tographs are
is bent to a
exist in the
sitive to red
ensitive neg-
lal, together
e color fil-
rays travel
interruption
the wave
A wood,
X be pene-
account of
appears in
ive exposed
e radiation
iled terrain
dual trees
anding out.
Yer, the de-
hip are re-
th absolute
jte of the
ect of the
e. Details,
1e panchro-
| very large
the middle
y had been
ie emulsion
| one, Zeiss
?( air which
7. Especial-
; totally or
ally, if the
tures taken
same focal
st case, the
in the sec-
object were
ince shot I
cm), Agfa
, an escort
dle, bridge,
onsiderable
minefield,
daries and
ice photos.
(671)
As a matter of fact, photo measuring in suitable pictures gave me as a rule better
results, than any rangefinder.
Optics with a smaller aperture, however, require proportionately long time
of exposure which is inconvenient for reconnaissance of fast moving objects.
According to that I
had to compromise be-
tween f : 25 and f : 6,
and in 1951 the result
of many experiments
was completed at AGA
by Mr. E. Aulin as a
four element lens cam-
era with a focal
length of 98,5" (250
cm) and an aperture
of f : 15. The lens is
designed for use main-
ly in the red and in-
frared parts of the
spectrum.
With a series of
slides, I showed the
new camera and pic-
tures taken with that
instrument at different
ranges, from only one mile to not less than 30
extremely long shot was ab
Channel between Dover a
Fig. 3. In spite of turbulence in the air this long distance shot,
19 miles away, clearly shows details of the escort destroyer
thanks to the small aperture used, f:25. The focal length was
118^ (300 cm). Photo: R. Thorén.
miles or 48.000 metres. This
out 5096 greater than the distance across the English
nd Calais. The details, for instance, chimneys and
windows of houses there, showed up pretty well in spite of this very great
distance.
Finally I showed the new Swedish built 250 cm camera folded for trans-
port, carried by one man.
To complete these my w
abstract about a paper to Commission VII on
and interpretation from an Army point of view,
ords on Long Distance Photography I read an
*Ground photo reconnaissance
and some questions connected
with this subject”, written by Major, Baron B. von Vegesack, Swedish Defence
Staff, Stockholm. This lecture was also illustrated with slides.
GROUND PHOTO RECONNAISSANCE AND INTERPRETATION
FROM AN ARMY POINT OF VIEW, AND SOME QUESTIONS
CONNECTED WITH THESE SUBJECTS
by
Major Baron B. von Vegesack, Defence Staff, Stockholm, Sweden.
A photograph speaks.
and describes the terrain it illustrates in a graphic way,
Introduction.
It gives a living impression, fixes itself on one's mind
and also makes it pos-
