What Is IR Photography?

Infrared photography is a relatively different way of shooting. Using infrared light sensitive equipment and infrared filters to take pictures that are different from the traditional black and white color photos, the pictures are shocking; at the same time, infrared light is relatively visible to some materials And clothing has the ability to penetrate (thin chemical fiber, smoke, water vapor ...), can shoot magical perspective effects, these characteristics have been widely used in military, public security, archeology, medicine and other fields.

Infrared photography is basically the same as ordinary photography technology, but it uses infrared light (700 ~ 1400mm) and matter to generate reflection, refraction, transmission, and infrared light imaging of the object itself. Therefore, it must use infrared-sensitive film. Infrared photography can reveal sights and camouflage that are invisible to the eye, detect natural phenomena that are incapable of visible light, and identify indistinguishable forms. It has been widely used in culture and arts, judicial public security, medical biology, remote sensing, astronomy, agriculture, forestry, industry and scientific research. In recent years, color infrared photography, infrared luminescence photography and infrared microphotography have been newly developed. ^[1]

Before the birth of digital photography, taking infrared photos required special

Digital camera ^[2]

In traditional infrared photography, because the film itself solves the problem of selecting the wavelength of light, no special filter is required when shooting. However, because the infrared wavelength is relatively long, the refractive index in optical glass is less than

Due to the drastic changes in infrared in nature,

According to tests, infrared light can reach more than 40% in natural light radiation, and can pass in black and white photography.

Infrared photography (2 photos)

A special filter is used to block visible light from red-dark red-dark red, so that the infrared image is sensitive on the film. For example, the "Rayden 87C" filter can block almost all visible light to produce a more pure infrared photography effect. This filter is almost opaque to the naked eye. In specific operations, you should adjust the focus before adding the filter. Take pictures for normal exposure. In general, you can use the "Rayden 25" red mirror for infrared photography, which can also produce a more obvious infrared effect. So what is the reason for infrared photography? Analyze the brightest objects that the human eye sees, such as the blue water surface and sky. They cannot reflect more infrared light. Although the imaging of ordinary black and white film is normal, the infrared film appears darker. Trees and grasses become white because chlorophyll can reflect infrared rays in large quantities, thereby achieving a surreal mood. Infrared light not only provides a special creative technique for photography, but also because of its high transmittance, it can also take clear shots in foggy days and smoke and dust. It is often used in scientific research for exploration and military reconnaissance. The use of infrared light has the characteristic of penetrating the surface layer of the picture and deepening the interior of the pigment, and it can also judge the authenticity of the famous paintings of the masters.