FAQ – Frequently Asked Questions

Hier finden Sie die Antworten auf die häufigsten Fragen

How do I check the firmware version of my device?

You can contact the Nitehog service team to check the firmware of your device.

Who can help me with problems regarding operating the device?

If you have questions or concerns regarding operating the device, please consult the FAQ section in your device manual or contact our service team. 

Do I need software or hardware to update my device with a newer firmware version?

If a newer firmware version is available for your device, you can send it to the factory for a firmware update free of charge.

How do I update my device to the latest firmware?

When a new firmware update version is available, you can send your device to Nitehog free of charge for a firmware update.

The picture is grainier than before

Make sure that the relevant filter in the device menu is switched on and the image settings are set to default values. Consult your device manual for more information.

The picture is blurry or unclear

Make sure that you are properly focusing  on the observed object and that the external optical surfaces are clean. Use the internal NUC function (N-Button)  to “update” the image processing. Consult your device manual for more information.

The picture loses contrast

Image properties may vary depending on the scene and weather conditions. Nitehog offers a sophisticated automatic gain and brightness algorithm that compensates for all scene variables. There are also manual setting options and a weather function. Take some time to adjust these values to enhance the image or to set the default values. Consult your device manual for more information.

The picture is too bright

Adjust the display luminance and the image brightness. Consult your device manual for more information.

Less details are visible in the picture

Try lowering the contrast value to make the details more visible. Increasing the contrast value ensures better object contrast and easier recognition. However, this reduces the details of the observed object. Consult your device manual for more information.

Which purchase criteria should you pay attention to?

Detector resolution

This refers to fine details and clarity of the thermal image. The higher the resolution, the more sensitive the elements (pixels) become. This also leads to a larger field of view and larger detection distances.

Pitch size

This refers to the size of the sensitive elements (pixels) on the FPA. The smaller the elements, the more compact the detector. This allows more elements to be placed on the FPA, which in turn enables higher resolution and a more detailed image.


This is a measure of the sensitivity of a detector to thermal radiation in the infrared terahertz or microwave range of the electromagnetic spectrum. It measures the amount of incident signal temperature that would be required to adjust the detector’s internal noise so that the signal-to-noise ratio equals one.

Lens focal length

The focal length of an optical system is a measure of how much the system converges or diverges light. For an optical system, it measures the distance over which the initially collimated beams are focused. A system with a shorter focal length has greater optical performance than a system with a long focal length. That is, it bends the rays more sharply and brings them to focus at a shorter distance.

F #

In optics, the f-number (sometimes called focal ratio, f-ratio, f-stop) of an optical system is the ratio of the lens’s focal length to the diameter of the entrance pupil. In optics, the f-number (sometimes called the focal length ratio, f-ratio, f-stop) of an optical system is the ratio of the focal length of the lens to the diameter of the entrance pupil.


Field of View – The field of vision (also field of vision, abbreviated FOV) is the extent of the observable world that is seen at a certain point in time. In the case of optical instruments or sensors, it is a solid angle that makes a detector sensitive to electromagnetic radiation.

What resolution do I need?

The choice of resolution depends on the client’s preferences and needs. Resolution refers to better image performance, including a more detailed image that allows smaller objects to be seen at greater distances. A higher resolution also means a wider field of view.

Was ist die Garantie für die Nitehog-Produktlinie?

Die Standardgarantie beträgt 2 Jahre und kann auf bis zu 3 Jahre beschränkte Garantie verlängert werden.

What is the difference between Caiman and Chameleon?

The main difference between these two devices is the focal length of the lens. The larger the focal length, the further recognition distances can be achieved.

Are the devices waterproof?

All Nitehog devices have IP66 protection, which means they are rain and weatherproof.

Can I use Nitehog thermal devices during day and night?

Yes, thermal imaging technology can be used day and night. Adjust the image settings (palettes, contrast, brightness, weather type) for optimal image performance. Consult your device manual for more information.


Can bright sunlight damage a thermal imaging camera?

Thermal devices can be used during the day but direct, focused sunlight through the lens can damage the detector. It is highly recommended not to point the lens directly at the sun.

Does a thermal imaging camera emit radiation and is it safe for the user?

Nitehog devices are completely harmless and safe.

Can the thermal imaging cameras recognize a person behind a wall?

No, thermal devices work with direct visibility and can sometimes see the heat signature behind very thin obstacles such as clothing, thin metals, and other thin materials that transmit heat. However, it is not possible to see through solid walls and other obstacles.

Can I see through glass with a thermal imaging camera?

No, normal glass is a barrier to the infrared waves and reflects them. So when you look at a window with a thermal imaging camera, you see your own reflection.

Does the device drain the batteries when it is switched off?

No, when the device is switched off, it does not drain batteries. However, it is recommended to remove the batteries when the device is not in use (for a longer period of time) to avoid possible battery leakage.

Can I use standard RCR123A batteries with Nitehog devices? Which batteries are recommended for Nitehog devices?

We strongly recommend that you only use batteries provided by Nitehog. There are many similar rechargeable batteries on the market, but with slightly different sizes (usually longer batteries) that can damage the contact springs and circuit boards in the battery compartment.

Can I use standard CR123 (non-rechargeable) lithium batteries?

Yes, Caiman and Chameleon devices work with 2x CR123 lithium batteries. Refer to the user manual for further instructions.

Can I charge my batteries while they are in the device?

No, batteries should be removed from the device and charged using the charger included in the delivery. Please refer to the user manual.

The battery compartment lid does not open, it is stuck.

