Figure 1-3. Typical enlarger setup
c. You should also have an assortment of lenses to cover different size negatives. The lens
focal length should be roughly equal to the diagonal measurement of the negative. No matter what lens
you use, be sure it is clean.
d. Voltage regulator. Stable, unfluctuating voltage is a must. Any fluctuations in the line
voltage to a tungsten lamp changes the output and color quality of the lamp. This in turn causes a color
shift in the print. The best type is the constant voltage transformer in the power line.
e. Safelight. Kodak Safelight Filter No. 13 (amber) with a 7 1/2-watt bulb, or Kodak Safelight
Filter No. 10 (dark amber) with a 15-watt bulb, should be placed at least 4 feet from the paper.
Light leakage. Because of the high sensitivity of the color printing materials, extraneous light
fogs the materials and degrades the product. Before you begin any color printing with existing
equipment, you may find it necessary to block minor light leaks even though they produce no significant
problems when you work with black and white materials. This can be done by:
a. Placing opaque tape over leaks.
b. Replacing or tighten molding around doors and windows.
c. Painting over windows, moldings, etc.