Cameras, ContinuedLightLight temperature becomes critical when reproducing color images and antemperatureimbalance light source will skew tonal values in black-and-whitereproduction. The most common lamps in Navy Graphics shops are thetungsten lamp, fluorescent lamp, and quartz iodine lamp variations.TUNGSTEN LAMPS: Tungsten lamps are excellent for use in black-and-white reproduction. Tungsten lamps are available as 3200 degrees Kelvin(K) and 3400 degrees Kelvin. Lamps rated 3400 degrees K are used lessbecause they have a short life of 4 to 6 hours.FLUORESCENT LAMPS: Use fluorescent lamps when the original has atextured or uneven surface and little reduction or enlargement. Evenillumination of a smooth-surfaced original is difficult to obtain. When youuse fluorescent lamps, arrange the tubes in a square pattern parallel to theedges of the copyboard.QUARTZ IODINE LAMPS: Quartz iodine lamps produce a very intenselight particularly suited to general copy work. They maintain a fairlyconstant color temperature throughout their life.ReflectorsReflectors evenly distribute light over the surface of an original, eliminatinghot spots. Reflectors also funnel more light toward the original that shortensexposure times. Certain types of lights have built-in reflectors. When youuse a lamp with a built-in reflector, also use a lens hood to shade the lensfrom glare and stray light.LampKeep all lamps clean and free of dust and finger smudges. Handle lampsreplacementcarefully. Replace all lamps in the system simultaneously. As lamps age,temperature variations occur. Failure to replace all lamps creates animbalance in temperature and intensity of illumination.Continued on next page4-36
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