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Page Title:
Parallelism of image and reticle |
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|  MIL-T-50782(MU)
re-establishing the line of sight to the position observed in 4.7.2.1.2.
All readings are to be within the limits outlined in 3.7.2.
4.7.2.1.5 Parallelism of image and reticle. - With the panoramic
telescope positioned as outlined in 4.7.1, align one end of the instru-
ments 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 reticle line. Both lines must conincide wihtin the
limits specified in 3.7.3.
4.7.2.1.6 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
eye-piece assembly to the dioptometer's reticle until a clear sharp
image appears on the dioptometer's optical axis. Next direct the
dioptometer'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 and set the
diopter scaloe to zero. 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
adjustments to be within the limits of 3.7.4.
4.7.2.1.7 Parallax. - Using the set-up outlined in 4.7.1, parallax
will be tested after the distance specified in 3.7.5 has been set into
the projector colimator. The test is performed by aligning a reticle
line or mark near or on the optical axis of the telescope under test to
a similar line or mark on the projector collimator reticle. There shall
be no apparent movement beyond the limits of 3.7.5 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
3.7.5. Use the thickness of the reticle line to measure apparent move-
ment.
4.7.2.1.8 Reticle accuracy. - Angular separation between the two
40 mil graduations may be determined by aligning one of the panoramic
telescope's 40 mil graduation to the corresponding mark of the projected
reticle or wall targert. This alignment may be attained by activating
the elevation and azimuth knobs. Observe coincidence between the other
40 mil graduation of the panoramic telescope and the corresponding mark
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