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Repro-Copying
For originals such as photographs which have tonal gradations, exposure is determined in the
usual way.
In the case of originals having strong contrast and no gradation, such as documents or line
drawings,
measure the brightness of the white portion of the original (if the original is predomi-
nantly black, a sheet of white paper may be substituted) after decreasing the film speed by four
marks. Or open up the lens about 1-1/3 stops.
Slide
Copying
For originals with continuous tonal gradations, determine exposure in the usual way by the
stop-down
method.
To
copy slides with letters or figures on a transparent background, decrease
the film speed four marks, or open up the lens about 1-1/3
stops.
In the case of transparent
figures or letters on a dark background, either increase the film speed five marks or stop down
the lens about
1-2/
3
stops.
Important:
The above are only approximate guidelines.
Exact
exposure determination is ex-
tremely difficult, especially with reversal color
films.
Therefore, it is
advisable
to make several
different exposures for each
subject
to be
sure
of getting one that is correct.
Fisheye-Nikkor Auto Smm
f/2.S
Because of
its
wide picture angle
(180°),
the Fisheye-Nikkor is
susceptible
to inflated exposure
readings due to direct sunlight. To
compensate,
open up the
lens
two stops.
22
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