ZEISS IKON CONTAFLEX I Instructions For Use Manual page 8

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Setting the Aper tu re
Depress the button (8) and at the same
time rotate the black milled ring (7) carry-
ing the aperture scale until the required
aperture number is opposite the index (9).
If
necessary, the diaphragm can also be
set to intermediate values. When making
some consecutive exposures it is recomm-
endable to check the setting before each
exposure. As the aperture ring clicks into
position at each setting, you can eve n set
the aperture in the dark by touch only.
In
that case start from one end position