(e) With the transparency removed, take a light meter reading of
the ground glass of the viewer with the meter held against the ground glass.
(f) Set the meter for the white card index of the film being used
and compute the exposure.
(g) With a densitometer, read the density of the maximum highlight
area of the original transparency.
(h) From the duplication table (figure 6-2), obtain the exposure
factor (this compensates for the difference in density of various
transparencies).
Figure 6-2.
Density range and exposure factor table
(i) Compute the new exposure with the following formula:
Basic exposure x ratio of enlargement or reduction x exposure factor = new
exposure.
Example: Old exposure = 1/10 of a second at f/32
Ratio factor = 4 (1 to 1 enlargement)
Exposure factor = 2.0
1/10 x 4/1 x 2.0/1 = 8/10 or 4/5
Therefore, the new exposure is 4/5 of a second at f/32.
(j) Place the transparency on the viewer.
(k) Be sure that the correction filter is over the lens.
6-4
SS0514
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