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Processing Copy Films
Examining  Results

Photography (Basic) - Introduction to photography and other graphic techniques
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302.185 Figure  8-6.–Slide  duplicating  system. Regardless  of  the  equipment  being  used,  your  goals for  duplicating  transparent  originals  should  be  to duplicate, improve, or alter, as desired, the reproduction of the original. DUPLICATING  35mm  COLOR  SLIDES To  get  additional  copies  of  a  color  slide,  you  must either  make  several  exposures  of  the  original  scene  or make duplicates from the original slide. When the scene cannot  be  re-photographed,  the  only  alternative  is  to make  duplicates  of  the  original  slide. Other  than  making  a  number  of  duplicate  slides from an original, you can use the duplicating process to improve a photograph. The image can be made larger or smaller, the composition can be changed through cropping,  the  density  of  the  duplicates  can  be  changed from  the  original,  and  with  the  use  of  filters,  the  color of  the  reproductions  can  be  changed. In  most  Navy  imaging  facilities  a  camera  designed especially  for  copying  slides  is  used  (fig.  8-6).  This camera setup usually consists of a unit having a camera body and lens, bellows extension, light source, a copyboard, filter holders, and the necessary controls and switches.  When  slides  are  copied  with  a  slide duplicating camera, the slide is transilluminated. This is the  most  common  method  of  copying  slides. Exposure Whatever method you use to copy slides, you must make exposure tests. The original slide you choose to make  the  tests  should  have  average  density  and brightness and normal contrast. This slide should be retained as a reference slide. A full-frame slide of a color rendition chart (color checker) serves ideally as a reference slide. A color rendition chart allows you to visually or objectively compare a series of colors and densities of the original reference slide against the slide duplicate. To visually compare slides, you should use transmitted light and color viewing filters to judge the slides. The objective method is more accurate. A densitometer is used in this method. A densitometer is an electronic meter that measures the actual density of black-and-white  and  color  materials. Kodak  Ektachrome  slide  duplicating  film  is recommended  for  slide  duplication.  This  film  is manufactured to provide lower contrast, less filtration with   tungsten   lighting,   and   it   has   good   color reproduction   characteristics. The data supplied with the slide duplicating film or the  Photo-Lab-Index  provides  information  that  you  can use as a starting point for exposure tests. However, you should bracket the exposure at least one f/stop in one-half f/stop intervals on each side of the basic exposure. Slide  Handling The  original  slide  must  be  clean  to  produce high-quality duplicate slides. The smallest piece of dust or lint is magnified greatly when the slides are projected. Never touch a slide with your fingers. Handle the slides only by their mounts. Hold unmounted transparencies only by the edges. Dust or lint should be removed with low-pressure air or a camel-hair brush. If there are fingerprints or oily smudges on the slide, you can remove them with a soft, lint free pad or a piece of cotton dampened  with  film  cleaner. Slides should be placed in the slide duplicator base-side up. When you are duplicating the full frame 8-18







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