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|  MIL-T-46324D(MU)
3.5.3 Sealing. - The telescope shall show no evidence of leakage in
excess of 0.2 psig when subjected to an internal pressure of 5 0.10
psig for a period of 2 hours using dry nitrogen having a dew point at
least as low as -250F.
3.5.3.1 Condensation (low temperature). - When viewed through the
eyepiece and objective ends of the telescope, there shall be no evidence
of condensation at room temperature (60 to 90F) immediately upon thermal
stabilization, subsequent to being subjected to the -80F and prior to
the +1600F requirement of 3.5.1.
3.5.4 Cleanliness. - The telescope shall meet the cleanliness require-
ments of MIL-0-13830. When viewed through the eyepiece, dirt shall not
exceed the following limitations of dirt, quantity, and size (see 6.3
size equivalent).
a. Inner zone (100 mils diameter). - The maximum size of any one
particle of dirt or foreign material shall not exceed the area equivalent
to a size 5 dig. There shall be no more than 6 particles of dirt. Three
particles may be as large as a size 5 dig. Three particles shall not ex-
ceed a size 1 dig. Any particles smaller than a size 1/4 dig shall not
be counted.
b. Outer zone (limited to clear aperture of reticle). - The maxi-
mum size of any one particle of dirt or foreign material shall not exceed
the area equivalent to a size 10 dig. Three particles may be as large as
a size 10 dig. Smaller sizes may be more in number, but their combined
area shall not exceed that of 3 size 10 digs, which is maximum dirt per-
mitted. Any particles smaller than a size 1/4 dig shall not be counted.
c. Dirt separation. - The separation between each dirt particle
or foreign matter shall be at least 10 roils for both zones.
d. Glass surfaces. - All glass surfaces shall be free of conden-
sation, or stains resulting from condensation, when viewed through the
objective and eyepiece ends of the telescope.
3.6 Accuracy.
3.6.1 Collimation. - The optical axis of the telescope shall be in
coincidence with the geometric axis within 0.50 mil when the telescope is
rotated 3200 mils (90 to the left and 90 to the right from a vertical
position of the eyepiece) about the geometric axis as defined by the
exterior mounting surface of the objective tube of the telescope.
3.6.2 Parallax. - Parallax at the optical axis shall not exceed 0.1
mil when viewing a target between 40 meters and infinity.
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