disadvantage, of course, is that the camera must remain on the tripod until both
exposures are made and prevents the use of the equipment for other purposes in
the interim. Polaroid film may also be used to good advantage in the day-night
technique. A Polaroid print is made during the daylight hours or at dusk. Then
from the same camera position, Polaroid transparencies may then be used as
overlays on the print to pinpoint enemy fire. Such imaginative use of Polaroid
materials shows again the many uses to which this versatile process may be put.
(c) Supplementary techniques.
It is not always necessary for the
photographer to wait for changes in order to make comparative photographs...the
cameraman can himself initiate changes which will vastly aid photo-interpreters.
To do so he has to avail himself of such well-known techniques as infrared film
and filters. No lengthy explanation of infrared or filter theory will be covered
here. Knowing that infrared will lighten vegetation and that filters may be used
selectively to either darken or lighten any color, the tactical photographer will
immediately see that both techniques may be applied to almost any phase of ground
tactical photography.
Note is taken of infrared and filters at this time only
because photos made with either device are usually accompanied by another photo
of the same subject made on panoramic film without a filter.
Infrared
panoramics, etc. are often required, but unless the nonfiltered panoramic photos
accompany
the
infrared--enabling
comparison--commanders
can
glean
little
knowledge from them.
Figure 1-8.
Night flash recording photography
17
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