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|  MIL-T-50384(MU)
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. Set zero diopters on the eyepiece of the
unit under test and align the dioptometer's optical axis to the optical
axis of the unit under test and obtain a clear sharp image of the 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 3.8.3. Rotate the telescope's eyepiece assembly and observe
the amount of rotation from the zero diopter reading for conformance to
the requirement outlined in 3.8.3.
4.6.2.7 Teticle plumb travel. - With the telescope positioned as
outlined in 4.6.2.2, observe where the intersecting point of the boresight
cross of the sliding reticle falls with respect to the intersecting point
of the projected reticle centerlines. By means of the range knob, activate
the boresight cross from reticle's geometric axis (20 mil graduation) to
each extreme of the mil scale and observe parallelism between this inter-
secting point and the projected reticle centerline. parallelism to be
maintained with the limits of 3.8.8.
4.6.2.8 Reticle shift. - With the telescope positioned as outlined
in 4.6.2.2, sight through the telescope and observe coincidence between
the intersecting point boresight cross and the projected center reticle
lines while rotating the range knob first in the clockwise and then
counterclockwise direction. Rotation of the knob shall not shift the
horizontal line of the boresight cross in excess of the limits of 3.8.6.
During this rotation of the range knob, also observe that the horizontal
line of the boresight cross does not shift from the zero range lines
when coincidence has been established as outlined in 4.6.2.2.
4.6.2.9 Parallax. - This test may be performed with the telescope
positioned as outlined in 4.6.2.2. Adjust the collimatot projector to
either parallax distance specified in 3.8.10. Sight through the telescope
and by means of the range knob, position the horizontal line of the bore-
sight on the geometric axis of the telescope under test (use 20 mil
graduation for location of geometric axis). Observe any apparent movement
between the intersecting point of the boresight cross and the intersecting
point of the projector collimator's center horizontal and vertical reticle
lines. Any apparent movement between these two points when the inspector's
head is moved up and down or from side to side is considered parallax. The
amount of movement shall not exceed the limits specified in 3.8.10. Re-
peat this procedure with the projector collimator set to infinity.
4.6.2.10 Resolution. - To perform this test, a wall target containing
the appropriate resolution target shall be employed. construction of the
resolution target and the method of inspection shall be as outlined in
MIL-O-13830. The telescope must resolve the test pattern within the
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