Thermal camera lenses have low power supply and use two types of infrared rays: near-infrared or short-wave infrared, with a wavelength of 0.76-1.5㎛, which penetrates deeply into human tissue, about 5-1mm;
Far-infrared or long-wave infrared, with a wavelength of 1.5 to 400㎛, is mostly absorbed by the superficial skin and penetrates the tissue to a depth of less than 2 mm. Enhanced nighttime image capture. Therefore, most users need the infrared zoom lens to pursue strong thermal camera lenses effects.
The real infrared night vision device is a photomultiplier tube imaging, which is completely different from the principle of the telescope. It cannot be used during the day, and it is expensive and requires a power supply to work.