The projection lenses (f = 110mm 1 : 16) have six components. The
condensers are advanced fresnel lenses, the lamps iodide 250 W, cooled by
blowers. The quality of the image may thus be as good as that of an instrument
with paraxial optics.
2 The F-2 Planitop, Carl Zeiss Oberkochen
(ref Schwebel, R ., The F-2 Planitop Topographic Plotter
Bul, special English Edition, 1974).
The principal aims of the instrument are the production and revision
of topographic maps. As such it seems to be the successor of the Stereotop, the
"approximate" instrument. It is a very small instrument, the required floor
space, even with external pantograph, is only 2.7 m? (without it, 0.7 m?! ). The
instrument has not much in common with its elder brothers the Planimat and
the Planicart. What it does have in common is that the photographs move for
tracking. The space rods are of the two-arm type. The rotation axes for w
are not excentric; the 0 -axes are excentric, but, unlike the other two instru-
ments, in the X-direction. This necessitates a (small) over-correction of q in
relative orientation.
To reach the larger map : model ratios mentioned in the table, the
external tracing table should be attached. The pantograph is of the same type
as is used for the B8 and PG2.
3 The Stereosimplex G6, Galileo Santoni
This newest plotter of Galileo, for small and medium scale, has some
properties in common with the Stereosimplex IIC. It was the designer's aim to
produce an instrument that could be manufactured at costs comparable with
the topographic plotters on the market. He has certainly succeeded in this, and
it is really one of the lowest priced of photogrammetric instruments. In the
table the instrument is compared with some of its competitors. Here we com-
pare it with its more expensive counterpart, the Simplex IIC. It differs in that
the mechanical photo-planes are situated between perspective centres and
model, as with the B8, the Planicart, and the Planimat. The principal distance
is set on one screw for each projector only, which makes it simpler for the
operator (the Simplex IIC has three screws, two of which are turned with one
key). The distortion compensation is by means of the usual Santoni cams.