Ihagee EXA IIa, Manual

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values which are not engraved on the scale. The
desired aperture value must be set opposite the
red mark.
In order to ensure that the release button on the
camera is always depressed sufficiently to re-
lease the shutter, an adjusting screw is provided
on the lower side of the lens release plunger so
that the latter can be set to the required length
by means of a screwdriver.
When using the fully-automatic spring di-
aphragm the lens is always used at its full
aperture for focusing and observing the reflex
finder image. It can then be stopped down to
the preselected smaller aperture (working aper-
ture) just by pressing the release. The working
aperture at which the exposure is to be made
is selected by means of the diaphragm setting
ring. By pressing the release knob on the lens,
first the diaphragm closes down to the prese-
lected smaller aperture and then the camera
shutter is released. By taking your finger off the
lens release knob, the diaphragm automatically
opens up to its maximum aperture; the knob
should, therefore, not be released until the
shutter has closed completely (this is particularly
important when using the slower instantaneous
speed settings). For taking time exposures the
lens should be set for normal-diaphragm opera-
tion ; the cable release can be screwed into the
release knob on the lens.
For checking the depth of field during focusing
when the lens is set for automatic diaphragm
operation, the release knob on the tens should
be depressed just far enough to close the dia-
phragm down to the desired aperture without
releasing the shutter.
The f 2/50 mm Jena Pancolar lens is provided
with automatic depth-of-field indicators; once
the aperture and focus distance have been se-
lected, the two red pointers indicate the extent
of the depth of field or sharp zone. By observ-
ing the black or white guide sectors in which the
red pointers are positioned and following them
along the edge or down the center as appropri-
ate, the near limit of the depth-of-field zone can
be read off on the left-hand side of the distance
scale and the far limit on the right-hand side of
the scale. For example, if you set your lens to f