Nikon Nikkormar FT3 - Sp Ecial Cases

EXPOSURE MEASUREMENT - continued
Special C Ises
Repro-Copying
For originals such as photographs which have tonal
gradation, exposure is determined in the usual way.
In
the case of originals having strong contrast and no
gradation , such as documents or line drawings, mea-
sure brigh tne
ss of the whit e portion of the original
(
if the original is predominantly black, a sheet of white
paper may be substituted) after decreasing film speed
by four marks. Or increase exposure about 1-1/3 stops.
Slide
Copying
For originals with continuous tone gradations, deter-
mine
exposure in the usual way by the stop-down
method . To copy slides with letters or figures on
transparent background, decrease film speed four
marks or increase exposure about 1-1/3 stops. In
the case of transparent figures or letters on a dark
background, either increase film speed five marks or
decrease exposure about 1-2/3 stops.
Important: The above are only approximate guidelines. Exact
exposure determination .is extremely difficult, especially with
color reversal rums. Therefore,
it is advisable to make several
different exposures for each
subject to be sure of getting one
that is correct.
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