Basic Photography Course

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

contents

Basic Photography Course

<- previous page

next page ->


DOFMaster for Windows On-line Depth of Field Calculator DOFMaster for Mobile Devices On-line Depth of Field Table Hyperfocal Distance Chart Articles FAQ Recommended Books Support Contact Links Home As an Amazon Associate I earn from qualifying purchases.	contents <- previous page next page -> 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 contents Basic Photography Course <- previous page next page ->	As an Amazon Associate I earn from qualifying purchases.
	WWW.DOFMASTER.COM © 2006 Don Fleming. All rights reserved.