Kodak Medalist II How To Service page 19

NOTE: After an adjustment has been
made to correct tipped vertical lines,
it
will probably be necessary to correct
the halving also .
EITHER FIELD OUT OF FOCUS .
The focus of each field is controlled by the posi-
tion of its objective lens mountassembly . The left-
hand lens mount assembly controls the lower (sta-
tionary) field, while the right- hand lens mount as-
sembly controls the upper (movable) field. If it is
necessary to adjust the right-hand lens mount, the
focusingdialmut be removed. To make an adjust
ment, use special tool No. 601-D to loosen the two
objective lens mount nuts on the objective lens
mount assembly concerned and move it forward or
backward until the field is in perfect focus. After
making the adjustment, correct the halving as de-
scribed in the paragraph below, and shellac the nuts
to lock them in place.
HALVING IS INCORRECT.
The halving or height adjustment is best tested
on a triangular test object. When the halving is in-
correct, the sides of the test object will appear to
be broken even when the range finder is set for the
correct distance . This effect is due to incorrect
adjustment of one of the objective lens mount as-
semblies ; if there is too much vertical separation
between the two lenses a section of the triangle will
be missing, while if there is not enough, the same
part of the triangle will appear in both fields. See
figure 21.
Part of Triangular Test Object Missing.
Without loosening the objective lens mount nuts,
gently tap down the right-hand objective lens mount
assembly or raise the left-hand objective lens mount
assembly by gently prying it up with the blade of a
screwdriver . When the adjustment is correct, shel-
- lac the nuts in place. If any adjustment is to be
made to the right-hand objective lens mountassem-
bly, the focusing dial must be removed .
NOTE: Neither of the two objective lens
mount assemblies should be raised or
lowered to the extent that it is not rea-
sonably well centered in its front win-
dow on the direct view finder cover as-
sembly (figure 2). For this reason, it
is advisable to replace the cover assem-
bly temporarily before making the ad-
justment. The lens assembly which it
is preferable to adjust can then be se-
lected on the basis of its centering in the
front window.
Part of Triangular Test Object Appears in Both
Fields.
Follow the same general procedure as that given
in the preceding paragraph, but raise the right- hand
objective lens mount assembly or lower the left-
hand objective lens mount assembly.
DIVIDING LINE TOO THICK.
Severe climatic conditions sometimes cause
separation of the two triangular coincidence prisms.
If this is the case , replace the coincidence prism
assembly complete.
Too thick a dividing line may also be due to in-
correct position of the small aligning mask under
the view finder mask at the back of the direct view
finder cover assembly. Move the mask up or down
until the dividing line is of the desired thickness;
then apply a small amount of shellac to the mask
to prevent it from slipping out of place.
NOTE: Great care should be taken with
this adjustment because it may have a
tendency to affect the clarity and bright-
ness of both fields.
PRISM ASSEMBLY
Figure 22
17