What is the principle of an infrared lens

Ordinary film cameras can also take infrared photography, but they must be equipped with special infrared photosensitive film and infrared filters. (Infrared lens) The CCD/CMOS sensor used in digital cameras/cameras (hereinafter collectively referred to as cameras) can sense infrared rays. In order to ensure that normal shooting will not cause color shift due to infrared interference, they are equipped with ICF in front of the CCD. Block infrared rays and pass visible light; just the opposite of ICF, the function of an infrared filter is to block visible light and let infrared light pass. The camera with night shooting function is to remove the ICF through a mechanical device so that the CCD can fully receive infrared rays! effect At the same time, it can filter and cut off visible light and allow infrared light to pass through. Through it, the infrared effect is separated in the environment where visible light and infrared coexist. There are a lot of infrared rays in the daylight, but the coexistence of visible light interferes with infrared photography and makes the picture excessively white. Therefore, an infrared filter is needed to filter the visible light to obtain a pure infrared effect. At night and other environments with low visible light, infrared filters (infrared lenses) are no longer needed. If you need to perform infrared photography at this time, you must configure high-power infrared lights for illumination.