P: plastic PC lens
G: Glass lens
IR: IR-CUT filter
None distortion lenses usually use plastic aspherical lenses to correct the light path. Which is generally more difficult for glass lenses.
For lens with Plastic lens, please make sure the working temperature range within 0 ~ 50 degree to get stable image/video. At high temperatures, the plastic lens will be deformed and lose focus. The image will be blurred.
IR-cut filter is used to avoid color cast problem. By default CMOS sensor is sensitive to infrared rays, Although the human eye can't see it. And after converting it into electric signal, the red color will increase greatly, especially for the sensor with good night vision effect, which the infrared sensitivity is higher, the whole screen is reddish, and the sun shines outdoors. The color cast is more serious.
In order to avoid color casts, lenses that support infrared cutoff filters of 650 nm are commonly used.