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Figure 3-13
Aligning the exit pupil gage
(3) The mounting rails for the gage must be
flush with the eyelens frame. Check by holding
the bottom of the eyelens frame with the thumb
and apply slight pressure in the upper front of
the gage with the right index finger. The gage
should be secure.
NOTE : A left handed person may find it easier to
rerverse the mounting and securing process.
b. Point the camera lens at a light source while
holding the viewfinder eyelens (with gage)
about18 inches away from your eye.
c. Align the bottom of the viewfinder cap with
the horizontal white line on the front of the gage.
Center the eyelens supports with the vertical
Figure 3-14
Exit pupil images
lines (Figure 3-13).
d.Close one eye and view the exit pupil image
in the gage.
e. To be within acceptable limits, the pupil (a
bright circular image) must appear in the center
of the square opening in the face of the gage.
If the pupil is not in the center, adjust the optics
system according to instructions in Section IV
«Viewfinder Sytem».
2. Entrance Pupil Test
a. Set the focus wheel to 10.4''.
b. Hold the camera at arm's lenght, with the
taking lens toward you and a bright light source
behind the camera.
c. Look through the taking lens, closing one
eye. Observe the entrance pupil in the lens.
d. Raise the front of the camera about 10°
and note two bright circles against a dark
background. Both circles should be verticaly
positoned ±.050'' from the center as shown in
Figure 3-14 B.
e. If the circles are not centered vertically (Figure
3-14 A), perform the erecting link adjustment in
Section IV.
f. If the circles are displaced horizontally (Figure
3-14 D), make the side to side adjustment of the
Fresnel carrier which is included in Section IV.
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