Excessive force can break the battery compartment lid. Please carefully open and close the lid in order to prevent damage to the movable parts of the device.

The battery compartment lid cannot be closed

Make sure that the cap is correctly positioned, carefully use moderate force and rotate it in the direction indicated in the instruction manual.

The battery compartment lid is defective.

Send the device in for repair at the factory or contact your local dealer for a replacement battery compartment lid.

On which scope or camera can I attach a Nitehog front mount device?

When mounting a Nitehog device on a day scope / camera, you should consider the size of the outside diameter in order to select the correct mounting adapter (Rusan adapter). Please consult the your device manual and the manual of your scope / camera for the exact size of the outer diameter.

What do I need to be able to attach a Nitehog front mount device to a day view or camera?

You need to determine the outside diameter of the scope or camera and use the correct adapter to attach it to your Nitehog device.

With which weapon caliber can I use Nitehog's products?

17HMR, .223, .243,.270 Win, 7mm Rem, .30-06, .300 Win, .308Win, 9,3×62.

Does an attachment device have to be set to zero?

All Nitehog attachments have been designed and built with precision and a maximum deviation of up to 4 cm from the center of the daytime telescope in all directions, depending on the optical axis of the daytime telescope. However, to precisely align the optical centers of the two devices, you can use the special alignment function.

What targets could be used to zero the device in daytime visibility?

If the day view is already set to zero, all you need to do is check the accuracy. For this purpose, you can use materials that can easily absorb or give off heat, can be easily cooled, or reflect heat. This allows better contrast on the target while using the thermal device. Such materials are metal plates, heat stains, aluminum foil, bottles of hot water, blocks of ice.

Does the average hit point move when the device is removed and reattached to the scope?

No, the average hit point remains the same after attaching / removing the clip-on to the scope. If you have any problems with precision please contact your dealer or the local Nitehog team.

What is the field of view of the Nitehog devices at a distance of 100 m?

  1. Caiman TAU: 12.4×10 deg – 21.7 m bei 100 m
  2. Caiman X-Core: 12.4×9.3 deg – 21.7 m bei 100 m
  3. Chameleon TAU: 9.3×7.1 deg – 16.26 m bei 100 m
  4. Chameleon X-Core: 17.7×13.3 deg – 31.1 m bei 100 m

Images of hot objects remain on the screen (Ghost Images).

External NUC option is activated. To recalibrate the image, place the lens cap or your hand flat in front of the lens and press the “N” key or select the Internal NUC option from the menu and press the “N” key. Further information can be found in the user manual, section NUC (Non-Uniformity Correction).

The device makes a strange clicking sound.

The Auto NUC function is activated and executed every minute. To disable it, press and hold the “N” key.

Why do I need to calibrate the image?

If you lose contrast or focus, it is recommended to use the NUC function to “refresh” the image.

Is it possible to reduce or avoid the noise of the shutter operating during calibration?

Yes. The external NUC function enables a quiet NUC by deactivating the mechanical lock. In this mode the NUC algorithm is executed.

Do I need 30 Hz or 50 Hz?

The human eye cannot see a clear difference between the refresh rates of 30 Hz and 50 Hz. Nitehog Caiman and Chameleon devices work with an interlaced refresh rate of 50 Hz. Nitehog Python with a progressive refresh rate of 30 Hz.

How do I download photo files from a Nitehog device to PC?

Use the USB system cable, a laptop / PC and the Nitehog graphical user interface. For more information, see the user manual or contact your local dealer.

How can I choose a different palette color in a Nitehog device?

You can change palettes via the palette submenu in the image menu. Consult your user manual for further information.

Which color representation of the palette is recommended?

The Black Hot and White Hot palettes are the most preferred and easier to use, and we recommend them. The choice of palette depends on your personal preferences. For easier target acquisition at a distance of up to 100 m, we recommend the isothermal palette.

The stadiametric rangefinder shows incorrect distance values.

The SRF (stadiametric rangefinder) calculates rough distances depending on the object size. However, it is fairly accurate and has an approximate difference of 5 m at 100 m. One reason for an incorrect measurement could be the selection of the wrong object size from the predefined target objects.

How do you connect and turn on a Nitehog-provided Wi-Fi module and / or a Video Connect transmitter with a Nitehog device?

The Wi-Fi module and the Video Connect transmitter are connected to the device via a special Fischer connection on the right-hand side of the device. To start the Wi-Fi module or the Video Connect transmitter, simply switch on the Nitehog thermal imaging device after connecting it. Please note that the battery life may be greatly reduced when using a Wi-Fi module or a Video Connect transmitter, as both are powered by the thermal imaging device.

Do Nitehog devices heat up during long periods of operation? Is that normal?

It is normal for the device to get warmer when used for long periods of time or when it is exposed to direct sunlight.

How should the front lens be handled and cleaned?

The front lens should only be cleaned with the supplied cleaning cloth or the LensPen instrument. Alcohol or abrasives should not be used! They can damage the lens!

Nitehog GUI

The GUI ( Graphic User Interface) allows you to import any images from your Nitehog Device on to your computer. Furthermore, the GUI also allow you to change the settings of your device, when connected to your computer.

Technical Support Hotline (only for Dealers)

(Monday – Thursday
9:00 a.m. – 12:00 p.m. and 1:00 p.m. – 4:00 p.m.
Friday 9 a.m. – 2 p.m.)


You can leave a written request all around the clock, we will respond as soon as possible.

Repair Manager (RM)

If your device needs to be repaired, you can use our Repair Manager all around the clock.