How to realize the night vision function of telescope

Telescopes cannot achieve night vision.

There are infrared night vision devices, low-light night vision devices, thermal imagers, special light wave imagers and so on. But the latter is slightly different from the former. The cheapest and cheapest price is also more than 1,000 yuan, and the most expensive one is several W. Moreover, it can't be used during the day, requires power supply, and the magnification is also low (ranging from 2 to 6 times).

You may be able to observe at night by listening to the so-called "red film" of the telescope, but this is actually deceptive and unreliable. The red film is the worst coating of the telescope, and 40% of the incident light is reflected, while the green film and the blue film are the best. Ordinary telescopes, whether military or civilian, can't realize night vision.