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MIL-T-50782(MU)
3.7.2 Image tilt. - When checked at 1600 mil increments in azimuth
through two full revolutions in each direction, the image of a vertical
target line shall be vertical within two degrees of arc. This require-
ment shall also be met with the elbow assembly positioned against each
of the swing stops.
3.7.3 Parallelism of reticle and image. - The vertical reticle
line shall be parallel to the image of a vertical target line within
30 minutes of arc at the position established in paragraph 3.6.
3.7.4 Eyepiece focus. - The eyepiece focus of the reticle image
shall be fixed between the limits of -0.50 and -1.0 diopter.
3.7.5 Patallax. - Parallax in the center of the field shall not
exceed 0.1 mil when viewing a target at 80 meters 1.0 meter.
3.7.6 Resolution. - Resolution on the optical axis shall be 10.0
seconds of arc or less when using an auxiliary telescope of at least
-
3 power having an entrance pupil of at least 0.4 inch. Resolution
shall consist of detectable line structure and proper line count in
all four meridians. Total spread in focus shift between meridians
shall not exceed 0.25 diopters as measured at the telescope eyepiece.
3.7.7 Reticle accuracy. - The angular separation between the two
40 mil graduations on the horizontal axis shall be 80 mils plus or
minus 0.5 mil.
3.7.8 Image wander. - The wander of the reticle image measured
at the eyepiece shall not exceed two degrees in diameter for two (2)
complete revolutions of the head assembly. In addition, all reticle
graduations shall be visible throughout the revolutions of the head.
This requirement shall also be met with the elbow assembly positioned
against each of the swing stops.
3.8 Performance.
3.8.1 Elevation mechanism.
3.8.1.1 Excursion range. - Rotation of the elevation knob shall
cause the line of sight to elevate and depress a minimum of 300 mils
from the position specified in 3.6(d).
3.8.1.2 Plumb travel. - Starting with the line of sight in
coincidence with a vertical target line at zero elevation, the line
of sight shall not deviate by more than 0.5 mil (total spread 1.0
mil ) under the following conditions:
(a) When the line of sight is elevated 300 mils from zero
elevation.
(b) When the line of sight is depressed 300 mils from
zero elevation.
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