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|  MIL-T-50384(MU)
3.8.5 Image tilt. - With the telescope positioned as in 3.8.1, the
image of a plumb line over the full field of view shall be vertical with-
in one degree.
3.8.6 Reticle shift. - Changing the direction of rotation of the
reticle knob shall not cause the horizontal line of the boresight cross
to exceed the tolerance specified in 3.8.2.2; nor shall the boresight cross
shift in azimuth in excess of 0.05 mil.
3.8.7 Resolution. - The resolution on the optical axis shall be
five seconds of arc or less.
3.8.8 Reticle plumb travel. - With the telescope positioned as in
3.8.1, the line of sight through the boresight cross of the sliding
reticle shall track a plumb line within plus or minus 0.5 mil, (total
lateral spread not to exceed 0.5 mil) when the reticle is depressed by
rotation over an excursion of 60 mils as read on the mil scale of the
reticle lens.
3.8.9 Parallelism of reticle and image. - With the telescope
positioned as in 3.8.1, the vertical line of the mil scale shall be
parallel to the image of the plumb line within 30 minutes.
3.8.10 Parallax. - With the boresight cross positioned with 2.0 mils
of the optical axis, parallax at the boresight cross shall not exceed
0.25 mil between 125 yards and infinity.
3.9 Operability. - The running torque required to rotate the diopter
adjustment and the reticle knob shall not exceed the values specified in
Table I at temperatures indicated when subjected to the requirements of
3.4.2.
TABLE I - OPERABILITY
Plus
Minus
Plus
Control
60 to 90F
40F
150F
Diopter Adjustment
5 inch lbs
9 inch lbs
5 inch lbs
Reticle Slide Adjustment 4 inch lbs
8 inch lbs
4 inch lbs
3.10 Illumination. - The reticle markings shall be visible in ambient
light conditions ranging from dusk into night. When required, the use of
a mask wiht a 3/4" aperture, located on the entrance window, will be per-
mitted to meet this requirement.
4
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