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Parallelism of image and reticle |
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|  MiIL-T-50382(MU)
4.7.2.1.6 Parallelism of image and reticle. - With the panoramic
telescope positioned as outlined in 4.7.1, align one end of the instrument's
vertical reticle line to the projector collimator's vertical reticle line
and observe where the opposite end of the panoramic telescope vertical
reticle line falls with respect to the projector collimator vertical line,
both lines must coincide within the limits specified in 3.7.4. Repeat
this procedure with elbow assembly against each of the extreme stops. Also
repeat this procedure at approximately eight different azimuth settings
6400 mils of rotation. Return the line of sight to the projector collima-
tor's target line after each selected azimuth setting by rotating the
azimuth fixture plate an equal amount in the opposite direction. All check
points are to be within the limits outlined in 3.7.1.4 and 3.7.4.
4.7.2.1.7 Eyepiece focus. - This test is to be accomplished by placing
a white background in front of the panoramic telescope window. Eyepiece
focus is to be measured using a 3 power dioptometer conforming to the
accuracies depicted on Drawing 7680631. Adjust the dioptometer eyepiece
assembly to the dioptometer's reticle until a clear sharp image appears
on the dioptometer's optical axis. Nest direct the diptometer's line of
sight toward a 500 feet distant target such as a smoke stack, edge of a
building, or some other well defined target image. Adjust the objective
assembly until parallax is removed. Parallax is defined as any apparent
movement between the reticle and target image when the head is moved from
side to side or up and down. Align the dioptometer's optical axis to the
panoramic telescope optical axis and obtain a clear sharp image of the
panoramic telescope reticle on the optical axis. Make all measurements on
the dioptometer by adjusting the objective assembly. Any and all adjust-
ments to be within the limits of 3.7.7.
4.7.2.1.8 Parallax. - Using the set-up outlined in 4.7.1, parallax
will be checked after each of the distances specified in 3.7.9 has been
set into the projector collimator. The test is performed by aligning a
reticle line or mark near or on the optical axis of the projector collima-
tor reticle. Observe this positioning, there shall be no apparent movement
between the selected lines or mark when the observer moves his head from
side to side or up and down. Reticle displacement shall not exceed the
limits outlined in 3.7.9. Use the thickness of the reticle line to
measure apparent movement.
4.7.2.1.9 Reticle accuracy. - Reticle accuracy may be assured by
aligning the intersecting point of the panoramic telescope's vertical and
horizontal reticle line to the corresponding intersecting reticle lines
of the projector collimator. Adjustments may be made by means of the
panoramic telescope's azimuth and elevating mechanisms. When coincidence
has been established, observe where the 80 mil graduations of the panoramic
telescope's horizontal reticle line falls with respect to the corresponding
reticle line of the projector collimator. They must coincide within the
limits of the reticle tolerance mark to assure compliance with 3.7.10.
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