Optical Adjustments To Range Finder - Kodak Medalist II How To Service

OPTICAL ADJUSTMENTS TO RANGE FINDER.
NOTE:
It is preferable to correct opti-
cal defects (figure 21) in the range finder
system in the order named .
ONE FIELD IS SMALlE R THAN THE OTHER.
This condition is due to tilting of the erecting
prism forward or backward, usually caused by a
severe jar to the camera . The focus of one or both
fields may also be affected.
Remove the two range finder eyelet frame screws
(figure 5) and the parallax frame assembly . Then
fasten the range finder eyelet lens assembly in
place again with the two range finder eyelet frame
screws.
Loosen the erecting prism retaining screws (fig-
ONE FIELD SMALLER THAN
THE OTHER
A SHADOW IN ANY OF THE
OUTSIDE EDGES
EITHER FIELD OUT OF FOCUS
DIVIDING LINE TIPPED
/
VERTICAL LINES TIPPED IN
ONE FIELD
DIVIDING LINE TOO THICK
HALVING INCORRECT
16
PART OF TRIANGULAR TEST
OBJECT MISSING
PART OF TRIANGULAR TeST
OBJECT APPEARS IN BOTH
FIELDS
Figure 21
-
ure 22) on either side of the erecting and coincidence
prism assembly; special tool No . 501-C will be
found convenient for the right-hand screw . Tilt the
prism assembly forward or backward until the di-
vidingline is centered up and down and the two fields
are of equal size. After tightening the retaining
screws, put a small amount of shellac on the heads
to prevent the screws from working loose.
Again remove the two range finder eyelet frame
screws, replace the parallax frame assembly, and
replace the eyelet frame screws .
DIVIDING LINE TIPPED.
This condition
is
very similar to that described
in the paragraph above. Instead of tilting forward
or backward, the erecting prism has tilted sideways .
Make the adjustment in the same manner and be
sure to shellac the heads of the retaining screws to
prevent recurrence of the trouble.
A SHADOW IN ANY OF THE OUTSIDE EDGES.
A shadow may be due to bending of the range
finder reflection guard (figure 6) so that it is cutting
into the beam of light. If the reflection guard has
not been bent, make sure that the range finder re-
flection guard screw is tight and is not allowing the
guard to slip out of position in any direction. In
this case, tighten the screw and shellac the head
to prevent it from working loose again .
If
no obstruction can be located in the affected
beam, the erecting prism may not be perfectly lined
up with the coincidence prism. Loosen the two
erecting prism retaining screws, adjust the erect-
ing prism so that it is the same distance from the
coincidence prism at both sides, and tighten and
shellac the screws .
VERTICAL LINES ARE TIPPED IN ONE FIELD.
Lines are Tipped in Lower Field.
If
the lines are tipped clockwise as shown in
figure 21, use special tool No. 501-E to tighten the
large end prism bracket screw (figure 22) on the
end prism assembly .
In
most cases
it
will be neces-
sary to tighten the screw only very slightly. If no
result is obtained, loosen very slightly the center
one of the three smaller end prism bracketscrews
directly above the large screw. Working the two
screws in conjunction with each other, straighten
the vertical lines. After making the adjustment,
shellac both screw heads . If the lines are tipped
counterclockwise, follow the same general proce-
dure, but tighten the upper sc rew, and
if
necessary,
loosen the lower one.
Lines are Tipped in Upper Field.
If
the lines are tipped clockwise, tighten slightly
the small end prism bracket screw in the center of
the right end prism assembly mount directly above
the large end prism bracket screw. If no result is
obtained, loosen very slightly the large screw and
work the two screws in conjunction with each other
to straighten the vertical lines. Then shellac both
screw heads.
If
the lines are tipped counterclock-
wise, follow the same general procedure, but tighten
the lower screw, and
if
necessary, loosen the upper
one.