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MIL-T-46386A(MU)
this spread to be measured on the panoramic telescope reticle.
4.7.2.1.4 Cleanliness. - The panoramic telescope shall be tested for
cleanliness by using the shadowing techique outlined in MIL-O-13830. At
the conclusion of this test, dirt particles shall not exceed the limits
outlined in 3.5.
4.7.2.1.5 Image tilt. - With the panoramic telescope and fixture
positioned as outlined in 4.7.1, image tilt shall be observed by sighting
through Collimator F5549108 aligned to the optical axis of the eyepiece
assembly and note parallelism between its vertical reticle line and the
vertical line of the collimator target. Both lines shall be parallel
within the limits provided on the projected target (collimator reticle)
to assure conformance with the 3.7.2. Repeat this test with the elbow
assembly against each of the stops to assure conformance with 3.7.1.4.
Again observe parallelism between the reticle lines. Repeat this test
at eight different azimuth counter settings in 6400 mils of rotation.
Each setting in azimuth will require the azimuth fixture plate to be rotated
an equal amount in an opposite direction to permit reestablishing the
line of sight to the position observed in 4.7.2.1.2. All readings are
to be within the limits outlined in 3.7.1.4.
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 instruments
vertical reticle line to the projector collimator's vertical reticle line
and observe where the opposite end of the panoramic telescope verticle
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 collimator'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 Dwg 7680631. Adjust the dioptometer
eyepiece assembly to the dioptometer's reticle until a clear sharp image
appears on the dioptometers 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. Patallax 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 3.7.7.
12

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