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Distance
Scale
Distance Scale
The distance scale indicates the distance between the
focused subject and the film plane.
The scale is
neces·
sary for checking the depth ·of·field, for flash and infrared
photographies
.
• The correct position of the scale
is
in the center of
each value.
For example, the correct position of a
two·
digit value is the center of the two figures.
Infrared Index ..
R "
For infrared photography, correction of the distance scale
is necessary because the focal point slightly deviates from
ordinary photography.
Focus first in the ordinary manner,
then adjust that distance scale to the infrared mark" R
"
.
For instance
,
if the distance scale reads 10m after focus·
ing, merely shift the 10 scale to .. R" position.
The position of
..
R" on the TL is based on using film
with the highest wave·length sensitivity figure of 800mp,
such as Kodak I R 135 film and Wratten 87
filter.
Film Plane Indicator
In case the focusing is done by actual
measurement,
measure the distance from the film plane indicator and
interpret the measured distance on to the distance scale.
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