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【Concept】 The use of photographic infrared radiation carried out. Usually through the use of infrared film and an infrared filter, but there are similar indirect fluorescent photography infrared photography. ============================== 【Principle terminology】 As infrared light, the photosensitive sheet is used for the absorption of infrared wavelengths from a sensitizing cyanine dye. Infrared spectral bands used in photography from 700 to 1300 nm range. Photography, plus home in front of the camera to black dark red color filter to filter out the sun's ultraviolet rays and visible light, infrared light source or the subject, sensitive film with only a small amount of red and infrared light exposure, and then by the general development process and get positive. ================================ 【Advantages Terminology】 1. The human eye to see the brightest objects, such as the blue water and sky, they do not reflect more infrared light, so although imaging in normal ordinary black and white film, showing the infrared film on darker colors. 2, because of trees and grass can be a lot of chlorophyll and white infrared reflection, in order to achieve the surreal mood. 3 Infrared not only provides for the creation of a special photographic technique, and because of its high transmittance, encountered fog and smoke can also shoot clear vision, often used in scientific exploration and military reconnaissance. 4 drawing surface using infrared penetrating deep inside the pigment characteristics, it can determine the authenticity of the great masters of painting. ================================ 【Common terms an auto-focus camera (AF)】 In the camera's AF function, the infrared active focus for the design (another commonly used on SLR cameras called passive auto-ranging focus) Using the principle of infrared distance measurement: In our half-press the shutter, emitted infrared camera is projected onto the object and then reflected back, so that the different objectives based on distance infrared camera on the acceptance point produce different voltages, AF receptors into electrical signals and then the voltage to drive lens to adjust the focus. ================================ 【"R" mark on the lens used term 2】 On most cameras lenses are engraved with a red "R" word or red dot, it is the infrared focus mark. Infrared light wavelength, the refractive index is smaller than the visible light through the camera lens, so that makes a focal point behind the normal bias point, how to pull it back to the normal focus point? Operation is normal after initially adjusted the focus, and then turn the focus slightly forward line to align "R" point, if the subject is far away, you can use the manual focus camera of course ignored infrared photography more appropriate. ================================ 【Common terms 3 Digital Infrared Photography】 ------------- 1 [basic principles] In fact, the basic principles of photography with infrared photography is generally the same, is the use of reflection in the camera image, the difference is just a different light in the visible and infrared light shines on the object through the lens to Bale. Sunlight contains a rich variety of light, of course, also contain infrared light, when the sun shines on the object reflecting into our eyes and cameras, in fact, we have already received infrared light, but we do not sense the optic nerve. ------------- 2 [Photography Principles] In fact, the camera receives the infrared light, it is not generally the same as the sensor film, the conventional infrared infrared photography depends on special film, and digital cameras use CCD or CMOS sensor to infrared can itself only in normal condition due to the visible light So far greater than the amount of light can not see infrared light infrared effects (Another reason is that many DC are equipped with IR cut filter). IR filter (Infrared Filter) role is to block visible light and infrared light passed so that, except for IR cut filter, this filter is used to block the infrared. After the installation of infrared filter in front of the lens, film or CCD will only see infrared light, which is a simple principle of infrared photography. ------------- 3 [Photography advantages] Digital Infrared Photography relative strengths of traditional infrared photography are: Traditional infrared film, and save your trouble (refrigerated), but also to a specific place rinse. Digital cameras can see the results on the spot, to help fix the parameters, no two cameras can interact simultaneously satisfy the general use of infrared photography! =============================
【Akon term】 Infrared photography often people even think of perspective. The so-called perspective is because the effect of some of the infrared through the visible light through without too much of the substances produced, there is a sufficient prerequisite infrared light can penetrate the outer layer, infrared filters filter out all visible light interference. As dark protective sheet on the infrared remote control in the sunlight filters plus a few into a transparent view is the best example. Some well-known perspective 0 Lux NightShot Camcoder photography is this truth. Perspective photography not only filters require very high, and camcoder itself would faint optical amplification effect is one of the conditions, the digital camera does not feature enhances the brightness of the above perspective effect is very limited. =================================
【Article is excerpted from: Web Search】 【Reserved Integrate / Just Reference】 【Translation is by The Network】 |
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