need a device that gives you instant-on image. 

Uncooled IR sensors are commonly microbolometer based sensors, the development started in the 1990s. There are 2 most common types on the market – microbolometer made out of Vanadium Oxide (VOx) or Amorphous Silicon (ASi). A big advantage of uncooled IR sensors are they are cheaper then cooled IR sensors and don’t need extra cooling-down accessories, what makes these thermal imaging devices portable, lightweight and they have low battery power consumption. They also provide an instant-on image, what means, you are able to see your image until the battery runs out (no cooling-down processes). The disadvantage of uncooled IR sensors are, they are less sensitive, have lower performance and speed of constant detection of the image then cooled IR sensors.

Vanadium Oxide (VOx) microbolometer (uncooled IR sensor) and Amorphous Silicon (ASi) microbolometer (uncooled IR sensor) are the two main types of microbolometer. Both are designed to work in the same way (core technology of both is similar), but the main difference is of what material is the sensor built of.

Pulsar CMOS sensor

Source: Pulsar (CMOS sensor)

-
Sensor resolution

Sensor resolution

Sensor can detect smallest change in the quantity that is is measuring, this tells us resolution of a sensor. Usually, resolution of sensor output is equivalent to image resolution and screen resolution output. Accuracy of sensor can be much worse than its resolution. Characteristics of a sensor has a big influence on resolution of unit.

Mainly in digital imaging any resolutions (sensor, image, screen) are measured in pixel count or number of total pixels. For example, when you see in the specification resolution 500 x 582, this means 500 pixels in width and 582 pixels in height. Another measurement you get when you calculate pixels in width and pixels in height – 500 x 582 = 291,000 pixels or 0.29 megapixels.

Pixels size and amount of pixel defines displays resolution. The size of 1 pixel in the display is described by pixels per inch (PPI). The smaller the size of pixel and larger the number of pixels the higher the resolution. The higher resolution, the better the quality of image.

Pulsar CMOS sensor

Source: Pulsar (CMOS sensor)

500x582
Range of detection

Range of detection

One of the first questions when buying night vision optics is »how far away can i see?«
Range of detection is the distance on which you can detect / see 1.7 m high object.

Always have in mind that there are many  different things that influence on how far you can see looking through night vision optics. For example, if the object is larger it`s easier to see. Another outside impact is lighting condition, the more light reflecting from moon, stars (ambient lights), the further and also better you will see. Range of detection is given at average conditions.

Range of detection also applies to digital night vision and thermal imaging devices.

armasight NV

Source: Armasight

400 m
Automatic Brightness Control-
ControlDigital
Built-in IR illuminatorLaser
IR Illuminator wavelength

IR Illuminator wavelength

Before explaining IR illuminator wavelength, you need to know what is the meaning of these words separately.

*Visible spectrum is a part of the electromagnetic spectrum visible to human eye. Electromagnetic radiation in this area of wavelengths is called visible light or simply light – measured in nanometers (nm).

First word IR stands for infrared. *Visible spectrum of human eye is somewhere between 400 and 700 nanometers (nm) wavelength. While infrared is over 750 nm, which is outside of visible spectrum of human eyes, that means that our human eye cannot detect an infrared source (its invisible to our eyes). Night vision devices can detect IR light. So, infrared (IR) Illuminator provides light over 750 nm wavelength. There are 2 different types of IR illuminator – LED or laser and 2 types of night vision devices – analog or digital. Why is this important to know? Different IR illuminators provide light with different wavelength and works on different types of night vision devices.

The main difference between analog and digital night vision device is that digital type works with all wavelength ranges, analog works only under around 900 nm wavelength.

Laser IR illuminator wavelength from around 780 nm to 810 nm works fine on generation 1, 2, 3 and digital night vision devices. But the problem is, animals can detect wavelength up to 850 nm, because of that, IR illuminators with a wavelength up to 810 nm are not recommended for hunters.

Laser IR illuminators with wavelength of 850 nm doesn’t work properly with generation 1 night vision devices, but work well with gen 2, 2+ and gen 3 NVD. IR illuminators with wavelength from 850 nm upwards are suitable for hunting purposes.

Laser IR illuminators with wavelength from 875 are made for generation 3 and digital night vision devices.

Remember, analog night vision devices can´t detect wavelength over around 900 nm. IR illuminators with such wavelengths are suitable only for night vision cameras and other digital night vision devices.

IR illuminator

Pulsar F155 (IR illuminator)

915 nm
Equivalent IR Power-
Display type

Display type

There are 3 main types of displays on the market – LCD, OLED and AMOLED.

LCD or Liquid Crystal Display is cheaper and also lower quality compared to OLED and AMOLED. LCD is built out of more component layers what makes him thicker against newer displays. Manly, LCD is made up of special liquid crystals that get illuminated by a fluorescent backlight.  The quality of the image is lower, they show a lack of contrast (black color appears as gray), consumption of power is consistent and it’s not affected by the color on the screen. Compared to other displays, its better under direct sunlight.

