ZEISS IKON CONTAFLEX I Instructions For Use Manual page 11

Setting the distance
The built-in coupled rangefinder system
sets the camera to the correct distance.
When you look through the finder eye-
piece (20) you will see a clear circle en-
closed by a ground glass screen ring in the
centre of the field of view. This circle is
cut in two by a horizontal line (Figs. 4
and 5). You can measure the subject di-
stance in two ways:
1.
Sigbt a vertical line (e. g. tbe edge of
a wall, or a tree trunk) tbrougb tbe
finder.
On
turning the focu sing mount
(1) ,
the image
in
the upper half of tbe
circle will move relative to tbe lower
balf. When the two halves of the image
are exactly aligned, the lens is set to
the correct distance.
2.
if tbe subject shows no prominent ver-
ticals, observe tbe image in tbe ground
glass ring. Turn tbe focu sing mOlmt
(1 )
to or fro until tbis image on tbe ground
glass is pin sbarp.
11