Ihagee EXA IIa, Manual

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7
Operating the lens
The lens (1) is interchangeable; press the
locking lever (18) towards the lens, turn the lens
to the left (Fig. 5) until the red dots (2 and 7)
are opposite one another and then lift off the
lens towards the front. For inserting the lens,
proceed in the reverse sequence; position the
lens with the red dots i line, then turn the lens
to the right until the catch engages. All types of
special lenses from those with the shortest to
the longest focal lengths may be employed. The
lens is focused by turning the distance setting
ring (5), which is scaled in both meters (lower
scale) and feet (upper scale). Whilst turning the
ring, look into the eyepiece (19) of the penta-
prism viewfinder (12) and adjust the focus by
means of the constantly upright, laterally-correct
and highly magnified reflex image (when em-
ploying the Fresnel Lens screen, it is best to use
the broad ground-glass ring in the center of the
image field, since this does not possess the fine
line structure visible in the rest of the viewfind-
er field). When the definition of the subject as
seen in the reflex image appears at its sharpest,
then the actual distance of the subject in feet
and meters will be shown on the distance-set-
Fig. 5