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sun. atmosphere through which sunlight passes (fig. 1-12). longer wavelengths. The color composition of sunlight becomes increasingly deficient in blue the further the light has to travel through the atmosphere (early morning and late afternoon). As the sunlight becomes amount of scattering also depends on the condition of the atmosphere. When the atmosphere is clean (has little moisture or fine dust in it), there is less scattering than when the atmosphere is hazy or dirty (having a good deal color of sunlight can be expressed as color temperature. Sunlight coming from overhead on a clear day has a color temperature of about 5400 K. Just after sunrise and but the intensity is also less. These arc important considerations when taking pictures at these times of Skylight is different than sunlight because it is caused chiefly from the scattering of the shorter wavelengths. It therefore appears more blue than sunlight. Skylight direction, quality, and strength of the light. You can move these light sources around, diffuse them, or reflect them. You can alter their intensity to suit the situation. concentrated beam of light. Floodlights give diffused, softer, more even, spread out light. You can add to these two basic types of artificial light sources. By using lighting accessories, such as reflectors, barn doors, diffusers, and snoots, you can control the light to provide a variety of lighting effects. should not be mixed (used together). When you are viewing a scene, your eyes adapt so color differences between two or several light sources are minimized. Color film, however, cannot adapt and shows the color difference in parts of the scene illuminated by different light sources. for 3200 K or 3400 K. Tungsten lamps, operated at their rated voltage, produce light of 3200 K and 3400 K. The color temperature of tungsten lamps changes with voltage fluctuations, decreasing with lower voltage and increasing with higher voltage. For example, the color temperature of a tungsten lamp rated for operation at as low as 50 K can be noticeable on subjects with important neutral areas, such as white and light shades. power being drawn on the same circuit. When possible, you should avoid having other equipment on the same circuit. For these lamps to produce light of the correct color, they must be operated at exactly their rated voltage. When it is not possible to operate the lamps at their proper voltage appropriate filters can be used to correct the color of the light reaching the film. Basic Photography Course |
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