Can I use RCR123A rechargeable batteries (voltage 3.7V) to power APEX sights? 

The use of rechargeable batteries is an extra option. Before using them, please consider the below listed peculiarities. The sight’s battery compartment is designed for non-rechargeable CR123A batteries. Please pay attention to the physical size of your rechargeable batteries – they are often larger than regular batteries, this does not allow the battery compartment cover to close properly.

The thermal sight shows correctly the charge of regular 3V non-rechargeable batteries (voltage range displayed is 6 – 7.4 V). When using rechargeables (voltage range 6 – 7.4 V), low battery indicator shows false readings: the sight will detect batteries as fully charged even upon extremely low charge level, when the sight is about to switch off.

It is not recommended to discharge a Li-Ion battery below 3V. A rechargeable battery without deep discharge protection degrades after several deep discharges, and the sight will keep discharging them since 6V voltage (two 3V rechargeable batteries) is taken as indication of fully charge.

To increase self-contained operation time, we suggest that you use external power supplies which can be connected to a special port in the sight.   
Is it allowed to use the sight attached to the mount with two screws? 

Yes. But before use please fix the mount with glue, and fix the screws with a thread sealant.
When shooting the battery compartment cover opens spontaneously. 

Most probably the cover has not been closed or has been wrongly closed. This may be caused either by the use of rechargeable batteries of larger size which do not allow the cover to be closed (see above) or due to incorrect sequence of operations when closing the cover. 

First, when the cover is removed, turn the knob to the closed position; herewith two spring driven latches appear on both sides of the cover. Install the batteries into the battery compartment, close the cover, press it strongly from upwards (you can push both zones under which the latches are located). The cover should be completely fixed (both latches should be able to fix in sight’s body, one can hear a click). You can easily check it when pressing the cover from downwards (see Pic.).


The most common mistake – the cover snaps only on one side (contact between the cover and the batteries is poor and power failure happens when shooting). 
The sight runs on external power but the batteries in the battery compartment discharge. 

In this case external power has the priority. Please note that upon full discharge of external power you will have to re-start the sight (the sight does not switch automatically to battery power).

Can I have a description of APEX reticles please? 

Please click on the links below to read the description of the APEX reticles:

 - Apex XD38 Thermal Sight Reticle Catalogue

 - Apex XD50 Thermal Sight Reticle Catalogue

 - Apex XD75 Thermal Sight Reticle Catalogue

Please let me know the size of reticles in the Digisight and Digisight LRF riflescopes. You can find information on the size of reticles in the Digisight and Digisight LRF riflescopes on our web site in the Reticle Catalog at (DOWNLOAD section on our web site).

Is it possible to deactivate the reticle in the Digisight and Digisight LRF riflescopes? No. This function is not available. During the video signal transmission from riflescope to video recorder the reticle is present in the video file.

I have lost a rubber eyeshade. Can you help me? Eyeshades, lens and eyepiece caps, battery containers, etc. are readily available from Yukon distributors.

There are various types and sizes of AA rechargeable batteries: NiMH (nickel-metal-hydride), NiCd (nickel-cadmium), NiZn (nickel-zink), and lithium (namely Lithium-Ion, Li-Po (Lithium-Polymer). Which kind of battery is best for the Digisight riflescopes? Every rechargeable battery has its advantages and disadvantages. Lithium batteries (Li-Ion, Li-Po, Li-Fe) have a nominal voltage of 3.3-3.7V. The use of such rechargeable batteries may damage a NV riflescope. The Digisight can be used with NiMH, NiCd and NiZn rechargeable batteries. NiMH batteries feature longer life (have increased number of charge/discharge cycles). NiZn batteries allow a riflescope to operate longer, although its service life does not exceed 300 charge/discharge cycles.

Can I power the riflescope with two AA Li-Ion rechargeable batteries rated at 3.7V each plus two conducting dummy batteries of the same size? Even though total voltage will exceed the limit by 1.4V, the riflescope will be operating. Upon battery discharge (until about 4V), the riflescope switches off. Li-Ion batteries normally have protection option (when voltage sinks to a certain level, the battery stops current feed (specific discharge value depends on actual battery)). It is possible that the riflescope may show fully charged battery until it switches off.

When zeroing the riflescope in the daytime, sometimes I cannot achieve a contrast image of the target (the image is overexposed). The Digisight is a night riflescope suitable for day operation. In case of frequent day use, you can eliminate exposure by drilling a 4-5 mm hole in the centre of the lens cap (you can also install a dark light filter on the hole).

I have not found information on the size of mounts in the user manual. The full list of mounts and their description are available at (DOWNLOAD section on our web site).

What are the different ways to record video footage on the Digisight and Digisight LRF riflescopes? You can use any video recorder that has a RCA plug. As an option, you can use the Yukon MPR Mobile Player / Recorder that is fully compatible with the Digisight riflescopes scope and supplied with a long cable designed to make videos. Also, we have a video recorder CVR640 featuring 640x480 pixels recording resolution and has a cable to record with the scope (user manual enclosed). During the video signal transmission from riflescope to video recorder the reticle is present in the video file.

