Thermal imagers have also become passive night vision telescopes, which also require batteries. The imaging principle of the thermal imager is to image according to the temperature difference of the target, so it has nothing to do with the light of the target..night vision binoculars ， This means that the thermal imager can be used day and night.
Thermal imaging cameras are all digital, and the resolution and lens directly affect the viewing distance. Generally, the observation distance of thermal imager is 200-1000 meters.
Advantages and disadvantages of thermal imaging cameras: Thermal imaging cameras have a longer viewing distance than infrared night vision cameras and are not affected by the brightness of the target. But in the daytime, although it can be used, it is definitely not as good as a normal telescope.