DIC UNUM VENEN ESSEN
The Stereometric Camera SMK 5.5/0808 is an instrument adjusted for close
ranges, of which two types exist, namely the SMK with base 1200 mm for
8 m and that with base 400 for 4 m focus distance. Table 2 shows the most
important characteristic data of the terrestrial-photogrammetrical ta-
king lenses,
2» The calibration techniques
2.1 Aerial Cameras
The method employed in connection with the aerial cameras MRB has like-
wise been reported in detail elsewhere [5] (6|. The calibration is carried
out photographically on a pnchromatic photoplate with a so-called mul-
ticollimatore This has 17 collimators, which with space directions in
increments of 8 gon cover & plane angular field of 128 gon, With the
aid of an additional device space directions in increments of 4 gon can q e
be realized for calibration of normal angle cameras, The measurement
of the collimator marks on the photographs is made on the precision mono-
comparator Ascorecord of VEB Carl Zeiss JENA, which enables the measu-
ring values to be read to sel fle
The actual distortion values may deviate from those of the standard
curve by Lom and for the largest field angles by +10 um. These devi-
ations inclüde an systematic portion due to manufact inaccuracies,
which can be determined according to the Seidel theory of third-order
aberrations [1] by the polynomial expression
A (Art) = a, or'+a pU (1)
Here r' is the radial distance of the measuring points, a, and a_ are
constants, Function (1) can be determined from the distortion defiati-
ons from the standard values by adjustment according to the least squa-
res method, An evaluation of the measuring results of the Lamegon PI
4.5/150 has shown that after such a calculation the still remaining er- T
rors are on an average of 0,5 to 1 um and maximally 1 or 2 um, which is
quite an agreeable result for analÿtical-photogrammetric evaluations.
Also the other lenses mentioned here may be treated in the same way.
2.2 Terrestrial-photogrammetric cameras
There are two types of these cameras: those adjusted for a fixed object
distance and those with variable focussing. These two types include ca-
meras which are invariably adjusted for "oo" or a close range, while
those with variable focussing have or have not the possibility of set-
ting to "oo", The manufacturing programme of VEB Carl Zeiss JENA in-
cludes the following types:
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