Ihagee EXA IIa, Manual

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11
can be maintained throughout the duration of
the exposure period without having to keep the
release depressed by hand, with the consequent
danger of camera shake. 2. A locking knob
(avail- able as an accessory) can be screwed into
the release rocker and by propping up the lower
Part of the rocker will disengage the automatic
diaphragm mechanism. The diaphragm is then
stopped down by turning the diaphragm setting
ring ; the diaphragm will remain stopped down
according to the amount by which the setting
ring is rotated and the exposure can then be
made using the “T” setting of the shutter. In or-
der to check the depth of field during focusing,
depress the release rocker just far enough to
close the diaphragm down to the selected stop,
without releasing the shutter.
Operating the fully-automatic diaphragm
of the Meyer f2/50 mm standard lens (Fig.
9): Focusing is performed by turning the broad,
polished distance-setting ring.
Set the diaphragm mechanism for either fully-
automatic pressure-diaphragm operation or for
normal diaphragm setting as follows: red dot on
the front control ring pointing up- wards - pres-
sure diaphragm operation. White dot pointing
upwards: normal diaphragm setting (lens aper-
ture adjusted by rotating the diaphragm setting
Fig. 9