OLED or Organic Light Emitting Diode. Its built out of fewer component layers then the LCD, what makes it thinner. OLEDs thin-film display is built out of organic material. When current passes through it emits light. On OLED you get much better black color. It consumes less power when displaying darker colors.

AMOLED or Active Matrix Organic Light Emitting Diode is a step up from the OLED display technology. Its driven by a special TFT technology. TFT plane activates on receiving electrical currents while TFT arrays are acting as switches for each pixel. Advantage against LCD is they are thinner and more flexible. AMOLEDs have faster refresh rate, no restriction on size display, higher contrast ratio and consume less power when darker colors are displayed. AMOLED display shows poor image under direct sunlight. When brighter colors are displayed, it consumes more power. Organic material has a shorter lifetime. AMOLEDs have even fewer component layers, what makes them thinner than OLED.

 Putting all together, LCD technology has been around for a while, while AMOLED is a newer on the market and it uses newer technology. AMOLED is a better version of OLED. AMOLEDs and OLEDs are better against LCDs since they bring a better image quality, have faster refresh rates, higher contrast and resolution, more brightness, better viewing angles and are lighter and more flexible.

display type pulsar amoled

AMOLED display (Pulsar FXQ 38)

OLED
Screen Resolution

Screen resolution (Display resolution)

Screen resolution or display resolution defines a size of display measured in number of pixels and size of each pixel.

Mainly in digital imaging any resolutions (sensor, image, screen) are measured in pixel count or number of total pixels. For example, when you see in the specification resolution 500 x 582, this means 500 pixels in width and 582 pixels in height. Another measurement you get when you calculate pixels in width and pixels in height – 500 x 582 = 291,000 pixels or 0.29 megapixels.

Pixels size and amount of pixel defines displays resolution. The size of 1 pixel in the display is described by pixels per inch (PPI). The smaller the size of pixel and larger the number of pixels the higher the resolution. The higher resolution, the better the quality of image.

Pulsar FXQ 38

AMOLED display (Pulsar FXQ 38)

640x480
Image CaptureNo
Image Resolution-
Video recordingNo
Video resolution-
Video outputYes
Auto-TurnOff

Auto –TurnOff

Some of the red dots and rifle scopes with reticle illumination have Auto – TurnOff function. This means, in case that you forget to turn off illumination or when you leave your firearms on table (you don’t do any movements with rifle scope), illumination automatically turns off. The time when illumination turns off is different from rifle scopes to rifles scopes.

Many of the expensive and high quality rifle scopes with illuminated reticle have an Auto-TurnOff smart motion sensor that detects different angles and automatically turns OFF or even ON the illumination of the reticle, based on the rifle scope position.

This is a nice feature to have, because this increases the battery life. 

auto turn-off

Source: Swarovski

-
Power SupplyAA
Battery life-
Filled with

Filled with

 

Optical products are often filled with dry gas to prevent the condensation on the inside of the housing when exposing them to temperature extremes. If there is even a slight sign of air inside, there is a certain % of moisture present. Usually they’re filled with either argon or nitrogen gas, which have the same effect – to prevent the moisture and internal fogging without affecting the optical properties. In addition, these gases also prevent the formation of fungus which would destroy the optics. Internal dewing was the biggest problem in older binoculars when exposed to lower temperatures, because they weren’t watertight and contained air. Newer binoculars are therefore all airtight and filled with dry nitrogen or argon.

Nitrogen
Waterproof

Waterproof

 

Waterproof feature is made to keep the optical products sealed and protected from water or dust. Such products are suitable for marine, hunting, hiking or in extreme humidity. Even if you’re not planning on using them in this kind of situations, it is a good feature to have in case of heavy rain or dust. Waterproof optical products are typically sealed with O-rings.

All optical products that are fogproof are also waterproof, because they have to be properly sealed to keep the dry gas inside. Yet not all waterproof products are fogproof as the air inside the barrels is not necessarily replaced with dry nitrogen or argon.

You should be careful not to confuse waterproof with weather-resistant as they’re designed to protect only against light rain and are not fully sealed.

Slightly better waterproofing of binoculars can also be ensured with an individual eye focusing mechanism, due to less moving parts than with the central focusing system.

Yes
Relative humidity-
Fogproof

Fogproof

 

Fogging in optical products can occur when you move them from the warm insides of your house to the cold outdoors. To prevent the formation of inside fogging they’re often filled with dry gas – either nitrogen or argon which contain no moisture.

To keep the gas intact on the inside, the optics have to be properly sealed, which is why all fogproof optical products are also waterproof.

It’s important to keep in mind that fogproof means that it’s to prevent fogging on the inside of the optics, not on the outside. If your outside surface of the lenses fogs up due to temperature differences or humidity just allow them to adjust back – do not wipe the condensation off as it can be damaging to the glass surface and its coatings.

Yes
ShockproofYes
Shock resistance-
Temperature range- 25 / + 50°C
ColorBlack
Length246 mm
Width82 mm
Height117 mm
Weight810 g
In production since-
Warranty2 years
Made inBelarus
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