Advantages of infrared photography

According to the test, the infrared ray in natural light radiation can reach more than 40%. In black-and-white photography, special filters can be used to block visible light from red to dark red, so that infrared images can be sensitized on film. For example, the "Leiden 87C" filter can block almost all visible light and produce pure infrared photography effect. This filter is almost opaque to the naked eye, so you should adjust the focal length before adding the filter, and you need to shoot to get normal exposure. Generally speaking, "Leiden 25" red mirror can be used for infrared photography and can also produce obvious infrared effect. So what is the reason for infrared photography? The brightest objects seen by human eyes, such as blue water and sky, can't reflect more infrared light, so that although imaging in ordinary black and white film is normal, the color of infrared film is dark. The reason why trees and grasslands turn pale is that chlorophyll can reflect a lot of infrared rays, thus achieving an unrealistic artistic conception. Infrared ray not only provides a special creative technique for photography, but also can take clear photos in fog and smoke due to its high transmittance. It is often used in exploration and military reconnaissance in scientific research. Using the characteristics of infrared rays penetrating the surface of the picture and pigment, we can also judge the authenticity of the famous paintings of masters.