Can I use the Digisight and Digisight LRF in the daylight without damaging it? Yes, you can. The scopes use a CCD chip resistant to bright light exposure.

Is it possible to upgrade the firmware of the Digisight N750 / N770 to obtain all functions of the Digisight N750A / N770A series? The riflescopes Digisight N750 / N770 and Digisight N770A / N770A differ not only by its built-in firmware but also by some electronic components. That’s why it is not possible to upgrade firmware of the previous riflescope models. 

Can I use Reticle Manager software for Digisight N550 to design and edit reticles for other models of Digisight series? The Reticle Manager is not to be used with the riflescopes Digisight N750 / N770 / N750A / N770A and Digisight LRF; it works with the Digisight N550 model only. You can download one of the reticles from “DOWNLOAD” section of our web site
I own a Quantum HD38. Is it possible to update its firmware to get automatic calibration function? No. The automatic calibration in the latest versions of the Quantum thermal imagers is realized due to the presence of the internal shutter, not available in the design of the Quantum HD38 unit.

I have connected the CVR640 video recorder to the Quantum HD50S unit and started recording. But I get a black screen instead of a video clip. Why does it happen? First of all, make sure that you have correctly connected the unit with the video recorder. If the connection is OK, check that you have activated the video output in the Quantum unit by selecting a video signal standard (PAL or NTSC).

Can I use a thermal imager to see through glass? No, there are no thermal imagers able to look through glass because glass does not let infrared radiation within 8-13ɥm pass.

Why do I need to calibrate the image? Calibration levels background temperature of the microbolometer and eliminates image flaws (such as vertical stripes, ghost images of objects etc.). Intervals between calibrations depend on operating time: the longer a thermal imager operates in continuous mode, the less frequent calibration is required.

Is it possible to reduce or to avoid the sound of shutter actuation when calibrating the sensor? The manual calibration allows you to calibrate the image absolutely noiselessly. To do this, cover the lens with a lens cap or with a palm of your hand before pressing the calibration button. Thermal imagers Quantum feature three calibration modes: manual, automatic, and semi-automatic.

Can I install the Quantum thermal imager on a rifle and use as a thermal riflescope? No, the Quantum monocular is not designed to be installed on a rifle and used as a riflescope.

Can the bright sunlight damage a thermal imager? It is not recommended that the thermal imager with open lens cap is pointed at powerful sources of energy (unit emitting laser radiation or the Sun), because it may negatively impact the accuracy of the thermal imager. Do not use your thermal unit at temperatures exceeding +50 °С as high temperature may damage the unit.

Does a thermal imager emit anything and is this radiation dangerous? Thermal imagers are absolutely safe because the unit itself does not emit anything but only receives and analyses the incoming signal (infrared emission from objects).

Can the Quantum see a man behind the wall? Based on its mode of functioning, a thermal imager is only able to see surface radiation of a body. The Quantum unit can detect cracks in the wall or defective thermal insulation but it is not able to see through the wall.

What is the service life of the Quantum imagers? The notion of the “service life” should be treated in an integrated manner (microbolometer, display, boards, buttons, shutter and other parts and joints). Manufacturers of components may include information on maximum service life in the technical specifications. Yukon Advanced Optics tests all parts and joints for nonfailure operating time before launching series production of its units. Every unit produced by our company is covered by a three-year warranty which includes free warranty service. Adhering to rules of operation may significantly extend unit’s life.

What is “refresh frame rate”? Refresh frame rate (measured in Herz – “Hz”) tells you how many times a second the thermal image is refreshed on unit’s display. Higher refresh rate makes observation of fast moving objects more comfortable. The lowest frame rate is 9Hz. It is important to know that thermal imagers with a refresh rate of 30Hz and 50Hz may have export limitations depending on the laws in your region.

During observation a light or a dark spot/circle sometimes appears in the centre of the display. Why does it happen? Is it a defect? The light or dark spot effect in the centre of the image in Quantum thermal imagers may appear if the objective lens is in unfocused position when observing objects with an even temperature background. This effect is either not present or insignificant when focusing directly on a certain object. The spot effect is due to the constructive peculiarity of the objective lens and is most visible in extreme non-operating lens focus positions when observing objects with uniform low temperature contrast, i.e. clear sky. This is not a defect.

Why is the image quality when using the scope at low temperatures is worse than at positive temperatures? Due to various thermal conductivity, objects (surrounding environment, background) under observation get warm faster at positive temperatures, which allows higher temperature contrast and, thus, quality of the image produced by a thermal imager, will be better. At low operating temperatures objects under observation (background) normally cool down to roughly equal temperatures, which leads to lower temperature contrast, and to image quality (precision) degradation.

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thermal imaging sights

Refresh rate: 50 Hz
Magnification: 3x...6x
Range of detection: 1600 m

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