Kodak CGP - Manual (Page 2)

Exposure
Relative Exposure Index
Exposure Orientation System Pulsed-Xenon Tungsten or Quartz-Halogen
To emulsion ISO (ASA/DIN) 20/14 20/14
These indexes are provided primarily as indicators of the relative speed of this film when compared with
other Kodak graphic arts photographic materials. The pulsed-xenon value indicates the film's relative
speed to pulsed-xenon illumination as measured by a light integrator. Index numbers for the other light
sources can be used with photoelectric exposure meters to help establish trial exposures. A 2-times
film-speed increase is indicated in the ASA system by doubling the index number and in the DIN system
by increasing the number by 3.
Examples of Camera Exposures
• Line Exposure: For a same-size (1:1) line reproduction exposing with four 1500-watt pulsed-xenon
lamps at 3 feet (0.9 metre) from the center of the copyboard, use a trial exposure of 8 seconds at f/22.
• Halftone Exposure: Make a trial exposure using a contact screen suitable for use with Kodak Camera
2000 films.
Example of Contact Exposure
Exposing with a variable voltage point-source lamp operated at 16 volts at a distance of 5 feet (1.5
metres) from the exposure plane—approximately 4 footcandles (43 lumens/square metre), use a trial
exposure of 6 to 11 seconds (with a 1.0 neutral density filter), to the emulsion.
Filter Factors
When a filter is used, multiply the amount of unfiltered exposure by the filter factor shown below.
Because lighting conditions vary, these factors may require adjustments.
Light Source Kodak Wratten Gelatin Filter
No. 8 No. 15 No. 47B No. 58
Pulsed-Xenon 1.5 2.0 12.0 4.0
Quartz-Halogen 1.5 2.0 20.0 2.5