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Thermal imaging is gaining popularity since it offers great advantages for night-time observations. Especially the clip-on devices are widely used since clipping of the device on the objective bell of the day time optics is very simple and fast.
Usually, thermal clip-on devices have a lower sensor resolution
when compared to thermal rifle scopes, but clip-on´s offer all the
usability of the normal scope. This is especially handy when using the
same rifle for daytime hunting and hunting in the night.
Thermal clip-on´s are allowed for purchase in many EU countries where stand-alone thermal optics are not allowed. The price is also lower than the price of thermal rifle scopes, which makes them also more interesting for many hunters.
There are many advantages but also the disadvantages of thermal clip-on devices against night vision.
This is especially noticeable if the animal is in the forest behind dense vegetation
– with a thermal clip-on device these animals are easy to see and
almost impossible to see with a night vision device since the vegetation
reflects the IR light from the illuminator. With a night vision device,
only the eyes from the animal can reflect some light if it looks
straight towards you.
Here we get to another advantage of the thermal clip-on device – it does not need any additional IR light
in complete darkness. A night vision device does if there are no light
sources in the area (moon, stars, road lighting, etc.). An additional IR
light can, whatsoever, be visible for some animals, so they get scared
and can run away if an IR light under 850nm is used.
With the thermal clip-on colder objects
are more difficult to see, such as small trenches and grass. So, if you
are not very cautious about colder objects in front of the target, the
bullet can hit the obstacle and consequently miss the target. Also, the antlers on the animal are not well visible, so evaluating the game
can be very challenging or not even possible. With a night vision
device, if the animal is not too far away and the weather conditions are
good, it is possible to see the antlers perfectly.
In bad weather
such as rain and mist, it is almost not possible to hunt with a night
vision device. The rain and mist reflect the IR light, so you can´t get a
clear picture. With a thermal clip-on device, the picture has less
contrast, but animals are still clearly visible even at great distances.
Because of the flash when the shot is fired, the picture on an analog night vision
device can get white for a short time, so it is almost not possible to
spot the target after the shot. With a thermal clip-on device, this
effect lasts only a fraction of a second, so spotting
the target is much easier. Even if the animal runs into dense
vegetation, it can still be tracked with a thermal device. In most
cases, even the wound can be detected, so the user can immediately tell
if the shot placement was good.
Many thermal imaging devices have also the feature to take photos and videos. Analog night vision devices do not feature this function, but all digital night vision devices do. The resolution in analog night vision devices is much better, and they also drain less energy than the thermal devices.
There are several manufacturers that produce mounts for thermal clip-on devices. The most known company in the EU and the first one that started with such production was Rusan, but also SmartClip adapters are very popular.
These adapters are available in all different sizes, to perfectly match the objective diameter of all common daytime rifle scopes, for a tight and firm fit. For Pulsar Core devices, there is even a special interface that converts Pulsar's standard bayonet into a thread identical to Dedal's devices.